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SUMMARY:Freshwater Colloquium – Restoration and Conservation of an Ancient Species\, the American Paddlefish
DESCRIPTION:Join the School of Freshwater Sciences for a Colloquium with guest speaker: Dr. Jim Long \nAcipenseriformes\, including American Paddlefish (Polyodontidae\, Polyodon spathula) represents an ancient lineage of fish\, with representatives found back approximately 200 MYA. American Paddlefish is the only remaining extant species of its family\, since the recent extinction of the Chinese Paddlefish (Psephurus gladius). American Paddlefish occur in North America and are large-bodied (> 2 m total length [TL])\, potamadromous\, and have fertilized eggs that stick to hard substrates with pelagic larvae that develop while drifting and moving downstream. Overharvest and habitat fragmentation has reduced Paddlefish populations across its range\, including Oklahoma. In Oklahoma\, restoration efforts have returned the species to former parts of its range\, but factors associated with restoration success have just begun to be assessed. Since 2019\, I have been working with state and federal conservation partners to examine factors associated with Paddlefish restoration success including the development of novel monitoring techniques that include the use of side-scan sonar. Suitable substrate availability does not appear to limit Paddlefish reproduction\, but excessively turbid waters in spawning and rearing environments may. Side-scan sonar is an accurate tool for assessing abundance and can be used to monitor spring spawning movements. Further\, side-scan sonar appears to be a useful monitoring method to identify early age classes of fish.  \nJim Long grew up in the Ozarks of southwest Missouri and received a PhD from Oklahoma State University in 2000. Afterward\, he went to South Carolina as a Fisheries Research Biologist investigating fish community structure in tidal freshwater wetlands. From 2002 to 2009\, Jim worked with the National Park Service as the Fishery Biologist for the southeast region. In 2009\, Jim moved back to Oklahoma as an Assistant Unit Leader and become Unit Leader in 2016. Jim’s research focuses on management-driven questions related to the process of fisheries management\, social dimensions\, early-life history of fishes\, and effects of invasive species on aquatic communities.  \nThis presentation is open to students\, faculty\, staff\, alumni and the public.
URL:https://uwm.edu/freshwater/event/freshwater-colloquium-restoration-and-conservation-of-an-ancient-species-the-american-paddlefish/
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
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DTSTART;TZID=America/Chicago:20260413T150000
DTEND;TZID=America/Chicago:20260413T155000
DTSTAMP:20260518T173441
CREATED:20260331T183035Z
LAST-MODIFIED:20260331T183657Z
UID:10000175-1776092400-1776095400@uwm.edu
SUMMARY:Freshwater Colloquium – From Weather to Paleo:  Capturing the Continuum of Climate Variability
DESCRIPTION:Join the School of Freshwater Sciences for a Colloquium with guest speaker: Dr. Raphaël Hébert \nWeather and climate variability span a continuum of timescales\, from day-to-day fluctuations to millennial-scale changes\, yet these regimes are often studied separately. My work explores how to bring these scales together within a unified framework that captures spatial structure\, temporal persistence\, and dynamical linkages across scales by combining diverse environmental datasets. I will first introduce my ongoing work with Prof. Sergey Kravtsov on data-driven forecasting from daily to seasonal timescales using high-resolution reanalysis products that integrate instrumental and satellite observations since 1980. I will then turn to earlier work using longer instrumental records\, climate model simulations\, and paleoclimate reconstructions to examine how the spatial and temporal covariance structure of climate variability evolves from decadal to centennial and millennial timescales\, highlighting both what we know—and what remains uncertain—about long-timescale climate variability. Together\, these perspectives suggest that similar statistical structures may underlie climate variability across a wide range of timescales and point toward new ways of connecting modern observations with paleoclimate evidence. \nThis presentation is open to students\, faculty\, staff\, alumni and the public.
URL:https://uwm.edu/freshwater/event/freshwater-colloquium-from-weather-to-paleo-capturing-the-continuum-of-climate-variability/
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
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DTSTART;TZID=America/Chicago:20260420T150000
DTEND;TZID=America/Chicago:20260420T155000
DTSTAMP:20260518T173441
CREATED:20260414T194758Z
LAST-MODIFIED:20260414T194758Z
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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:20260518T173441
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
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