Podcasts about Limnology

Send us a textProfessor Carlos Duarte, Ph.D. is Distinguished Professor, Marine Science, and Executive Director, Coral Research & Development Accelerator Platform ( CORDAP - https://cordap.org/ ), Biological and Environmental Science and Engineering Division, King Abdullah University of Science and Technology ( KAUST - https://www.kaust.edu.sa/en/study/faculty/carlos-duarte ), in Saudi Arabia, as well as Chief Scientist of Oceans2050, OceanUS, and E1Series.  Prior to these roles Professor Duarte was Research Professor with the Spanish National Research Council (CSIC) and Director of the Oceans Institute at The University of Western Australia. He also holds honorary positions at the Arctic Research Center in Aarhus University, Denmark and the Oceans Institute at The University of Western Australia. Professor Duarte's research focuses on understanding the effects of global change in marine ecosystems and developing nature-based solutions to global challenges, including climate change, and developing evidence-based strategies to rebuild the abundance of marine life by 2050.  Building on his research showing mangroves, seagrasses and salt-marshes to be globally-relevant carbon sinks, Professor Duarte developed, working with different UN agencies, the concept of Blue Carbon, as a nature-based solution to climate change, which has catalyzed their global conservation and restoration.  For the past years, Professor Duarte has also lead efforts to quantify the global role and importance of algal forests.  He has conducted research across all continents and oceans, spanning most of the marine ecosystem types, from inland to near-shore and the deep sea and from microbes to whales, and has a particular focus on the role of seaweed aquaculture as a sustainable solution for multiple challenges. Professor Duarte led the Malaspina 2010 Expedition, including over 700 scientists from 38 institutions from across 18 nations, that sailed the world's oceans to examine the impacts of global change on ocean ecosystems and explore deep-sea biodiversity. Professor Duarte served as President of the American Society of Limnology and Oceanography between 2007 and 2010. He has published more than 950 scientific papers a and has been ranked within the top 1% Highly-Cited Scientist by Thompson Reuters in all assessments of this rank, as was ranked as the top marine biologist in the world, and recently, the 12th most influential climate scientist in the world (Reuters). He has received many honors, including the G. Evelyn Hutchinson Award from the American Society of Limnology and Oceanography in 2001, the National Science Award of Spain (2007), and the I. Vernadsky Medal of the European Geophysical Union. the Prix d'Excellence by the International Council for the Exploration of the Seas (ICES, 2011), the Carlo Heip award for excellent in Marine Biodiversity (2018), and the Ramon Margalef Ecology Award (2019), and the BBVA Foundation Frontiers of Knowledge Award in Ecology and Conservation Biology (2020).  Professor Duarte earned a bachelor's degree in environmental biology from Autonomous University of Madrid, Spain  and obtained a Ph.D. in limnology from McGill University#Corals #Oceans #Seagrass #BlueCarbon #BlueEconomy #Mangroves #Reefs #KAUST #ClimateChange #CarbonCapture #CarlosDuarte #Aquaculture #SaltwaterAgriculture #KingAbdullahUniversityOfScienceAndTechnology #KSA #SaudiArabia #RedSea #Bioprospecting #Genomics #CraigVenter #CarbonSink #Environment #Biodiversity #COP16 #Limnology  #ProgressPotentialAndPossibilities #IraPastor #Podcast #Podcaster #ViralPodcast  #STEM #Innovation #Technology #Science #ResearchSupport the show

In this episode, the host shares insights on preparing for a career in wildlife biology, drawing from personal experiences and discussions with his daughter. He also mentions feedback received from listeners and a suggestion from a colleague about enhancing resumes with additional experiences beyond courses and internships. Follow a career in conservation: https://www.conservation-careers.com/online-training/ Use the code SUFB to get 33% off courses and the careers program.   Do you want to join my Ocean Community? Sign Up for Updates on the process: www.speakupforblue.com/oceanapp   Sign up for our Newsletter: http://www.speakupforblue.com/newsletter   Facebook Group: https://bit.ly/3NmYvsI Connect with Speak Up For Blue: Website: https://bit.ly/3fOF3Wf Instagram: https://bit.ly/3rIaJSG TikTok: https://www.tiktok.com/@speakupforblue Twitter: https://bit.ly/3rHZxpc YouTube: www.speakupforblue.com/youtube   Building a Strong Resume and Network in Marine Science and Conservation Engaging in extracurricular activities and joining societies can significantly boost your resume and expand your network within the marine science and conservation sector. As discussed in the podcast episode, these activities go beyond traditional coursework and internships, showcasing your dedication and passion for the field. 1. Enhancing Your Resume: Extracurricular Activities: Involvement in activities like volunteering, serving on a non-profit organization's board of directors, or taking on leadership roles demonstrates your commitment to marine conservation beyond academic requirements. Networking Opportunities: Being part of societies such as the Society of Conservation Biology, Estuarine Society, or Ecological Society of America provides chances to connect with professionals, researchers, and potential employers in the field. 2. Building a Strong Network: Conferences and Events: Attending conferences and events organized by these societies allows you to network with peers, professors, and industry experts, potentially leading to collaborations, job opportunities, and mentorship. Committee Involvement: Volunteering for committees within these societies, such as funding committees or social committees, not only aids in organizing events but also exposes you to a diverse network of individuals within the marine science community. 3. Career Advancement: Recommendations and Referrals: Active participation in extracurricular activities and societies can result in strong recommendations and referrals from mentors, professors, and colleagues, which can be invaluable when applying for jobs or graduate programs. Exploring Career Paths: Through networking and involvement in various activities, you can gain insights into different career paths within marine science and conservation, helping you narrow down your interests and goals. In conclusion, by actively engaging in extracurricular activities and societies related to marine science and conservation, you not only strengthen your resume but also expand your professional network, opening doors to new opportunities and career advancement in the field. Gaining Experience and Making Connections in Marine Science and Conservation Volunteering in labs, participating in conferences, and joining scientific societies are essential steps for individuals looking to gain valuable experience and make connections in the field of marine science and conservation. Volunteering in Labs: Volunteering in labs provides hands-on experience and exposure to real-world research and conservation efforts. By volunteering in labs, individuals can learn about different research methodologies, data collection techniques, and lab protocols. It offers the opportunity to work closely with professors, graduate students, and lab managers, allowing for mentorship and guidance in the field. Volunteering in labs can help individuals determine their specific interests within marine science and conservation, whether it be aquaculture, behavioral studies, or fieldwork. Participating in Conferences: Conferences serve as networking opportunities where individuals can meet professionals, researchers, and potential mentors in the field. Attending conferences allows individuals to present their work, exchange ideas, and collaborate with others in the marine science and conservation community. Conferences provide insights into the latest research, trends, and challenges in the field, helping individuals stay informed and connected. Participating in conference planning committees or workgroups can further enhance networking opportunities and involvement in the scientific community. Joining Scientific Societies: Joining scientific societies such as the Society of Conservation Biology, American Society of Limnology and Oceanography, or Ecological Society of America offers numerous benefits. Scientific societies provide a platform for individuals to engage with like-minded professionals, researchers, and conservationists. Membership in scientific societies offers access to resources, publications, and opportunities for professional development and collaboration. Involvement in scientific societies can lead to leadership roles, participation in conferences, and exposure to diverse research areas within marine science and conservation. In conclusion, volunteering in labs, participating in conferences, and joining scientific societies are proactive steps that individuals can take to gain experience, build connections, and advance their careers in the dynamic field of marine science and conservation. These opportunities not only contribute to personal and professional growth but also play a crucial role in driving positive change and conservation efforts for our oceans and marine ecosystems. Building relationships with mentors, professors, and colleagues is crucial for job opportunities and career advancement in marine science and conservation. As highlighted in the podcast episode, networking within scientific and conservation societies, volunteering for committees, and participating in conferences are excellent ways to connect with professionals in the field. By actively engaging with mentors and colleagues, individuals can gain valuable insights, advice, and potential job referrals. The episode emphasized the importance of participating in extracurricular activities, such as volunteering in labs, joining societies like the Society of Conservation Biology or the Ecological Society of America, and serving on boards of non-profit organizations. These experiences not only demonstrate a commitment to the field but also provide opportunities to collaborate with experts and establish meaningful connections. Moreover, the podcast discussed how mentors like Dr. David Ebert often recommend students for job opportunities based on their work ethic and dedication. By building strong relationships with mentors and professors, individuals can access a network of professionals who may offer guidance, references, and even potential job placements. In conclusion, fostering relationships with mentors, professors, and colleagues is essential for career growth in marine science and conservation. These connections can lead to job opportunities, collaborations, and valuable support throughout one's professional journey. By actively engaging with the marine science community and demonstrating a passion for the field, individuals can enhance their career prospects and contribute meaningfully to ocean conservation efforts.

This week on Outdoor Journal Radio, Ang and Pete are joined by Zach Feiner, Fisheries ecologist for the Wisconsin Department of Natural Resources and UW-Madison Center for Limnology, to talk about the danger our current weather patterns are posing our walleye.First, however, a bit of housekeeping was in order. Topics discussed included: making up titles; our new shirts; Pete's pro bass hookset; what is in Ang's coffee cup;  marketing tips from Steve; bears waking up from hibernation; Pete's pet bears; and how often you should change your fishing line.With those matters out of the way, Zach joins the show! Topics discussed included: historical weather events; how warm weather impacts the walleye spawn; shrinking fish; low water starving fry; whether walleye will have time to evolve; when stocking becomes a necessary solution; Wisconsin walleye strains; walleye being the new Atlantic Salmon; what anglers can do; and much more!To never miss an episode of Outdoor Journal Radio, be sure to like, subscribe, and leave a review on your favourite podcast app!More from Angelo and Pete:► WEBSITE► FACEBOOK► INSTAGRAM► YOUTUBEThank you to today's sponsors!Invasive Species Centre - Protecting Canada's land and water from invasive speciesColeman Canada - The Outside is Calling, Answer the Call.

We've got another newcomer for you here on 4Play this week. Asha Ouseph joins Carmela to see if she can make the connections and come back again next week! Here are today's clues:  1. jam, kosher, relish, recently popular "ball".  2. popular pivoter, discount clothing chain, Antarctic explorer, American flagship upholsterer?.  3. Brown, Gang, Taylor, Blunt.  4. Limnology in a sense?, Hall of Fame Massachusetts city, Guiding Light Locale, Dusty. 

Die Themen in den Wissensnachrichten: +++ Roboter verleiten zu "Sozialem Faulenzen" +++ Unfälle mit Fahrrädern verletzten vor allem zu Fuß Gehende +++ Australische Vogelmüttern singen ihren Eiern was vor +++**********Weiterführende Quellen zu dieser Folge:Lean back or lean in? exploring social loafing in human–robot teams, Frontiers in Robotics and AI, 18.10.2023High-resolution maps show that rubber causes substantial deforestation, Nature, 18.10.2023Stress auf dem Gehweg: Studie zeigt Probleme zwischen Radfahrern und Fußgängern, GDV Unfallforschung der Versicherer, 19.10.2023Nestling begging calls resemble maternal vocal signatures when mothers call slowly to embryos, The American NaturalistA Tectonic Origin for the Largest Marsquake Observed by InSight, Geophysical Research Letters, 17.10.2023Hydrology drives export and composition of carbon in a pristine tropical river, Limnology and Oceanography, 13.10.2023**********Ihr könnt uns auch auf diesen Kanälen folgen: Tiktok und Instagram.

Live from the iconic Memorial Union Terrace in Madison, Wisconsin, Charlie interviews a panel of environmental experts about the phosphorus levels in our lakes. The panel includes director of UW-Madison's Center for Limnology, Jake Vander Zanden, professor of Grassland Ecology from the Department of Agronomy, Randy Jackson, and return Cripescast guest and author, Dan Egan. They answer questions from the crowd while having an open discussion about key sources of phosphorus, its implications on everyday life, and what we can do to help clean our lakes.  To get involved, head to cleanwisconsin.org or grasslandag.org and check out the Wisconsin Idea wisc.edu/wisconsin-idea/. Also be sure to pick up a copy of Dan's latest book “The Devil's Element: Phosphorus and a World out of Balance” anywhere you get your books.  Find us on all platforms @cripescast and @charlieberens and at cripescast.com. Check out our behind the scenes footage at Patreon.com/charlieberens.

Click to listen to episode (5:03).Sections below are the following:Transcript of AudioAudio Notes and AcknowledgmentsImagesExtra InformationSourcesRelated Water Radio EpisodesFor Virginia Teachers (Relevant SOLs, etc.)Unless otherwise noted, all Web addresses mentioned were functional as of 9-1-23. TRANSCRIPT OF AUDIO From the Cumberland Gap to the Atlantic Ocean, this is Virginia Water Radio for the weeks of September 4 and September 11, 2023. MUSIC – ~22 sec – Lyrics: “Wake up in the morning and get to work; wake up in the morning and get to work.  Got a lot of work to do, gonna go do it, gotta get to it.” That's part of “Get to Work,” by the Harrisionburg- and Rockingham County, Va.-based band, The Steel Wheels, from their 2019 album, “Over the Trees.”  It sets the stage for a water-and-work quiz game, honoring Labor Day by exploring some water-related jobs.  In this game, I'll read 10 short samples of people describing their work connected to water; you'll have a couple of seconds of river sounds to guess the job, then I'll tell you the answer.  Let's get to it! No. 1.  I manage places where marine or freshwater creatures are grown for food, restoration, or other purposes. [RIVER SOUNDS - ~2 SEC]  That's an aquaculturist. No. 2.  I ply big rivers on large, flat vessels full of coal, grains, and other goods.  [RIVER SOUNDS - ~2 SEC] That's a crew member on a river barge. No. 3.  I'm a scientist who studies fish.  [RIVER SOUNDS - ~2 SEC]  That's an ichthyologist. No. 4.  I'm a scientist who studies inland waters, both fresh and salty.  [RIVER SOUNDS - ~2 SEC]  That's a limnologist.  No. 5.  I respond to often dangerous emergencies with the aid of trucks, hoses, pumps, and other equipment.  [RIVER SOUNDS - ~2 SEC]  That's a firefighter. No. 6.  I use filters, chemicals, and tests to treat water going from sources to customers.  [RIVER SOUNDS - ~2 SEC]  That a water-supply plant worker. No. 7.  I use filters, chemicals, and tests to treat used water and send it back to water sources.  [RIVER SOUNDS - ~2 SEC]  That's a wastewater-treatment plant worker. No. 8.  I board huge ships in open waters, then guide the ships safely into port.  [RIVER SOUNDS - ~2 SEC]  That's a harbor pilot. No. 9.  I work to ensure safe, accessible, and effective use of a water-recreation facility.  [RIVER SOUNDS - ~2 SEC]  That's a swimming pool manager, lifeguard, or water exercise instructor. And No. 10.  I use powerful drills to provide access to groundwater.  [RIVER SOUNDS - ~2 SEC]  That's a water-well contractor. Other water-related jobs include boat building, farming, public health, managing lakes and dams, managing watersheds, identifying wetlands, and lots more.  As Labor Day comes and goes, here's a big thank you to people who work to provide, manage, navigate, protect, and teach and learn about our common wealth of water.   Thanks also to The Steel Wheels for permission to use part of “Get to Work.”  We close with some more music, this time by renowned musician and former Charlottesville, Virginia, resident John McCutcheon.  From his 1998 album “Four Seasons: Autumnsongs,” here's about 35 seconds of “Labor Day.” MUSIC – ~36 sec – Lyrics: “Labor Day, Labor Day, September or the first of May.  To all who work this world we say, ‘Happy Labor Day.'” SHIP'S BELL Virginia Water Radio is produced by the Virginia Water Resources Research Center, part of Virginia Tech's College of Natural Resources and Environment.  For more Virginia water sounds, music, or information, visit us online at virginiawaterradio.org, or call the Water Center at (540) 231-5624.  Thanks to Ben Cosgrove for his version of “Shenandoah” to open and close this episode.  In Blacksburg, I'm Alan Raflo, thanking you for listening, and wishing you health, wisdom, and good water. AUDIO NOTES AND ACKNOWLEDGEMENTS The river sounds heard in this episode were recorded by Virginia Water Radio beside the New River at Radford, Va., on October 6, 2013. “Get to Work,” from the 2019 album, “Over the Trees,” is copyright by The Steel Wheels, used with permission.  More information about The Steel Wheels is available online at http://www.thesteelwheels.com/.  This music was used previously by Virginia Water Radio in Episode 558, 1-4-21. “Labor Day,” from the 1998 album “Four Seasons: Autumnsongs,” on Rounder Records, is copyright by John McCutcheon/Appalsongs and Si Kahn/Joe Hill Music, used with permission of John McCutcheon.  More information about John McCutcheon is available online at http://www.folkmusic.com/.  Thanks to John Plunkett of Appalseed Productions for his help in acquiring permission to use this music.  More information about Appalseed Productions is available online at https://appalseed-productions-2.square.site/. Click here if you'd like to hear the full version (2 min./22 sec.) of the “Shenandoah” arrangement/performance by Ben Cosgrove that opens and closes this episode.  More information about Mr. Cosgrove is available online at http://www.bencosgrove.com. IMAGES (Except as otherwise noted, photographs are by Virginia Water Radio.) A Virginia Tech worker testing fire-hyrdrant pressure on the university campus in Blacksburg, March 10, 2017.A well-drilling rig at a Montgomery County, Virginia, residential project, June 20, 2014.A barge transporting stone on the Ohio River at Huntington, West Virginia, November 6, 2011.A commercial ship on the Chesapeake Bay as viewed from Kent Island, Maryland, September 22, 2010.EXTRA INFORMATION ABOUT LABOR DAY The following information is from U.S. Department of Labor, “History of Labor Day,” online at https://www.dol.gov/general/laborday/history.  “Before it was a federal holiday, Labor Day was recognized by labor activists and individual states.  After municipal ordinances were passed in 1885 and 1886, a movement developed to secure state legislation.  New York was the first state to introduce a bill, but Oregon was the first to pass a law recognizing Labor Day, on February 21, 1887.  During 1887, four more states – Colorado, Massachusetts, New Jersey and New York – passed laws creating a Labor Day holiday. By the end of the decade Connecticut, Nebraska and Pennsylvania had followed suit.  By 1894, 23 more states had adopted the holiday, and on June 28, 1894, Congress passed an act making the first Monday in September of each year a legal holiday.” SOURCES USED FOR AUDIO AND OFFERING MORE INFORMATION American Society of Limnology and Oceanography, “What is Limnology?”  Online at https://www.aslo.org/what-is-aquatic-science/what-is-limnology/. Encyclopedia Britannica, “May Day,” by Meg Matthais, online at https://www.britannica.com/topic/May-Day-international-observance. Fire Safety USA, “All [Product] Categories,” online at https://firesafetyusa.com/collections/all-products. National Oceanic and Atmospheric Administration/National Ocean Service, “What is aquaculture?”  Online at this link. NPR, “Harbor Pilots Reap High Rewards for Dangerous Job,” by Gloria Hillard, March 21, 2012. NPR, “What is May Day?”  For the most part, the opposite of capitalism,” by Emma Bowman, May 1, 2023. Tennessee Valley Authority, “Commodities Shipped on the River,” online at https://www.tva.com/environment/managing-the-river/commodities-shipped-on-the-river. University of New Mexico, “Position Classification Description: Aquatics Manager,” online at https://jobdescriptions.unm.edu/detail.php?v&id=I6001. U.S. Department of Labor, “History of Labor Day,” online at https://www.dol.gov/general/laborday/history. U.S. Environmental Protection Agency, “Learn About Private Water Wells,” online at https://www.epa.gov/privatewells/learn-about-private-water-wells. Virginia Cooperative Extension/Virginia Household Water Quality Program, “Wellcheck Contractor List,” online at https://www.wellwater.bse.vt.edu/wellcheck-contractor-list.php. Karen Zraik, “What is Labor Day?  A History of the Workers' Holiday,” New York Times, September 4, 2023 (first published in 2018).RELATED VIRGINIA WATER RADIO EPISODES All Water Radio episodes are listed by category at the Index link above (http://www.virginiawaterradio.org/p/index.html).  See particularly the “Overall Importance of Water” subject category. Following are links to some other episodes on Labor Day or water-related labor.Episode 279, 8-24-15 – Oysters, Nitrogen, and the Chesapeake Bay. Episode 378, 7-24-17 – The Complicated Challenge of Cleaner Water. Episode 436, 9-3-18 – Labor Day, “Sandy Boys,” and the Big Sandy River. Episode 578, 5-24-21 – Water Well Construction is an Ancient and Modern Human Practice. Episode 635, 8-29-22 – A Fishing Focus for Labor Day, Featuring the Northern Neck Chantey Singers FOR VIRGINIA TEACHERS – RELATED STANDARDS OF LEARNING (SOLs) AND OTHER INFORMATION Following are some Virginia Standards of Learning (SOLs) that may be supported by this episode's audio/transcript, sources, or other information included in this post. 2020 Music SOLs SOLs at various grade levels that call for “examining the relationship of music to the other fine arts and other fields of knowledge.” 2018 Science SOLs Grades K-5: Earth and Space Systems3.7 – There is a water cycle and water is important to life on Earth. Grades K-5: Earth Resources3.8 – Natural events and humans influence ecosystems.4.8 – Virginia has important natural resources. Grade 66.6 – Water has unique physical properties and has a role in the natural and human-made environment.6.8 – Land and water have roles in watershed systems.6.9 – Humans impact the environment and individuals can influence public policy decisions related to energy and the environment. Earth ScienceES.6 – Resource use is complex.ES.8 – Freshwater resources influence and are influenced by geologic processes and human activity.ES.10 – Oceans are complex, dynamic systems subject to long- and short-term variations.

Meet Javier Pardo Díaz is a thesis student at the Biology School with an orientation in Marine Biology and Limnology at the University of Panama. He is currently working at the Smithsonian Tropical Research Institute on long-term projects on water quality monitoring and mangrove restoration in the Bay of Panama. Since the beginning of his career, he has been part of different NGOs such as Sustainable Ocean Alliance Panama, Reef 2 Reef Foundation, and the Ghost Net Removal project with the Panama Aquatic Resources Authority, among others, and is an active volunteer for many other foundations that they seek a more sustainable future for all. Javier was one of the 77 young people selected to participate in the Youth Leadership Summit and the Our Ocean 2023 conference, he also participated as a delegate to CITES COP 19 in 2022, both held in the Republic of Panama. In addition to being part of research projects, he works as an underwater cameraman focused on environmental education, educating the civil community, young students, children, and adults. In this Episode, Javier and I take a deep dive into the importance of coastal ecosystems in Panama and some of the issues the country faces when it comes to marine conservation. If you are interested in learning more about Javier be sure to follow him on Instagram. Be sure to also follow @ecovybz on all platforms and if you would like to be featured on the podcast shoot me an email ecovybz@gmail.com and lets create some magic!

"Creo que hay esperanza ante los problemas medioambientales a los que nos enfrentamos, porque ya tenemos la experiencia del pasado, casos de éxito en los que se corrigieron errores. Pero es fundamental que se escuche a los científicos, que se haga cuanto antes, porque ya vamos tarde". Con esta advertencia, la oceanógrafa Cristina Romera Castillo lanza un mensaje de esperanza sobre los retos que afronta el planeta y recoge en su libro 'AntropOcéano'. Licenciada en Química y doctora en Ciencias del Mar, trabaja en el Instituto de Ciencias del Mar del Consejo Superior de Investigaciones Científicas (CSIC). Allí se ha especializado en el análisis del ciclo del carbono oceánico, la materia orgánica disuelta en el océano y sus interacciones con los microorganismos, y la cuantificación del impacto de los plásticos en los microbios marinos, trabajos por los que ha sido galardonada con premios como For Women in Science 2019 de L'Oreal-UNESCO; el Raymond L. Lindeman Award 2020, de la Association for the Sciences of Limnology and  Oceanography (ASLO); o el International Rising Talents 2020, de L'Oreal-UNESCO. "El principal problema de los plásticos, aparte del daño que están haciendo a los organismos de los océanos, también está en la salud humana, porque estos plásticos son ingeridos por organismos marinos, se transfieren en la cadena alimentaria y llegan hasta a los peces que nosotros consumimos. Es un daño medioambiental que nos está llegando a nosotros con un efecto bumerán", concluye.

Dr. Sapna Sharma is an Associate Professor in Biology at York University. Sapna studies the effects of climate change, invasive species, and pollution on lakes. She is investigating how these effects are manifested through water quality, fish populations, water temperatures, and lake ice. With a young, a lot of Sapna's time away from science is spent with her family. It has been fun to go to music classes and swimming classes together. She received her PhD in Ecology and evolution from the University of Toronto and completed postdoctoral fellowships at the University of Montreal and the Center for Limnology at the University of Wisconsin-Madison. She served on the faculty at Loyola before joining the faculty at York where she is today. Sapna is also founder of a science outreach program at York University for refugee children called SEEDS. She is with us today to tell us all about her journey through life and science.


Miss Wisconsin, recently crowned Miss America, talks about the world of pageantry and her advocacy goals. Then, we discuss new trout research with a scientist at the UW-Madison Center for Limnology.

Ed came to Aquascape in 1993 as a construction laborer, but a little creativity and a positive outlook on life and business helped catapult Ed to the position of Vice President of Field Research and Contractor Development. For more than a decade, Ed has successfully built hundreds of custom-designed ponds from small backyard water gardens to large lakes and commercial water features. He holds a B.S. in Zoology, with an emphasis in Limnology, and concentrated his master's studies in Marine Biology.

How do we keep an eye on salinization of our freshwater streams and rivers? In this episode, I feature a paper by Kaushal and colleagues who developed a five stage scale to track the progression of the damage that salinization from winter road salts and other pollutants cause in our rivers.   Full citation: Kaushal, S. S., Mayer, P. M., Likens, G. E., Reimer, J. E., Maas, C. M., Rippy, M. A., ... & Becker, W. D. (2022). Five state factors control progressive stages of freshwater salinization syndrome. Limnology and Oceanography Letters.

Dr. Josh Thienpont a paleolimnologist from York University's Faculty of Environmental and Urban Change. He studies inland aquatic ecosystems in the Arctic to understand what the distant past of lakes and streams can tell us about how climate change is affecting the Arctic. His work is crucial for understanding the effects of humanity on the very waterways on which human life depends. Hosted and produced by Cameron Graham, Professor of Accounting at York University. Podcast or Perish is produced with the support of York University. Visit our website at podcastorperish.ca.

This week on PNM, Emily and Serena have a new installment of science news, where we round up some intriguing science news from around the world and in our neighborhood, […] The post Sweat, limnology and happiness, mysterious webs: Science News August 2... appeared first on WORT-FM 89.9.

You've probably noticed a coating of salt on your car or truck. But undercarriages aren't the only place road salt accumulates during the winter. University of Wisconsin researchers are seeing more and more salt in the Great Lakes, so much that their ecosystems are starting to change.  GUEST:  Rob Mooney, postdoctoral researcher at the University of Wisconsin-Madison Center for Limnology  ---- Looking for more conversations from Stateside? Right this way. If you like what you hear on the pod, consider supporting our work. Stateside's theme music is by 14KT. Additional music by Blue Dot Sessions. See omnystudio.com/listener for privacy information.

For this episode I have the privilege of interviewing Dr. Soren Brothers - the inaugural "Allan and Helaine Shiff Curator of Climate Change at the ROM @romtoronto (Royal Ontario Museum, Toronto). As far as the ROM can tell, this position is the first of its kind, and today Soren shares some of the potential he sees in this position, some of his goals and aspirations, and the careful balance of sharing this important information with the seriousness it calls for, while leaning into optimism and highlighting ways forward and progress where they can be found.About Soren (https://www.rom.on.ca/en/collections-research/rom-staff/soren-brothers)Dr. Soren Brothers is the Allan and Helaine Shiff Curator of Climate Change at the Royal Ontario Museum, Toronto. He is also an Assistant Professor at the Department of Ecology and Evolutionary Biology at the University of Toronto. Soren’s research examines the effects of climate change on lakes, and how changes in aquatic systems can influence their greenhouse gas emissions to the atmosphere. More broadly, he is interested in understanding how feedback loops and the transdisciplinary study of lakes can help us better understand and predict global tipping points that may accelerate anthropogenic climate change.Born in Mississauga and raised in Toronto, Soren has worked on lakes in a diverse array of environments around the world, including the Nunavut tundra, Quebec’s boreal forests, and the Great Lakes. He is leading a Global Lakes Ecological Observatory Network initiative to improve understanding of the widespread greenhouse gas impacts of desiccation. He is also passionate about science communication and community outreach and organized a climate change workshop at the United Nations Civil Society Conference in 2019. Before beginning at the ROM in 2021 he was an Assistant Professor of Limnology at Utah State University, and a CREATE program manager and postdoctoral fellow at the University of Guelph, focusing on multiple stressors and cumulative effects in the Great Lakes.Research Group Website: sorenbrothers.weebly.comPhoto credits: © 2021 Saty Namvar and Pratha SamyrajahThis interview was originally recorded on Dec. 8th, 2021 Subscribe at bridgingthesocialdistance.substack.com

If you live in Madison or Wisconsin or the Upper Midwest, you are probably a limnophile (you love lakes). Kicking off the Fall 2021 pledge drive, limnologist / biologist guest Gretchen Gerrish joins host Patrick Sajbel to talk about research at UW's Trout Lake Station in Boulder Junction. As the Station approaches a century of […] The post Killer Lakes and Limnology Legends du Nord appeared first on WORT 89.9 FM.

In this week's episode, the Pond University team talks with Assistant Professor Jake Hosen from Purdue University. Jake is an aquatic scientist and limnologist with expertise in building sensors to measure water quality parameters. Jake talks to us about some of the basics of water chemistry and how things like salinity and pH can influence pond management. He also talks to us about the exciting technology that he is currently developing, including the potential for digital sensors for pond monitoring and management.  We hope you enjoy this episode! Also, please consider taking our anonymous listener survey so that we can improve the podcast and include topics that you are interested in.   Anonymous Listener Survey: https://purdue.ca1.qualtrics.com/jfe/form/SV_1IhSN3DPQpowBPU Jake's Profile Page at Purdue University: https://ag.purdue.edu/fnr/Pages/Profile.aspx?strAlias=jhosen&intDirDeptID=15 Jake's Website: http://www.ecosystemscience.io/ Streamlines Podcast: https://extension.sdstate.edu/tags/streamlines-podcast Making Waves Podcast: https://freshwater-science.org/education-outreach/making-waves Pond and wildlife management website: https://extension.purdue.edu/pondwildlife/ Purdue's Plant and Pest Diagnostic Laboratory: https://ag.purdue.edu/btny/ppdl/Pages/default.aspx Mitch's profile page: https://ag.purdue.edu/fnr/Pages/Profile.aspx?strAlias=mzischke&intDirDeptID=15 Mitch's twitter: https://twitter.com/TheAussieWahoo Megan's profile page: https://ag.purdue.edu/fnr/Pages/Profile.aspx?strAlias=mlgunn&intDirDeptID=15 Megan's twitter: https://twitter.com/_TFFP Natural Resources University website: https://naturalresourcesuniversity.libsyn.com/ Natural Resources University YouTube Channel: https://www.youtube.com/channel/UCZ-uehW5nyQ8uZMDSHG_low Purdue's Department of Forestry and Natural Resources website: https://ag.purdue.edu/fnr/Pages/default.aspx Illinois-Indiana Sea Grant website: https://iiseagrant.org/ Contact us! https://extension.purdue.edu/pondwildlife/contact-us/

Back in 1946, the Wisconsin Conservation Commission had the idea to set aside an area made up of five lakes in Vilas County for fisheries research.  Using special free permits and mandatory reports from all anglers fishing the lakes, they've gained a lot of knowledge and tested the impact of various fishing regulations on those fishing populations.  We're celebrating the 75th anniversary of this groundbreaking research area. To learn more, we spoke with the facility's lead reasearcher, Greg Sass. Listen in as he talks about the way the data is used, how it has evolved over the years and what the hopes to see over its next 25 years.Learn more about research at the Wisconsin DNR: https://dnr.wisconsin.gov/topic/Research--------------------------------------TRANSCRIPTSARAH HOYE: [00:00:00] From the Wisconsin DNR, this is Wild Wisconsin. Bringing you inside voices on Wisconsin's outdoors.KATIE GRANT: [00:00:16] Welcome back to another episode of Wild Wisconsin "Off the Record". I'm your host, Katie Grant. After World War II, fishing and resort-based tourism was beginning to boom in northern Wisconsin, specifically near Boulder Junction. At the same time, the Wisconsin Conservation Commission, which is now known as the DNR recognized a need to better understand the fish population in the area. In 1946, they established what was then known as the Five Lakes Research Project across well, five lakes in the area. It utilized special licenses and reports from all anglers on these lakes to gain data and test the impact of various regulations and stocking practices.Flash forward to 2021. And we are celebrating the 75th anniversary of this groundbreaking research area. Over the years over 243,000 anglers have fished the shores of just Escanaba Lake accounting for over 1 million hours of angling effort. It's now known as the Northern Highland Fisheries Research Area.Greg Sass has been the lead researcher there for half a decade. Sit back and listen in as we talk with him about how the research here is used, how it's evolved over the years and what he hopes to see over its next 25 years. All right. Well, welcome to the show, Greg. We are very excited to talk about the Northern Highland Fishery Area and its upcoming anniversary.But first, why don't you tell us a little bit about who you are and what it is? GREG SASS: [00:01:53] Well, thanks so much for having me, Katie. It's exciting to talk about, uh, the 75th anniversary of the Northern Highland Fishery Research Area coming up. Uh, my name is Greg Sass and I'm Fisheries Research Team Leader in Wisconsin, DNR Office of Applied Science.And my role within the agency is to lead our group of fisheries, research, scientists, biologists, and technicians to address high-priority fisheries research needs for our fisheries management program, um, and other program partners. So, um, I helped to facilitate that program. Um, I oversee and direct the Northern Highland Fishery Research Area Program. And then we work extensively, uh, with university partners and our stakeholders and tribal partners, um, as well to conduct research, to benefit the fisheries of Wisconsin and beyond. KATIE GRANT: [00:02:40] We've both mentioned the Northern Highland Fishery Area. Can you tell us a little bit about what it is and why it was established?GREG SASS: [00:02:48] Absolutely. The Northern Highland Fishery Research Area, um, was established in 1946 by the Wisconsin Conservation Commission at the time, which is now of course our Wisconsin Department of Natural Resources. Um, and at that time in northern Wisconsin, um, the tourist-based in, in fishing resort-based economy was just starting to pick up.And we didn't have a tremendous amount of information about our fisheries in this part of the state. And in listening to anglers and stakeholders, our anglers were concerned about stunting and fish populations, and stunting is basically, um, slow growth and in low size structure or a lot of small fish in a population.And in response to that, the Wisconsin Conservation Commission, uh, set aside five lakes in Vilas County, near Boulder, Boulder Junction to use as experimental fisheries research lakes. And at that time to address the question of stunting and fish populations, the default regulation on all five lakes was that there would be no size limit, no bag limit, and no closed season on any species unless specified for research purposes. And so, um, the, the lakes were set aside initially to, uh, look at a test. We're gonna allow, um, as much harvest of any size and. Um, any fish species, uh, without any closed seasons to see how those fish populations responded.Um, in addition to that, the five lakes were chosen to be representative of the lakes in the area. So, um, Vilas County has about 1300 lakes and they're, they're very diverse from clear to, uh, very tannic, meaning that the waters slightly stained brown, um, to deep, to small, to large. And so the five lakes that were selected kind of represent that gradient with Escanaba Lake, uh, being a drainage lake with fish species, diversity Pallette Nebish lake, being what we call our classic kettle lakes, where an ice block was left in the landscape from a glacier. So they're deeper and they're clear, um, and relatively unproductive. And then we have two sphagnum bog lakes, which are kind of more of our wetland lee lakes with darker water color in a Mystery Lake and Spruce Lake.KATIE GRANT: [00:04:51] Can you just kind of clarify a little bit because I don't understand necessarily the different kinds of lakes. You mentioned that the kettle lake is, is left from the glacier. Can you talk a little bit more about the other two? GREG SASS: [00:05:02] So when I talk about Escanaba Lake being a drainage lake, it means that it has an inflow and outflow.And so, uh, the inflow to Escanaba Lake comes from Spruce and Mystery Lake into the lake. And then the lake flows out to Lost Canoe Lake. And so that's what we mean with drainage lakes, uh, for Pallette Nebish when I say it was an ice block left in the landscape. These are lakes that are, um, their lake levels are dominated by precipitations and we have high levels of precipitation over time.the lake levels are going to be higher. Um, when we have a drought, like we did in the early 2000s up here, those lake levels are going to be lower because the water table is lower for precipitation. And with our sphagnum bog lakes, these are lakes that are surrounded by lowland areas, uh, with vegetation like spruce, uh, leather leaf, uh, wild cranberry.They're more of our wetlands sort of lakes. And with that wetland influence, uh, they tend to have, uh, a tea or a coffee-stained color water. And that's what I mean, when I say tannic.KATIE GRANT: [00:05:57] The main purpose of the fishery area is really research. Right? Can you tell us a little bit about some of the projects that have happened there over the years?GREG SASS: [00:06:06] Absolutely. Like I mentioned, early on the initial regulations were set up to, um, see about stunting and fish populations and how, um, high exploitation or a lack of regulation would influence that. But over time, there's been a number of different research projects that have been conducted on the lakes that have had, um, you know, pretty fair significance and importance.I would say, you know, first of all, um, we might not realize that at that time was that by, um, and I should've mentioned this previously, that we have a compulsory Creel survey on all five of these research lakes. And so any angle that wishes to fish, one of the five lakes has to check in and fill out a free permit at the Escanaba Lake Research Station prior to fishing one of the lakes, um, they go out fishing and when they get done, they're then required to check back out at the station and report certain things about their catch.Um, and so this data set has been incredibly important to us. Um, and the fact that allows us to calculate angler effort, harvest rates, catch rates. And then when, when I was getting to initially, um, in responding to the research, it also allows us to calculate an exploitation rate or how much of that fish population was removed in a given year.And so those exploitation rate research has been really important for, uh, managing fisheries in Wisconsin and beyond because it's allowed us to, um, address what might be a sustainable exploitation rate for a population. Uh, so for example, for some of our walleye regulations right now, um, Escanaba Lake showed that an average exploitation rate over time of 35% of the adult population was sustainable. And so that's the same exploitation, uh, limit reference point we use for, um, many of the lakes in northern Wisconsin right now. Um, same thing in our joint tribal, um, and angling [unintelligible] fishery, where that limit reference point exploitation rate is 27%.Um, on top of that, um, some of the other key research has been conducted we've, um, or I should say my predecessors have developed, um, indices to, um, go from a relative abundance estimate of walleye recruitment up to lake-wide densities. We've tested a number of different regulations on the lakes before they might be, um, implemented more broadly throughout the state.Uh, for example, minimum length limits on Northern pike, which occurred on Escanaba Lake. Uh, we've had various small mouth bass regulations on Nebish and on Pallette lakes. Um, that often ended up in our fisheries management toolboxes for certain purposes. And then, um, more recently, you know, a number of different studies where Escanaba Lake has served as a reference lake, um, to other whole lake studies that we've done.Um, And so those are just some of the examples of the many ways that we've used the lakes for research. And I would add on top of that, that, um, many undergraduate and graduate students have also used the lake for, um, their thesis and dissertation research, uh, covering a wide range of topics ranging from things like, um, genetic influences in small mouth bass.Nesting and reproduction to influences of regulations, um, and for many purposes. And so, uh, we also have a pretty strong presence, um, educationally with graduate students using the lakes to address research questions as well. KATIE GRANT: [00:09:19] Yeah. Lots of great information coming into you guys. So you mentioned those, uh, Angler Creel surveys where those who go out, fishing in these lakes have to come back and kind of report back. What sort of information do you get from anglers on the lake? GREG SASS: [00:09:35] When an angler comes... like I said, they have to check in or required to check in at the Escanaba Lake check station. It's right at the Escanaba Lake boat launch. Um, there.,Uh, my team of Creel clerks and research scientists, biologists, technicians there, uh, we'll check the anglers in. And when they come in, uh, they have to fill out their name and their address, um, and a bit of demographic information about gender and an age range and what lake they're going to be fishing. Um, so we give them the top copy of the permit, which says that they checked in as required and they take that with them while fishing and when they get done fishing, um, the things that we collect when they report out are things like the amount of hours they fished on the lake.Uh, what kind of bait they might've been using. Live artificial or a combination of both. We ask them what kind of methods they were using. Were they fishing from the boat? Shore? Um, were they ice fishing? And, uh, or were they just casting or trolling or motor trolling, those sorts of questions. And then we get into some other important information.Um, one is harvest information. So any fish that are harvested by the anglers, we get the length, the weight, uh, the sex of that fish. And then we also pull an aging structure from all of them. We also look for marks on the fish, and this might be a thing like a fin clip or a Floy tag or a PIT tag, uh, because this allows us to calculate an exploitation rate based on our other surveys and through an equation in doing so.And I will add the most recently, one of the interesting things that we've observed at the Northern Highland Research Area is the prevalence of catch and release, um, over time. And that more anglers are catching and releasing fish than they used to. And so this is an area where, for most species, you can harvest as many as you want.Um, but despite that we've seen major changes in the catch and release ethic, particularly towards large mouth bass, small mouth bass, and muskie over time. And so in the initial design of the Creel survey, the information collected, we will lose all that information. Cause we were only getting information from harvested fishes.Now we also asked anglers to tally, uh, within size range by species, um, fish that they might've caught and released. And so we implemented this about five years ago and it's been a very important data set for us to capture not only what's coming through the Creel survey that is harvested, but also fish that are caught and released. And so it gives us information about the size structure of the population and additional catch rate. KATIE GRANT: [00:11:51] You mentioned that, you know, this research, uh, the data we have available has been used by graduate and undergraduate students. You know, it's, it's informed things that we do here at the DNR in Wisconsin, but also beyond.Can you talk a little bit about why the data set is so important from a research perspective, both here for Wisconsin and, uh, outside of Wisconsin as well? GREG SASS: [00:12:14] Great question. I think it really lies in the strength of being such a long-time series. And so we have 75 years of continuous data, uh, from the Northern Highland Fishery Research Area.Or we will on June 20th here, um, this month, uh that's when the first permit was issued in 1946. And I'll quote, Secretary Cole here on a visit from a couple of years ago, he came up to visit the field station and said 75 years is a long time for anything. And so we agree, but in the fisheries world, having a time series of data from these five lakes for 75 years is pretty much unprecedented.Um, to my knowledge, there's only one other small field station in south central Illinois that has a data set this long and that's from Ridge lake. Um, so we're really unique. Here in Wisconsin, anywhere around the world to have this amount of continuous data to use. And long-term data, um, obviously is difficult to acquire.It takes a long time. It's expensive. It requires a lot of effort, but it's also incredibly important for being able to monitor fisheries and changes that may occur in those fisheries over time. And so I think that's one of the greatest strengths and why we've been able to do so much with this dataset and also, you know, contribute with others, with data requests that they might have to help them in their research.Um, and so I think really long-term data is something that, um, most agencies or places don't have that we do, um, that really sets us apart. And it makes us data set even more important.KATIE GRANT: [00:13:39] We'll talk a little bit more about some of the things that you've learned from the dataset, uh, in a little bit here, but one of the things that, uh, I thought was really fascinating about, uh, what you guys are able to do and what that data is used for, um, is that it, it actually helped influence the, uh, Ceded Territory of Wisconsin Walleye Management Plan.What role did the research area play in that Ceded Territory of Wisconsin Walleye Management Plan and kind of how, how has that information been used specifically for that? GREG SASS: [00:14:15] That's another great question and the Northern Highland Fishery Research Area, particularly Escanaba Lake played a, uh, a very significant role in the management plan that we're currently using in the ceded territory of Wisconsin, which is about a northern... the northern third of the state.And so, um, as a little background in, in the treaties of 1837 and 1842, um, Ojibwa Native Americans ceded, uh, two large chunks of land in northern Wisconsin to the federal government, which would later become, uh, the state of Wisconsin. And in those treaties, the Ojibwe Native Americans, um, were allowed to hunt, fish and gather on off-reservation lands as a part of those.And for a long time, those treaty rights were really not acknowledged. Uh, but in the early 1980s, uh, through the Voigt case, those treaty rights to hunt fish and gather on off-reservation lands in the ceded territory of Wisconsin were affirmed. And so, um, tribal spearfishing for walleye in the Spring, um, was back again, um, as allowed by those treaties.And so, what it set up was the challenge of now, um, managing a joint fishery for walleye that is a travel spearfishing and recreational angling fishery. And at that time as an agency, we really only had walleyed data on some of our best wildlife populations. We didn't have a standardized monitoring program.And so, um, establishing a management plan that would be sustainable. Um, given the joint fishery, um, was a challenge, uh, but we had Escanaba Lake, which at that time had 40 years or so of....oh, yeah, 40, 30, 40 years of data or so on walleye harvest from Escanaba Lake and exploitation rates during that time. And so during that time, when the walleye management plan was being developed and standardized, uh, by 1990, the average sustainable exploitation rate for walleye in Escanaba Lake was 35%.And that's still what is used today as the limit reference point in our ceded territory of walleye fisheries. And when I say limit reference point, is it's not a target to hit 35% for every walleye population it's the maximum allowable, so to speak. And so,now we use that 35% and the management plan was set up not to achieve that or not to exceed it except in one in 40 cases.And so most cases, the walleye management plan is set up, uh, primarily based on the Escanaba data and observations from that individual population. Is that our exploitation rates range in the oh 12 to 14% or so annually between the recreational and tribal fishery. And so that information that was collected in the long-term walleye population abundances and recruitment in Escanaba Lake was primarily the backdrop and establishing the current walleye management plan used today. Um, although as we've gained more information from Escanaba Lake and other walleye populations in northern Wisconsin, uh, we often look to that now, um, to help us make tweaks within the management plan when necessary.KATIE GRANT: [00:17:23] You've mentioned a couple of times that, you know, the, the fishery research area is really important for getting that data set, but it's also important for us to try out regulations and, and learn what the effects of those regulations may be. What have we learned from the current walleye regulation on Escanaba Lake? GREG SASS: [00:17:41] You know, starting in 1946, we had no closed season, no bag limit, or no size limit on walleyes in Escanaba Lake. And that regulation ran the same up until 2003. And my predecessor at the station, uh, before me, uh, decided that we're going to go in completely the opposite direction and essentially eliminate harvest a walleye to see how that white population responded. And so in 2003, uh, we went from no closed season, no bag limit, no size limit for walleye in Escanaba Lake to a 28 inch minimum length limit and a daily bag of one fish on Escanaba Lake. And since 2003, um, there's not been a single walleye legally harvested from the lake in the recreational fishery. Although there's been a little bit of tribal harvest in there. And what we've learned from that regulation, I think are a couple of things most importantly. Um, you know, one, uh, we sawthe abundance of adult walleyes, jump up a little bit, which would be the expected given the lack of harvest. Um, but we didn't see major growth responses, um, to that elimination of harvest. And I think that's simply because there's a lot more mouths to feed out there on the lake right now. And so fish aren't growing maybe as fast as they used to.Uh, we also, with those growth rates going down, I've seen, um, a little bit of a delay in maturation, um, compared to what we saw, uh, before the regulation. And we've also seen low and stable recruitment and so reproduction of young fishes. And so we had much more booms and busts, uh, in recruitment of walleye when it was more heavily exploited. Under low exploitation, uh, we've kind of just seen low and stable recruitment, which is very different from what we observed previously. And we reasoned that that's likely just an unexploitation effect such as there's already a lot of mouths to feed in the lakes. And there's also a lot of competition. And so, um, we don't see a higher level of recruitment like we do, um, under exploitation. In many ways Escanaba Lake right now is, um, acting like relatively unexploited walleye fisheries and other places for example. Canadian shield lakes, we have a lot of fish in the [unintelligible] range out there. Uh, but we don't see it a lot of, uh, very large individuals, just because of the sheer number of fish in the population.KATIE GRANT: [00:19:50] Technically speaking, walleye could be harvested, it's just that there's that length, a minimum that needs to be met and they just haven't been growing big enough and being caught if they are, uh, to be able to be legally harvested. Right?GREG SASS: [00:20:03] That's correct. And so we just, we don't have a lot of large fish in the population. In fact, uh, we haven't seen her in a couple of years in our Spring surveys, but, um, the only walleye that we've had since 2003, that's exceeded 28 inches is Floy tag number [audio glitch] 2110. And it's a female that's just over 28 inches. Uh, but she's definitely an anomaly and may have passed on, um, her nest by now because we haven't seen her a couple of years in our nets. Basically what we see... yes, walleye...anglers can harvest walleyes that are greater than 28 inches. They're just not present in the population. KATIE GRANT: [00:20:35] So when does that kind of experimental regulation end and what is the proposed new regulation?GREG SASS: [00:20:42] The current regulation will end starting next summer on the second Saturday in June. And so we've learned what we think we're going to learn from this lack of exploitation and the response to the Escanaba Lake walleye population to it.And so now, uh, we're going to go in a different direction. We've seen some natural recruitment issues on some of our walleye lakes in northern Wisconsin over time. We also have some evidence that because of those natural recruitment declines, that there could be some production over-harvest of walleyes, which basically means that, uh, we're, you know, we're continuing to fish them, but we're just not getting, um, as many fish being produced to replace them.And so, um, we're going to test a production over harvest experiment on Escanaba Lake that new experiment and regulation will be what I'll call our ceded territory default regulation for walleye. Which will be a 15 inch minimum length limit. A 20 to 24 inch protected, no harvest slot length limit with a daily bag limit of three fish with only one fish allowed over 24 inches.And so this is a regulation that was implemented on many ceded the territory of Wisconsin lakes several years ago. And this regulation will also allow us to test, um, sort of influences of, of that regulation. But more importantly, is that within that regulation, we'll be establishing an annual quota in pounds of walleyes that we would like to have removed from Escanaba Lake to test the production over harvest question.So we'll do our Spring surveys. We'll annually establish that harvest quota. And then on June 15th, I'm sorry, the second Saturday in June. Um, anglers will then be allowed to, um, harvest. That walleye quota. Um, and when that quota is met for the year, then the walleye fishery will close on, on Escanaba until the following second Saturday in June.Um, I'll also mention that, uh, we'll have a tribal component to this as long as the, uh, uh, tribal members declare the lake for Spring spearfishing. So this is another important component of the experiment, uh, that will be, um, removed from that annual harvest quota, um, to meet our goals.KATIE GRANT: [00:22:48] Yeah. And I think that's a really interesting, uh, you know, demonstration of the fact that these are in fact research lakes. It's not that you've learned any or you've you found anything good or bad necessarily to cause the regulation change. The regulation changes really just... These lakes are for research. You've gotten the data sets that you need to be able to, you know, infer the information that you you were looking for or prove your hypothesis. And now it's time to try something new.GREG SASS: [00:23:17] Exactly. And so, um, you know, these are research lakes and research lakes are somewhat hard to come by. But every regulation change or experiment that we try, or, or some sort of manipulation we try in a lake, is an experiment that we can learn important things from.And so, uh, you know, we're excited about this next regulation change and this next experiment. Uh, we think it's gonna help us to inform walleye management, um, in Wisconsin and, and teach us some new things. And, um, that's, that's really what it's all about is using these experiments, uh, to sustain fisheries and having these uh, research lakes established to do that, um, because it allows us to make science-based decision-making.KATIE GRANT: [00:23:57] So, obviously the last 75 years have been really productive in terms of research. You've gotten that giant data set. What do you hope to see happen within the research area over the next 25 years?GREG SASS: [00:24:11] Well, first I'd say I just appreciate the agencies and uh, the sport fish restoration program from the US Fish and Wildlife service for the continual support of the agency. And 75 years is a long time for everything, uh, for anything, but it requires support and, you know, adequate funding, um, to do that. And so, um, I'd just like to acknowledge those sources there and, and thanks for the continued support.And I hope that continues for the next 25 years and, and the next a hundred years after that, um, as we continue to maintain this dataset, um, Looking forward. Um, I think, you know, some of our main goals are one of mine for sure, is that early on in our time series, um, we didn't collect a lot of non-fisheries related data and so things like water quality or what's happening on the landscape or in the watershed.And so, um, we've implemented some broader sampling in order to get those water quantity, quality characteristics. Look at habitat within the lakes, and then also within the watersheds and even more, um, regionally. Um, so that we can take a more holistic approach at what might be influencing our fish populations overall.And so, um, if anything, over the next 25 years, I look forward to continuing, to not only leverage the great data set that we have with the Northern Highland Fishery Research Area. Uh, but take a more ecosystem-based approach, um, along with social economic and social-ecological approaches, um, to help us understand our fisheries now.And how they might respond to, uh, various changes, perturbations disturbances in the future. And then how we can use that for, um, applying management actions in Wisconsin for other fisheries and beyond. KATIE GRANT: [00:25:49] Yeah. I think that's a really fantastic thing to note is that, you know, so much of that data set is just the fish and not that over overarching, uh, kind of ecosystem perspective. I'm excited to see what you guys are able to, to make happen there in terms of, uh, kind of further expanding that research. GREG SASS: [00:26:08] It's very exciting for the station right now. I mean, not only is the 75th anniversary this year, um, you know, but also mentioned just the, the network that we as a station are involved with.There's a lot of different scientific entities in, uh, in this region and throughout the state. And again, in some of our partners across the Midwest, um, that we've been able to tap into and it just creates this large network. For example, we do a lot of collaboration with UW Madison Center for Limnology, which is just at Trout Lake, which is only a few miles from the Northern Highland Fishery Research Area.Uh, they're linked into another long-term ecological research program, which has 40 plus years of data now. Um, so we partnered with them very frequently. Um, we work within our, with our partners within the agency, of course, we're working with the Great Lakes Indian Fish and Wildlife Commission, which has some longer-term data and outstanding biologists and scientists.Um, the University of Notre Dame has a research center that's very near, um, to the, to the area up here, just across the border in the upper peninsula, Michigan. Um, and we're also partners, partnering with some private entities that have allowed us to do research on their lakes to help them achieve some of their management goals and address our research goals.And so the future is very, very bright and, uh, we continue to be thankful for these partnerships and everyone that's engaging in these broader collaborations because it allows us to do things, um, that are bigger and, and very relevant for, uh, fisheries management, aquatic ecological research and just, you know, clean water across the landscape up here. Um, so it's, it's it's really amazing to be a part of. KATIE GRANT: [00:27:38] Is there anything else that we might not have talked about that you want us to know about the Northern Highland Fisheries Research Area? GREG SASS: [00:27:46] I think the last thing is, is come, come pay us a visit. You know, most much of the data we collect and the things that we're able to do are, are collected by the anglers themselves.And so the compulsory Creel survey and all the great information that we've been able to collect over the seventy-five years. Wouldn't be possible if we didn't have anglers fishing the lakes.KATIE GRANT: [00:28:06] Have a question about the research being done here at the DNR? Email us.  dnrpodcast@wisconsin.gov and we'll work with our experts to get you an answer.SARAH HOYE: [00:28:21] You've been listening to Wild Wisconsin. A podcast brought to you by the Wisconsin DNR. For more great episodes, listen and subscribe to Wild Wisconsin wherever you get your podcasts.

Deborah Bronk joined Bigelow Laboratory for Ocean Sciences in February 2018 as its president and CEO; her expertise is in marine-estuarine and environmental sciences. Deborah has conducted more than 50 research cruises and field studies in freshwater and marine environments from pole to pole, and previously served as division director for the National Science Foundation’s Division of Ocean Science and as President of the Association for the Sciences of Limnology and Oceanography. In December 2020, Deborah was elected a Fellow of the American Association for the Advancement of Science (AAAS), and recognized for her substantial research advances on the marine nitrogen cycle and for leadership in the ocean science research community. Deborah was recently elected as the newest president of The Oceanography Society; her term begins in 2023 and will run for two years. And she was one of the scientists involved in The Warming Sea project.  The new Maine Science Festival store is found at  http://bit.ly/MSF-store; the Warming Sea + Sea Bags fundraiser can be found at http://bit.ly/MSF-TWS-SB.  ~~~~~~~The Maine Science Podcast is a production of the Maine Science Festival. It was recorded at Discovery Studios, at the Maine Discovery Museum, in Bangor, ME. Edited and produced by Kate Dickerson; production support by Maranda Bouchard and social media support from Next Media. The Discover Maine theme was composed and performed by Nick Parker. Support provided by Maine Technology Institute. Find us online:Website - Maine Science FestivalMaine Science Festival on social media: Facebook    Twitter     InstagramMaine Science Podcast on social media: Facebook    Twitter     Instagramcontact us: podcast@mainesciencefestival.org 

Right now, there is a lake in Vilas County that has no snow on it. Researchers based out of UW-Trout Lake Station in Boulder Junction use shovels, snowblower, and plows to keep it clear all winter long, leaving the thick ice exposed. It's the second year of field work for the study that is looking at the impact of what no snow or ice cover could mean for the health of lakes in the Northwoods. WXPR first told you about study last winter on The Stream . “This year we actually had freeze up. You might recall that the lakes this year froze really nicely before it started snowing,” said Hilary Dugan, an assistant professor at UW-Madison's Center for Limnology. “We got this really nice black ice so the conditions this even better for our experiment than the conditions last year.” The study uses Trout Bog as a control lake for the study. There are no homes on the lake, and it's been untouched except for where the researchers are collecting samples in the middle of the lake. Dugan and her team

In this episode of Environmentality. I connect with Caitlin Charlton to discuss all things alpine lakes and ecology. In particular, we discuss the impacts of human activity and climate change on these alpine regions, and what solutions, both big and small, that can be taken to mitigate their impacts.Caitlin is a graduate student in the Ecology program at Colorado State University. In this episode, she discusses in great detail some of the experiments that she and her research lab group are conducting in the Rocky Mountain National Park and beyond. She discusses the impacts of nutrient deposition on alpine lakes and how that can lead to toxicity and eutrophication. She also shares about the impacts of human waste and hikers not following "leave no trace" principles while hiking in the Rockies. Caitlin and I also chat about lake submarines, Clif bar wrappers, caffeine in human waste and regulations being implemented to reduce nitrogen and phosphorous deposition in alpine lakes. To learn more about Caitlin and her field work check out her Instagram here: @caitlincharl10Additional information about her research can be found here.

Following the mutated Beast of Ill Omens, the party ventures into a deep cave system searching for clues and loot. They end up finding a new ally before traveling to the Port City of Nassau.

Upon graduation from Purdue University in 1977, Dr. Guy Meadows joined the faculty of the University of Michigan, College of Engineering, where he served as Professor of Physical Oceanography for 35 years. During his tenure, he served the College and University as Director of the Ocean Engineering Laboratory, Director of the Cooperative Institute for Limnology and Ecosystems Research (NOAA, Joint Institute), Director of the Marine Hydrodynamics Laboratories and founding Academic Director of the M-STEM Academy. He joined Michigan Tech in June of 2012, to help establish the new Great Lakes Research Center. His primary goal, to blend scientific understanding and technological advancements into environmentally sound engineering solutions for the marine environment, through teaching, research and service.His teaching reaches beyond the University setting to less formal environments, and includes five nationally televised documentaries for the History and Discovery Channels. His primary research interests are in geophysical fluid dynamics with emphasis on environmental forecasting and full-scale, Great Lakes and coastal ocean experimental hydrodynamics. In this arena, he has influenced policy and explored societal impacts of environmental forecasting for coastal management, recreational health and safety, and regional climate change.

Jim Elser is the Bierman Professor of Ecology at the University of Montana and Director of the Flathead Lake Biological Station. Jim is a world class scholar, evidenced by his recent election to the National Academy of Sciences. In this conversation we learn all about limnology, why it's important, and why Montana is the best place on earth for Jim's research.

Dr. Mary E. Power is a Professor in the Department of Integrative Biology at the University of California, Berkeley as well as Faculty Manager at the Angelo Coast Range Reserve and Director of the California Biodiversity Center. Mary is also a contributing scientist in a new documentary film called The Serengeti Rules. Over the course of her career, Mary has studied the ecosystems of four different rivers. Her work to understand the food webs in those rivers has involved observation and taking field notes, mapping and quantitative observations to identify patterns, developing questions and hypotheses, and then testing her hypotheses with experiments. Mary loves to listen to and play folk and rock and roll music. She has been learning to play Celtic music on the mandolin as well as rock and roll music from the ‘60s and ‘70s on the guitar. She received her B.A. in biology from Brown University, her M.S. in biology from the Boston University Marine Program at Woods Hole, and her PhD in zoology from the University of Washington. Mary is a Member of the U.S. National Academy of Sciences, a Fellow of the American Academy of Arts and Sciences, and a Fellow of the California Academy of Sciences. She has been awarded the G. Evelyn Hutchinson Medal from the American Society of Limnology and Oceanography, the Kempe Award for Distinguished Ecologists, a Guggenheim Fellowship, and an honorary doctorate degree from Umeå University in Sweden. In addition, Mary is past president of the Ecological Society of America and the American Society of Naturalists. In our interview Mary shares more about her life and science.

Dr. Arial Shogren and Dr. Jake Zwart discuss efforts to increase representation of freshwater science topics on Wikipedia.

The legend went that evil spirits would infrequently emerge from the lake to take the lives of those around it. Turns out, this isn't all myth; instead, it's grounded in geomythology - when cultures craft myths to explain historic geologic events. In 1986, the lake wrought havoc again, killing nearly 2,000 people overnight in an event called a limnic eruption.

Today on the show, we’re joined in the home studio by Dr. Keith Sabin. Keith got his undergraduate degree in International Environmental Studies at Rutgers University. After a detour in East Asian Studies at Hebrew University, he got his Master’s in Limnology (which is the study of fresh water bodies of water) at the University of Wisconsin-Madison. He also got a Master’s of Public Health in Epidemiology at Columbia University. He then got his PhD in International Health-Epidemiology at Johns Hopkins Bloomberg School of Public Health. He has since worked at the CDC and WHO as senior epidemiologist, and is currently Senior Advisor in Epidemiology at UNAIDS. We really loved this interview! We got to hear about New York in the late ‘70s, HIV from a global perspective, and why public health workers and medical doctors aren’t always on the same wavelength. We hope you like it!

In 2000, he received his Master's degree as a North-South dialogue scholarship holder after completing a joint study programme at the "Institute for Water Education" in Delft, the Netherlands, and the Institute for Limnology in Mondsee/Salzburg. He remained faithful to fresh water research, although this topic was not his first choice when he commenced his studies. He completed his PhD at the Vienna University of Technology. This was the beginning of his career, which, as it continued, presented him with a variety of occupations, some of them even to his own surprise. Today, he is a leading expert in the organization Sustainable Energy for All.You can find Paul Yillias alumni portrait here.

Dr. Sapna Sharma is an Associate Professor in Biology at York University. She received her PhD in Ecology and evolution from the University of Toronto and completed postdoctoral fellowships at the University of Montreal and the Center for Limnology at the University of Wisconsin-Madison. She served on the faculty at Loyola before joining the faculty at York where she is today. Sapna is also founder of a science outreach program at York University for refugee children called SEEDS. She is with us today to tell us all about her journey through life and science.

The integration of data from two or more domains is required for addressing many fundamental scientific questions and understanding how to mitigate challenges affecting humanity and our planet. In March 2015, AIBS convened a workshop that brought together more than two dozen experts in genetics, genomics and metagenomics, biology, systematics, taxonomy, ecology, bio- and ecoinformatics, and cyberinfrastructure development. The workshop was co-chaired by Dr. Corinna Gries, Lead Information Manager at the Center for Limnology at the University of Wisconsin, who joins us to discuss the challenge of complex data integration and AIBS's upcoming Council Meeting on Addressing Biological Informatics Workforce Needs.   Read the workshop report on complex data integration. Learn more about the upcoming AIBS Council Meeting. Read the AIBS workshop report on Changing Practices in Data Publication.

Seit 40 Jahren besteht eine wissenschaftliche Zusammenarbeit zwischen Ostafrika und Österreich im Bereich der Gewässerökologie, das IPGL Masterprogramm (International Training Programmes in Limnology) ist eines der ältesten Programme der Österreichischen Entwicklungszusammenarbeit (OEZA). Koordiniert werden zahlreiche Trainingsprogramme zwischen Institutionen der höheren Bildung und Forschung, mit dem Ziel Forschungskapazitäten zu erweitern und damit die Erreichung der Nachhaltigen Entwicklungsziele (SDGs) zu unterstützen. Mehr als 550 junge Wissenschafter/innen aus Entwicklungsländern und Europa haben an diesem Jubiläumsprogramm teilgenommen. In der Sendung berichten am IPGL Programm Involvierte über aktuelle Umweltveränderungen und Fischparasiten sowie über die Relevanz dieser Forschung für Menschen am Beispiel des Lake Baringo in Kenia, über gemeinsames Studieren und Lernen mit internationalen Student/innen aus Afrika, Südamerika und Asien sowie über Erfolge, Erfahrungen und Herausforderungen dieser internationalen Forschungskooperationen mit österreichischer Beteiligung.Im InterviewProf. Nzula Kitaka, Biologin, Egerton Universität (Kenya)Dr. Najib Bateganya, IPGL Absolvent, Stipendiat des APPEAR-Programms, UgandaGäste:Mag. Gerold Winkler, Projektleiter IPG- LWM Programm, Institut für Hydrobiologie und Gewässermanagement (IHG), Universität für Bodenkultur WienMag.a Pamela Gumpinger, Studentin des AL Masterstudium, Universität für Bodenkultur, WienAnna Schöpfer, Studentin des LWM Joint Masterstudiums BOKU, Egerton Universität und UNESCO-IHEGestaltung: Maiada Hadaia (für den Sendungsinhalt verantwortlich)Sendetermin: Freitag, 09.10.2015, 20:00-21.00 UhrMusik: Tchakare Kanyembe - track04 & Noise Problems - 02, Prince Martin-Let's talk about love, Karl Ramirez-Kalahati ng Mundo. Nachzuhören auf Jamendo, einer Community für freie, legale und unlimitierte Musik, die unter Creative Commons Lizenzen veröffentlicht wurde.

Dr. Neo Martinez is an Associate Professor of Ecology and Evolutionary Biology and The University of Arizona and Director and Founder of the Pacific Ecoinformatics and Computational Ecology Lab in Berkeley. He is also an Affiliated Researcher of the Energy and Resources group at the University of California Berkeley. Neo received a Masters degree in Oceanography and Limnology from the University of Wisconsin, Madison and his Masters and PhD degrees in Energy and Resources from the University of California, Berkeley. Afterward, he accepted a National Science Foundation and Ford Foundation Postdoctoral Fellowship working as Principal Investigator at the Rocky Mountain Biological Laboratory and at the UC Davis Bodega Marine Lab. He was also a faculty member at San Francisco State University before joining the faculty at The University of Arizona. Neo is here with us today to tell us about his journey through life and science.

Ocean colour remote sensing has often been used to study polar seas, especially in Antarctica where the optical properties of the upper ocean are not as complex as they are in the Arctic (Comiso et al., 1990, Comiso et al., 1993, Sullivan et al., 1993, Arrigo et al., 1998, Stramski et al., 1999, Arrigo et al., 2008b). It was shown based on OC data that primary production in Antarctic waters has changed little over the last 14 years (Arrigo et al., 2008b). In contrast, the few studies that have been conducted to date in the Arctic Ocean suggest that pan‐Arctic primary production, as well as photooxidation of coloured dissolved organic matter have been increasing (Belanger et al., 2006, Pabi et al., 2008, Arrigo et al., 2008a) as a consequence of receding perennial ice. The annual maximum phytoplankton biomass is now reached earlier in several Arctic seas (Kahru et al., 2010). As the extent of the seasonal ice zone increases (difference between the annual maximum and minimum extents), ice‐edge blooms may play a heightened role (Perrette et al., 2011). The on‐going changes within the context of accelerating climate change necessitate a vastly improved understanding of the polar ecosystems based on an intensive observation program. The use of ocean colour remote sensing in polar regions is, however, impeded by a number of difficulties and intrinsic limitations including: The prevailing low solar elevations. At high latitudes, the Sun zenith angle is often larger than the maximum (generally 70°) for which atmospheric correction algorithms have been developed based on plane‐parallel radiative transfer calculations. Consequently, at high latitudes, a large fraction of the ocean surface is undocumented for a large part of the year even though primary production may be significant. The impact of ice on remotely sensed reflectance. Belanger et al (2007) and Wang et Shi (2009), used radiative transfer simulations to examine the effects of the sea ice adjacency and sub‐pixel ice contamination on retrieved seawater reflectance and level‐2 ocean products. They found significant impacts within the first several kilometres from the ice‐edge and for concentrations of sub‐pixel ice floes exceeding a few percent. The deep chlorophyll maximum (DCM). A DCM is very often observed both in the Antarctic and Arctic Oceans. In the Arctic Ocean, the freeze‐thaw cycle of sea ice and the large export of freshwater to the ocean by large Arctic rivers create pronounced haline stratification within the surface layer. In post‐bloom conditions, a deep‐chlorophyll maximum is associated with such vertical stratification. Contrary to the DCM observed at lower latitudes (Cullen, 1982), the Arctic DCM often corresponds to a maximum in particulate carbon and primary production (Martin et al., 2010). The statistical relationships between surface chlorophyll and chlorophyll concentration at depth developed for lower latitudes (Morel et Berthon, 1989) are most probably not valid for the polar seas (Martin et al., 2010). Ignoring the vertical structure of the chlorophyll profile in the Arctic Ocean leads to significant errors in the estimation of the areal primary production (Pabi et al., 2008, Hill et Zimmerman, 2010). The peculiar phytoplankton photosynthetic parameters. The low irradiance and seawater temperature prevailing in polar seas are associated with unique biooptical and photosynthetic parameters characteristic of extreme environments (Rey, 1991) that must be accounted for in primary production models. To date, only a few studies have attempted to do so in the Arctic Ocean (Arrigo et al., 2008b). The optical complexity of seawater, especially over the Arctic shelves. Because of the important freshwater inputs, the Arctic continental shelves, which occupy 50% of the area, are characterized by high concentrations of CDOM (Matsuoka et al., 2007, Belanger et al., 2008). Also, as a consequence of photoacclimation to low irradiances, phytoplankton cells often contain large amounts of pigments. The chlorophyll‐specific absorption coefficient is therefore particularly low due to pronounced pigment packaging (Cota et al., 2003, Wang et al., 2005). Because of these optical peculiarities, standard ocean colour algorithms do not work in the Arctic Ocean (Cota et al., 2004, Matsuoka et al., 2007). The persistence of clouds and fog. High latitudes are known to present a heavy cloud cover. In addition, as soon as sea ice melts and opens waters come in direct contact with the atmosphere, fog develops near the sea surface. These features limit the usage of ocean colour data. This lecture will cover all of the topics mentioned above and will be organized into two parts (90’ each) as detailed below : 1 Ocean colour remote sensing in polar seas Ocean, sea ice and atmosphere in Arctic and Antarctic: relevant features Seawater optical properties Retrieval of ocean properties from ocean colour: Atmospheric corrections Contamination of the signal by sea ice Retrieval of IOPs and AOPs, and biogeochemically relevant variables Availability of data as favoured by polar orbits and limited by elevated Cloudiness 2 Primary production estimates from OC in polar seas General features of Arctic and Antarctic Oceans related to PP (phytoplankton species, annual cycle of PP, nutrients, DCM) PP models and their validation Results from PP models Bibliography Arrigo KR, Van Dijken G, Pabi S, 2008a. Impact of a shrinking Arctic ice cover on marine primary production. Geophysical Research Letters 35. Arrigo KR, Van Dijken GL, Bushinsky S, 2008b. Primary production in the Southern Ocean, 1997 2006. Journal of Geophysical ResearchOceans 113. Arrigo KR, Worthen D, Schnell A, Lizotte MP, 1998. Primary production in Southern Ocean waters. Journal of Geophysical ResearchOceans 103, 15587‐600. Belanger S, Babin M, Larouche P, 2008. An empirical ocean color algorithm for estimating the contribution of chromophoric dissolved organic matter to total light absorption in optically complex waters. Journal of Geophysical ResearchOceans 113. Belanger S, Ehn JK, Babin M, 2007. Impact of sea ice on the retrieval of water‐leaving reflectance, chlorophyll a concentration and inherent optical properties from satellite ocean color data. Remote Sensing of Environment 111, 51‐68. Belanger S, Xie HX, Krotkov N, Larouche P, Vincent WF, Babin M, 2006. Photomineralization of terrigenous dissolved organic matter in Arctic coastal waters from 1979 to 2003: Interannual variability and implications of climate change. Global Biogeochemical Cycles 20. Comiso JC, Maynard NG, Smith WO, Sullivan CW, 1990. Satellite Ocean Color Studies of Antarctic Ice Edges in Summer and Autumn. Journal of Geophysical ResearchOceans 95, 9481‐96. Comiso JC, Mcclain CR, Sullivan CW, Ryan JP, Leonard CL, 1993. Coastal Zone Color Scanner Pigment Concentrations in the Southern‐Ocean and Relationships to Geophysical Surface‐Features. Journal of Geophysical ResearchOceans 98, 2419‐51. Cota GF, Harrison WG, Platt T, Sathyendranath S, Stuart V, 2003. Bio‐optical properties of the Labrador Sea. Journal of Geophysical ResearchOceans 108. Cota GF, Wang H, Comiso JC, 2004. Transformation of global satellite chlorophyll retrievals with a regionally tuned algorithm. Remote Sensing of Environment 90, 373‐7. Cullen JJ, 1982. The Deep Chlorophyll Maximum ‐ Comparing Vertical Profiles of Chlorophyll‐A. Canadian Journal of Fisheries and Aquatic Sciences 39, 791‐803. Hill VJ, Zimmerman RC, 2010. Estimates of primary production by remote sensing in the Arctic Ocean: Assessment of accuracy with passive and active sensors. DeepSea Research Part IOceanographic Research Papers 57, 1243‐54. Kahru M, Brotas M, Manzano‐Sarabia M, Mitchell BG, 2010. Are phytoplankton blooms occurring earlier in theArctic? Global change biology doi: 10.111/j.13652486.2010.02312.x. Martin J, Tremblay JE, Gagnon J, et al., 2010. Prevalence, structure and properties of subsurface chlorophyll maxima in Canadian Arctic waters. Marine EcologyProgress Series 412, 69‐84. Matsuoka A, Huot Y, Shimada K, Saitoh SI, Babin M, 2007. Bio‐optical characteristics of the western Arctic Ocean: implications for ocean color algorithms. Canadian Journal of Remote Sensing 33, 503‐18. Morel A, Berthon JF, 1989. Surface Pigments, Algal Biomass Profiles, and Potential Production of the Euphotic Layer ‐ Relationships Reinvestigated in View of Remote‐Sensing Applications. Limnology and Oceanography 34, 1545‐62. Pabi S, Van Dijken GL, Arrigo KR, 2008. Primary production in the Arctic Ocean, 1998‐2006. Journal of Geophysical ResearchOceans 113. Perrette M, Yool A, Quartly GD, Popova EE, 2011. Near‐ubiquity of ice‐edge blooms in the Arctic. Biogeosciences 8, 515‐24. Rey F, 1991. Photosynthesis‐Irradiance Relationships in Natural Phytoplankton Populations of the Barents Sea. Polar Research 10, 105‐16. Stramski D, Reynolds RA, Kahru M, Mitchell BG, 1999. Estimation of particulate organic carbon in the ocean from satellite remote sensing. Science 285, 239‐42. Sullivan CW, Arrigo KR, Mcclain CR, Comiso JC, Firestone J, 1993. Distributions of Phytoplankton Blooms in the Southern‐Ocean. Science 262, 1832‐7. Wang J, Cota GF, Ruble DA, 2005. Absorption and backscattering in the Beaufort and Chukchi Seas. Journal of Geophysical ResearchOceans 110. Wang MH, Shi W, 2009. Detection of Ice and Mixed Ice‐Water Pixels for MODIS Ocean Color Data Processing. Ieee Transactions on Geoscience and Remote Sensing 47, 2510‐8.

Ocean colour remote sensing has often been used to study polar seas, especially in Antarctica where the optical properties of the upper ocean are not as complex as they are in the Arctic (Comiso et al., 1990, Comiso et al., 1993, Sullivan et al., 1993, Arrigo et al., 1998, Stramski et al., 1999, Arrigo et al., 2008b). It was shown based on OC data that primary production in Antarctic waters has changed little over the last 14 years (Arrigo et al., 2008b). In contrast, the few studies that have been conducted to date in the Arctic Ocean suggest that pan‐Arctic primary production, as well as photooxidation of coloured dissolved organic matter have been increasing (Belanger et al., 2006, Pabi et al., 2008, Arrigo et al., 2008a) as a consequence of receding perennial ice. The annual maximum phytoplankton biomass is now reached earlier in several Arctic seas (Kahru et al., 2010). As the extent of the seasonal ice zone increases (difference between the annual maximum and minimum extents), ice‐edge blooms may play a heightened role (Perrette et al., 2011). The on‐going changes within the context of accelerating climate change necessitate a vastly improved understanding of the polar ecosystems based on an intensive observation program. The use of ocean colour remote sensing in polar regions is, however, impeded by a number of difficulties and intrinsic limitations including: The prevailing low solar elevations. At high latitudes, the Sun zenith angle is often larger than the maximum (generally 70°) for which atmospheric correction algorithms have been developed based on plane‐parallel radiative transfer calculations. Consequently, at high latitudes, a large fraction of the ocean surface is undocumented for a large part of the year even though primary production may be significant. The impact of ice on remotely sensed reflectance. Belanger et al (2007) and Wang et Shi (2009), used radiative transfer simulations to examine the effects of the sea ice adjacency and sub‐pixel ice contamination on retrieved seawater reflectance and level‐2 ocean products. They found significant impacts within the first several kilometres from the ice‐edge and for concentrations of sub‐pixel ice floes exceeding a few percent. The deep chlorophyll maximum (DCM). A DCM is very often observed both in the Antarctic and Arctic Oceans. In the Arctic Ocean, the freeze‐thaw cycle of sea ice and the large export of freshwater to the ocean by large Arctic rivers create pronounced haline stratification within the surface layer. In post‐bloom conditions, a deep‐chlorophyll maximum is associated with such vertical stratification. Contrary to the DCM observed at lower latitudes (Cullen, 1982), the Arctic DCM often corresponds to a maximum in particulate carbon and primary production (Martin et al., 2010). The statistical relationships between surface chlorophyll and chlorophyll concentration at depth developed for lower latitudes (Morel et Berthon, 1989) are most probably not valid for the polar seas (Martin et al., 2010). Ignoring the vertical structure of the chlorophyll profile in the Arctic Ocean leads to significant errors in the estimation of the areal primary production (Pabi et al., 2008, Hill et Zimmerman, 2010). The peculiar phytoplankton photosynthetic parameters. The low irradiance and seawater temperature prevailing in polar seas are associated with unique biooptical and photosynthetic parameters characteristic of extreme environments (Rey, 1991) that must be accounted for in primary production models. To date, only a few studies have attempted to do so in the Arctic Ocean (Arrigo et al., 2008b). The optical complexity of seawater, especially over the Arctic shelves. Because of the important freshwater inputs, the Arctic continental shelves, which occupy 50% of the area, are characterized by high concentrations of CDOM (Matsuoka et al., 2007, Belanger et al., 2008). Also, as a consequence of photoacclimation to low irradiances, phytoplankton cells often contain large amounts of pigments. The chlorophyll‐specific absorption coefficient is therefore particularly low due to pronounced pigment packaging (Cota et al., 2003, Wang et al., 2005). Because of these optical peculiarities, standard ocean colour algorithms do not work in the Arctic Ocean (Cota et al., 2004, Matsuoka et al., 2007). The persistence of clouds and fog. High latitudes are known to present a heavy cloud cover. In addition, as soon as sea ice melts and opens waters come in direct contact with the atmosphere, fog develops near the sea surface. These features limit the usage of ocean colour data. This lecture will cover all of the topics mentioned above and will be organized into two parts (90’ each) as detailed below : 1 Ocean colour remote sensing in polar seas Ocean, sea ice and atmosphere in Arctic and Antarctic: relevant features Seawater optical properties Retrieval of ocean properties from ocean colour: Atmospheric corrections Contamination of the signal by sea ice Retrieval of IOPs and AOPs, and biogeochemically relevant variables Availability of data as favoured by polar orbits and limited by elevated Cloudiness 2 Primary production estimates from OC in polar seas General features of Arctic and Antarctic Oceans related to PP (phytoplankton species, annual cycle of PP, nutrients, DCM) PP models and their validation Results from PP models Bibliography Arrigo KR, Van Dijken G, Pabi S, 2008a. Impact of a shrinking Arctic ice cover on marine primary production. Geophysical Research Letters 35. Arrigo KR, Van Dijken GL, Bushinsky S, 2008b. Primary production in the Southern Ocean, 1997 2006. Journal of Geophysical ResearchOceans 113. Arrigo KR, Worthen D, Schnell A, Lizotte MP, 1998. Primary production in Southern Ocean waters. Journal of Geophysical ResearchOceans 103, 15587‐600. Belanger S, Babin M, Larouche P, 2008. An empirical ocean color algorithm for estimating the contribution of chromophoric dissolved organic matter to total light absorption in optically complex waters. Journal of Geophysical ResearchOceans 113. Belanger S, Ehn JK, Babin M, 2007. Impact of sea ice on the retrieval of water‐leaving reflectance, chlorophyll a concentration and inherent optical properties from satellite ocean color data. Remote Sensing of Environment 111, 51‐68. Belanger S, Xie HX, Krotkov N, Larouche P, Vincent WF, Babin M, 2006. Photomineralization of terrigenous dissolved organic matter in Arctic coastal waters from 1979 to 2003: Interannual variability and implications of climate change. Global Biogeochemical Cycles 20. Comiso JC, Maynard NG, Smith WO, Sullivan CW, 1990. Satellite Ocean Color Studies of Antarctic Ice Edges in Summer and Autumn. Journal of Geophysical ResearchOceans 95, 9481‐96. Comiso JC, Mcclain CR, Sullivan CW, Ryan JP, Leonard CL, 1993. Coastal Zone Color Scanner Pigment Concentrations in the Southern‐Ocean and Relationships to Geophysical Surface‐Features. Journal of Geophysical ResearchOceans 98, 2419‐51. Cota GF, Harrison WG, Platt T, Sathyendranath S, Stuart V, 2003. Bio‐optical properties of the Labrador Sea. Journal of Geophysical ResearchOceans 108. Cota GF, Wang H, Comiso JC, 2004. Transformation of global satellite chlorophyll retrievals with a regionally tuned algorithm. Remote Sensing of Environment 90, 373‐7. Cullen JJ, 1982. The Deep Chlorophyll Maximum ‐ Comparing Vertical Profiles of Chlorophyll‐A. Canadian Journal of Fisheries and Aquatic Sciences 39, 791‐803. Hill VJ, Zimmerman RC, 2010. Estimates of primary production by remote sensing in the Arctic Ocean: Assessment of accuracy with passive and active sensors. DeepSea Research Part IOceanographic Research Papers 57, 1243‐54. Kahru M, Brotas M, Manzano‐Sarabia M, Mitchell BG, 2010. Are phytoplankton blooms occurring earlier in theArctic? Global change biology doi: 10.111/j.13652486.2010.02312.x. Martin J, Tremblay JE, Gagnon J, et al., 2010. Prevalence, structure and properties of subsurface chlorophyll maxima in Canadian Arctic waters. Marine EcologyProgress Series 412, 69‐84. Matsuoka A, Huot Y, Shimada K, Saitoh SI, Babin M, 2007. Bio‐optical characteristics of the western Arctic Ocean: implications for ocean color algorithms. Canadian Journal of Remote Sensing 33, 503‐18. Morel A, Berthon JF, 1989. Surface Pigments, Algal Biomass Profiles, and Potential Production of the Euphotic Layer ‐ Relationships Reinvestigated in View of Remote‐Sensing Applications. Limnology and Oceanography 34, 1545‐62. Pabi S, Van Dijken GL, Arrigo KR, 2008. Primary production in the Arctic Ocean, 1998‐2006. Journal of Geophysical ResearchOceans 113. Perrette M, Yool A, Quartly GD, Popova EE, 2011. Near‐ubiquity of ice‐edge blooms in the Arctic. Biogeosciences 8, 515‐24. Rey F, 1991. Photosynthesis‐Irradiance Relationships in Natural Phytoplankton Populations of the Barents Sea. Polar Research 10, 105‐16. Stramski D, Reynolds RA, Kahru M, Mitchell BG, 1999. Estimation of particulate organic carbon in the ocean from satellite remote sensing. Science 285, 239‐42. Sullivan CW, Arrigo KR, Mcclain CR, Comiso JC, Firestone J, 1993. Distributions of Phytoplankton Blooms in the Southern‐Ocean. Science 262, 1832‐7. Wang J, Cota GF, Ruble DA, 2005. Absorption and backscattering in the Beaufort and Chukchi Seas. Journal of Geophysical ResearchOceans 110. Wang MH, Shi W, 2009. Detection of Ice and Mixed Ice‐Water Pixels for MODIS Ocean Color Data Processing. Ieee Transactions on Geoscience and Remote Sensing 47, 2510‐8.

Dave O spiels forth about the exploration of rivers and lakes, the impetus for ventures and motivations for trade ~ augmented by autoharp songs by Larry Harper dreaming of floating the Colorado River down Glen Canyon ~ then freeverse – mostly from stumbling around Europa in 1992 – thinking about connectedness, lifespans of mysteries and … Continue reading Owl Creek Limnology and Exploration – Postcard #59 →