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Assessing feeding competition between lake whitefish Coregonus clupeaformis and round whitefish Prosopium cylindraceum

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Current Zoology 2010年第1期56卷 109-117页

作者： Andrew MACPHERSON John A.HOLMES Andrew M.MUIR David L.G.NOAKES Axelrod Institute of Ichthyology and Department of Zoology University of Guelph Faculty of Architecture Landscape and Design University of Toronto Pacific Biological Station Fisheries and Oceans Canada Golder Associates Fisheries and Wildlife Department and Oregon Hatchery Research Center Oregon State University

We collected lake whitefish Coregonus clupeaformis and round whitefish Prosopium cylindraceum from the main basin of Lake Huron and Georgian Bay in the Laurentian Great Lakes of North America to investigate details of diet and feeding tactics of these species in different seasons. Lake whitefish supports important commercial fisheries in Lake Huron and both species make use of habitats near the Bruce Nuclear power Development, on the eastern shore of Lake Huron. Most fish of both species showed generalist feeding behavior, but some lake whitefish appeared to show specialist prey selection. The invasive spiny water flea Bythotrephes longimanus was an important component of the diet of both species. There was considerable dietary overlap between the whitefish species, but the ecological implications of these dietary overlaps are mitigated by the fact that dominant prey species differed in most seasons. We conclude that the potential for ecologically significant interactions between lake whitefish and round whitefish resulting from competition for similar benthic food resources in the main basin of Lake Huron is probably low [Current Zoology 56 （1）： 109-117, 2010].

关键词： Lake Huron Diet Feeding tactics Seasonal variation Invasive species

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