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SUMMARY:Freshwater Colloquium – Stock assessment and management of lake whitefish in Wisconsin waters of Green Bay and Lake Michigan
DESCRIPTION:Join the School of Freshwater Sciences for a Colloquium with guest speaker: Dr. Iyob Tsehaye  \nLake whitefish stocks in Wisconsin’s Lake Michigan waters have historically been managed as a single stock originating from North–Moonlight Bays. However\, over the last couple of decades\, this stock has declined in line with broader Lake Michigan trends linked to dreissenid mussel-induced food web shifts. Conversely\, the southern Green Bay population has seen a substantial resurgence after a century-long collapse. Telemetry and tagging data reveal minimal mixing between these groups: Green Bay-spawned fish rarely migrate to the lake side of the Door Peninsula\, and North–Moonlight Bays fish largely remain in northern Lake Michigan. This divergence in productivity and distribution\, further evidenced by the emergence of a major recreational fishery in Green Bay\, necessitates a shift in management. Separate stock assessments confirm that whitefish abundance is now significantly higher within Green Bay than on the lake side of the peninsula. Even so\, assessment models show the number of whitefish in Green Bay has declined by about half since their peak around 2012. While the decline of lake whitefish is likely driven largely by food-web disruptions caused by invasive mussels\, fishing pressure also plays a role. These findings suggest that spatial harvest allocations must be readjusted to reflect the contemporary regional productivity of these distinct stocks.  \nIyob Tsehaye is a Great Lakes Quantitative Fisheries Research Scientist with the Wisconsin Department of Natural Resources (DNR). His research focuses on the assessment and management of recreationally and commercially important fisheries\, such as lake whitefish\, yellow perch and walleye\, as well as investigating predator-prey interactions to inform stocking decisions for salmonine predators. Before joining the DNR in 2015\, Iyob was a postdoctoral researcher at the Quantitative Fisheries Center at Michigan State University. He earned his PhD and MSc degrees from Wageningen University in the Netherlands and his Bachelor’s degree from the University of Asmara in Eritrea. \nThis presentation is open to students\, faculty\, staff\, alumni and the public.
URL:https://uwm.edu/freshwater/event/freshwater-colloquium-stock-assessment-and-management-of-lake-whitefish-in-wisconsin-waters-of-green-bay-and-lake-michigan/
LOCATION:School of Freshwater Sciences Ballroom\, First Floor\, 600 E Greenfield Avenue\, Milwaukee\, WI\, 53204
CATEGORIES:Alumni & Community,Faculty and Staff,Public,Students,UWM Campus Events
ATTACH;FMTTYPE=image/jpeg:https://uwm.edu/freshwater/wp-content/uploads/sites/595/2026/01/Colloquium-Spring-Post-Header.jpeg
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DTSTART;TZID=America/Chicago:20260427T150000
DTEND;TZID=America/Chicago:20260427T155000
DTSTAMP:20260531T131809
CREATED:20260421T162941Z
LAST-MODIFIED:20260421T163020Z
UID:10000183-1777302000-1777305000@uwm.edu
SUMMARY:Freshwater Colloquium – Small Organisms Big Impact: Microbial Insights from the Mississippi River to Caribbean Reefs
DESCRIPTION:Join the School of Freshwater Sciences for a Colloquium with guest speaker: Dr. Michael Henson \nMicroorganisms drive nutrient cycling\, regulate ecosystem productivity\, and respond quickly to environmental change\, making them strong indicators of ecosystem health. In this seminar\, we will discuss how microbial community structure and assembly reveal patterns of environmental organization across large spatial scales\, and how shifts in core microbial taxa reflect underlying ecological processes rather than simple changes in nutrient levels\, using the Mississippi River as a case study. These patterns provide insight into how large rivers process and transform nutrients during downstream transport. We will also cover ongoing work on Caribbean coral reefs\, where a pathogenic ciliate has contributed to widespread mass mortality of sea urchins. By combining environmental sequencing with cultured isolates\, we are exploring how microbial dynamics intersect with disease emergence in a rapidly changing ocean. Together\, these studies show how microbial communities\, from a continental-scale river network to tropical reef ecosystems\, serve as a powerful lens for understanding environmental change. \nMichael Henson is an Assistant Professor of Biological Sciences at Northern Illinois University and leads the Aquatic Microbiology Lab. His research focuses on how microbial communities respond to environmental change and how those responses scale to influence ecosystem processes. He takes an integrative approach that spans cultivation\, physiology\, and genomics\, linking organismal traits to patterns observed at ecosystem scales.\n\nHe earned his PhD at Louisiana State University\, where he developed a foundation in microbial ecology and began combining molecular tools with environmental data to study community structure and function. He then completed postdoctoral training at the University of Southern California and the University of Chicago\, where he further integrated cultivation-based approaches with genomic and ecological analyses to better connect microbial physiology to ecosystem dynamics.\n\nHis current research spans both freshwater and marine systems. In the Mississippi River\, he investigates how microbial communities maintain strong spatial structure despite temporal variability\, and how changes in water quality alter key taxa and ecosystem function. In marine systems\, his work focuses on host–microbe interactions and disease\, particularly through research on the ciliate pathogen affecting sea urchins\, where our lab is working to link ecological changes with disease outbreak patterns.\n\nOutside the lab\, he enjoys gardening with his husband\, traveling\, and spending time outdoors backpacking and camping. At home\, they share their lives and home with their two dogs\, Tyler and Emmy.\nThis presentation is open to students\, faculty\, staff\, alumni and the public.
URL:https://uwm.edu/freshwater/event/freshwater-colloquium-michael-henson/
LOCATION:School of Freshwater Sciences Ballroom\, First Floor\, 600 E Greenfield Avenue\, Milwaukee\, WI\, 53204
CATEGORIES:Alumni & Community,Faculty and Staff,Public,Students,UWM Campus Events
ATTACH;FMTTYPE=image/jpeg:https://uwm.edu/freshwater/wp-content/uploads/sites/595/2026/01/Colloquium-Spring-Post-Header.jpeg
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DTSTART;TZID=America/Chicago:20260610T083000
DTEND;TZID=America/Chicago:20260610T120000
DTSTAMP:20260531T131809
CREATED:20260414T200040Z
LAST-MODIFIED:20260414T200040Z
UID:10000180-1781080200-1781092800@uwm.edu
SUMMARY:Charting New Waters: Prospective Student Voyages
DESCRIPTION:Thinking of a career in freshwater or marine science? Join us aboard the R/V Neeskay for an information session\, tour\, and science field trip – all rolled into one unforgettable experience! \n\nTry hands-on field science tools and techniques – deploy the backbone instruments for Great Lakes and ocean research\nHear from UWM faculty scientists and staff\nCruise the Milwaukee Harbor on a research vessel\nDiscover career paths in water science\nGet tips on applying to undergraduate and graduate programs\n\nTrip dates: \n\nWednesday\, June 10\nTuesday\, June 30\nWednesday\, July 15\n\nOPEN TO PROSPECTIVE STUDENTS ONLY! \nLearn more and register on the official event page.
URL:https://uwm.edu/freshwater/event/charting-new-waters-prospective-student-voyages-2/2026-06-10/
LOCATION:School of Freshwater Sciences\, 600 E Greenfield Avenue\, Milwaukee\, WI\, 53204
CATEGORIES:Prospective Students,UWM Campus Events
ATTACH;FMTTYPE=image/jpeg:https://uwm.edu/freshwater/wp-content/uploads/sites/595/2024/09/charting-new-waters.jpg
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DTSTART;TZID=America/Chicago:20260630T080000
DTEND;TZID=America/Chicago:20260630T120000
DTSTAMP:20260531T131809
CREATED:20260414T200040Z
LAST-MODIFIED:20260414T200040Z
UID:10000181-1782806400-1782820800@uwm.edu
SUMMARY:Charting New Waters: Prospective Student Voyages
DESCRIPTION:Thinking of a career in freshwater or marine science? Join us aboard the R/V Neeskay for an information session\, tour\, and science field trip – all rolled into one unforgettable experience! \n\nTry hands-on field science tools and techniques – deploy the backbone instruments for Great Lakes and ocean research\nHear from UWM faculty scientists and staff\nCruise the Milwaukee Harbor on a research vessel\nDiscover career paths in water science\nGet tips on applying to undergraduate and graduate programs\n\nTrip dates: \n\nWednesday\, June 10\nTuesday\, June 30\nWednesday\, July 15\n\nOPEN TO PROSPECTIVE STUDENTS ONLY! \nLearn more and register on the official event page.
URL:https://uwm.edu/freshwater/event/charting-new-waters-prospective-student-voyages-2/2026-06-30/
LOCATION:School of Freshwater Sciences\, 600 E Greenfield Avenue\, Milwaukee\, WI\, 53204
CATEGORIES:Prospective Students,UWM Campus Events
ATTACH;FMTTYPE=image/jpeg:https://uwm.edu/freshwater/wp-content/uploads/sites/595/2024/09/charting-new-waters.jpg
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BEGIN:VEVENT
DTSTART;TZID=America/Chicago:20260715T080000
DTEND;TZID=America/Chicago:20260715T120000
DTSTAMP:20260531T131809
CREATED:20260414T200040Z
LAST-MODIFIED:20260414T200040Z
UID:10000182-1784102400-1784116800@uwm.edu
SUMMARY:Charting New Waters: Prospective Student Voyages
DESCRIPTION:Thinking of a career in freshwater or marine science? Join us aboard the R/V Neeskay for an information session\, tour\, and science field trip – all rolled into one unforgettable experience! \n\nTry hands-on field science tools and techniques – deploy the backbone instruments for Great Lakes and ocean research\nHear from UWM faculty scientists and staff\nCruise the Milwaukee Harbor on a research vessel\nDiscover career paths in water science\nGet tips on applying to undergraduate and graduate programs\n\nTrip dates: \n\nWednesday\, June 10\nTuesday\, June 30\nWednesday\, July 15\n\nOPEN TO PROSPECTIVE STUDENTS ONLY! \nLearn more and register on the official event page.
URL:https://uwm.edu/freshwater/event/charting-new-waters-prospective-student-voyages-2/2026-07-15/
LOCATION:School of Freshwater Sciences\, 600 E Greenfield Avenue\, Milwaukee\, WI\, 53204
CATEGORIES:Prospective Students,UWM Campus Events
ATTACH;FMTTYPE=image/jpeg:https://uwm.edu/freshwater/wp-content/uploads/sites/595/2024/09/charting-new-waters.jpg
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