Abstract
A model for food competition that describes competition between two predator species consuming the same array of prey species was developed and applied to give equations for estimation of competition coefficients from observable data, and to examine the historical lake herring ( Coregonus artedii) and chub ( Coregonus hoyi) fisheries of Lake Superior. If the two species consume the same foods, and if food consumption and mortality are functions of size, the two species coexist. The analyses indicate three types of differences between species that could lead to competitive exclusion: different proportions of prey eaten, different efficiencies of food utilization, and different mortalities. Lake herring and chubs consumed similar foods, but lake herring were larger than chubs, and a difference in body size could result in exclusion of chubs from areas occupied by lake herring and lake trout because of the relation of mortality to size for pelagic species.
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