Occurrence of Hybrids Between Longnose Sucker (Catostomus catostomus) and White Sucker (C. commersoni) in Upper Kananaskis Reservoir, Alberta

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Abstract
Hybrids between longnose sucker (Catostomus catostomus) and white sucker (C. commersoni), identified on the basis of intermediacy in several scale counts and in morphometric data, are recorded for the first time from Canada. The weakening of isolating mechanisms permitting hybridization was attributed to environmental factors, particularly species introduction and habitat disturbance. There was no evidence of swamping.

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