Diet composition and overlap for adult walleye,lake whitefish,and yellow perch in Green Bay,Lake Michigan |
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| Affiliation: | 1. Wisconsin Cooperative Fishery Research Unit, University of Wisconsin-Stevens Point, 800 Reserve St., Stevens Point, WI 54481, USA;2. Wisconsin Department of Natural Resources, Bureau of Fisheries Management, 110 South Neenah Ave., Sturgeon Bay, WI 54235, USA;3. Wisconsin Department of Natural Resources, Office of Applied Sciences, 2801 Progress Rd., Madison, WI 53716, USA;4. Wisconsin Department of Natural Resources, Bureau of Fisheries Management, Peshtigo Service Center, 101 North Ogden Rd., Peshtigo, WI 54157, USA;5. Michigan Department of Natural Resources, Fisheries Division, Marquette Fisheries Research Station, 484 Cherry Creek Rd., Marquette, MI 49855, USA;6. U.S. Geological Survey, Wisconsin Cooperative Fishery Research Unit, University of Wisconsin-Stevens Point, 800 Reserve St., Stevens Point, WI 54481, USA;1. Cooperative Institute for Great Lakes Research, School for Environment and Sustainability, University of Michigan, Ann Arbor, MI 48109, USA;2. University of Minnesota Duluth, Duluth, MN 55812, USA;3. Fedwriters at National Oceanic and Atmospheric Administration, Great Lakes Environmental Research Laboratory, Ann Arbor, MI 48108, USA;1. National Oceanic and Atmospheric Administration, Great Lakes Environmental Research Laboratory, Lake Michigan Field Station, 1431 Beach St., Muskegon MI, 49441, USA;2. National Oceanic and Atmospheric Administration, Great Lakes Environmental Research Laboratory, 4840 S. State Rd., Ann Arbor, MI 48108, USA;1. Great Lakes Center, SUNY Buffalo State, 1300 Elmwood Avenue, Buffalo, NY 14222, USA;2. United States Environmental Protection Agency, Great Lakes National Program Office, Chicago, IL, USA;3. Alumnus, Great Lakes Laboratory for Fisheries and Aquatic Science, Fisheries and Oceans Canada, Burlington, Ontario L7R4A6, Canada;4. Aquatic Ecostudies Limited, 287 Miller Road, Dutton, Ontario N0L 1J0, Canada;1. New York State Department of Environmental Conservation, Lake Erie Fisheries Research Unit, 178 Point Drive North, Dunkirk, NY 14048, USA;2. Ontario Ministry of Natural Resources and Forestry, Trent University, 2140 East Bank Drive, Peterborough ON K9L 0G2, Canada;3. Great Lakes Acoustic Telemetry Observation System, Department of Fisheries and Wildlife, Michigan State University, 1405 South Harrison Road, East Lansing, MI 48824, USA;1. Department of Biology and Environmental Sciences, Heidelberg University, Tiffin, OH 44883, United States;2. National Center for Water Quality Research, Heidelberg University, Tiffin, OH 44883, United States |
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| Abstract: | Interspecific interactions among walleye Sander vitreus, lake whitefish Coregonus clupeaformis, and yellow perch Perca flavescens in Green Bay could influence the population status of each species, but potential trophic interactions are poorly understood. Our objectives were to determine if diet assemblages for each species and diet overlap among species varied spatially and temporally within Green Bay. Adult walleye (≥381 mm total length (TL); N = 981), lake whitefish (≥432 mm TL; N = 1507), and yellow perch (≥150 mm TL; N = 1174) were collected during May-October of 2018 and 2019 from multiple locations in southern and northern Green Bay. Diet assemblages of each species varied between northern and southern Green Bay, but walleye diets were more temporally variable (among months within zones and between years) than diets of lake whitefish or yellow perch. Lake whitefish represented a seasonally important prey item for walleye in southern Green Bay, composing 10 % and 41 % of walleye diets by weight in May and June, respectively. Yellow perch generally composed <15 % of walleye diets by weight but were consumed at a broader spatiotemporal scale than lake whitefish. Diet overlap between walleye and both lake whitefish and yellow perch was generally weak or moderate, whereas diet overlap between whitefish and perch was generally strong. Our assessment of adult trophic interactions suggests that changes in the population status of one species could influence fisheries for all three, and we identify additional research questions to address potential population-level effects of these trophic interactions. |
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| Keywords: | Walleye Lake whitefish Yellow perch Diet Diet overlap Green Bay |
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