Abstract
The cyprinid species, and physical and chemical characteristics were recorded from 58 small lakes in the Algoma district of northern Ontario. A group of typical stream-dwelling lithophilous species, which included common shiner, Notropis cornutus, creek chub, Semotilus atromaculatus, and blacknose dace, Rhinichthys atratulus, tended to occupy lakes of larger than average drainage areas. Phoxinus spp., pearl dace, Semotilus margarita, and fathead minnow, Pimephales promelas, occurred commonly in lakes with small drainage areas, and the average drainage area of lakes they occupied was near or below the overall average. Lakes without stream cyprinids were discriminated from lakes with them on a combination of chemical variables, including pH, alkalinity and calcium, which indicated that they were more susceptible to anthropogenic acidification.
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