Slimy sculpin depth shifts and habitat squeeze following the round goby invasion in the Laurentian Great Lakes |
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| Affiliation: | 1. Quantitative Fisheries Center, Department of Fisheries and Wildlife, Michigan State University, 480 Wilson Rd., East Lansing, MI 48824, United States;2. U.S. Geological Survey Great Lakes Science Center, 1451 Green Road, Ann Arbor, MI 48105, United States;3. New York State Department of Environmental Conservation Cape Vincent Fisheries Station, Cape Vincent, NY, United States;4. Lake Ontario Management Unit, Glenora Fisheries Station, Ontario Ministry of Natural Resources and Forestry, Picton, Ontario, Canada;5. U.S. Geological Survey Great Lakes Science Center, Lake Ontario Biological Station, Oswego, NY, United States;1. Institut national de la recherche scientifique, Centre Eau Terre Environnement, Québec, QC G1K 9A9, Canada;1. School of Natural Resources & Environment, Lake Superior State University, 650 W. Easterday Ave., Sault Ste. Marie, MI 49783, USA;2. Center for Freshwater Research and Education, Lake Superior State University, 650 W. Easterday Ave., Sault Ste. Marie, MI 49783, USA;1. Rubenstein Ecosystem Science Laboratory, University of Vermont, Burlington, VT 05401, United States;2. Wisconsin Cooperative Fishery Research Unit, College of Natural Resources, University of Wisconsin – Stevens Point, 800 Reserve St. Stevens Point, WI 54481, United States;3. U.S. Geological Survey, Great Lakes Science Center, 1451 Green Road, Ann Arbor, MI 48105, United States;4. U.S. Geological Survey, Wisconsin Cooperative Fishery Research Unit, College of Natural Resources, University of Wisconsin‐Stevens Point, 800 Reserve St. Stevens Point, WI 54481, United States;5. National Oceanographic and Atmospheric Administration, National Marine Fisheries Service, Alaska Fisheries Science Center, Auke Bay Laboratories, 17109 Point Lena Loop Road, Juneau, AK 99801, United States;6. U.S. Geological Survey, Great Lakes Science Center, Lake Superior Biological Station, Ashland, WI 54806, United States;1. U.S. Geological Survey, Great Lakes Science Center, 1451 Green Road, Ann Arbor, MI 48105, USA;2. Department of Environmental Science, University of Toledo, 2801 West Bancroft Street, Toledo, OH 43606, USA;3. U.S. Environmental Protection Agency, Office of Research and Development, Great Lakes Toxicology and Ecology Division, Duluth, MN, USA;4. Department of Fisheries and Wildlife, Michigan State University, 480 Wilson Road, East Lansing, MI 48824, USA;1. Department of Biology, University of Vermont, 109 Carrigan Drive, Burlington, VT 05405, USA;2. Rubenstein Ecosystem Science Laboratory, University of Vermont, 3 College Street, Burlington, VT 05401, USA;3. U.S. Geological Survey, Great Lakes Science Center, Lake Superior Biological Station, 2800 Lake Shore Drive East, Ashland, WI 54806, USA;1. Department of Biology, University of Vermont, 109 Carrigan Drive, Burlington, VT 05405, USA;2. Rubenstein Ecosystem Science Laboratory, University of Vermont, 3 College Street, Burlington, VT 05401, USA;3. U.S. Geological Survey, Great Lakes Science Center, Lake Superior Biological Station, 2800 Lake Shore Drive East, Ashland, WI 54806, USA |
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| Abstract: | The collapse of Diporeia spp. and invasions of dreissenid mussels (zebra, Dreissena polymorpha; quagga, D. bugensis) and round goby (Neogobius melanostomus) have been associated with declines in abundance of native benthic fishes in the Great Lakes, including historically abundant slimy sculpin (Cottus cognatus). We hypothesized that as round goby colonized deeper habitat, slimy sculpin avoided habitat competition, predation, and aggression from round goby by shifting to deeper habitat. Accordingly, we predicted increased depth overlap of slimy sculpin with both round goby and deepwater sculpin (Myoxocephalus thompsonii) that resulted in habitat squeeze by both species. We used long-term bottom trawl data from Lakes Michigan, Huron, and Ontario to evaluate shifts in slimy sculpin depth and their depth overlap with round goby and deepwater sculpin. Lake Huron most supported our hypotheses as slimy sculpin shifted to deeper habitat coincident with the round goby invasion, and depth overlap between slimy sculpin and both species recently increased. Slimy sculpin depth trends in Lakes Michigan and Ontario suggest other ecological and environmental factors better predicted sculpin depth in these lakes. |
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| Keywords: | Invasive species Deepwater sculpin |
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