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生物学
Assessing feeding competition between lake whitefish Coregonus clupeaformis and round whitefish Prosopium cylindraceum
<正> We collected lake whitefish Coregonus clupeaformis and round whitefish Prosopium cylindraceum from the mainbasin of Lake Huron and Georgian Bay in the Laurentian Great Lakes of North America to investigate details of diet and feedingtactics of these species in different seasons. Lake whitefish supports important commercial fisheries in Lake Huron and both speciesmake use of habitats near the Bruce Nuclear Power Development, on the eastern shore of Lake Huron. Most fish of bothspecies showed generalist feeding behavior, but some lake whitefish appeared to show specialist prey selection. The invasivespiny water flea Bythotrephes longimanus was an important component of the diet of both species. There was considerable dietaryoverlap between the whitefish species, but the ecological implications of these dietary overlaps are mitigated by the fact thatdominant prey species differed in most seasons. We conclude that the potential for ecologically significant interactions betweenlake whitefish and round whitefish resulting from competition for similar benthic food resources in the main basin of Lake Huronis probably low
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Current Zoology
2010年01期

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