Abstract
The chironomid fauna was examined in two basins of Pasqua Lake, southeastern Saskatchewan, to assess the degree of eutrophication and the possible impact of contaminants. The western basin yielded (n=354) 12 taxa with a mean larval density of 8,673 ind.m−2. Chironomus spp. made up 79.4% of the larvae and 2.26% of the larvae were deformed. The degree of trophy was assessed ν or eutrophic. The eastern basin yielded (n=32) five taxa with a mean larval density of 182 ind.m−2. Paratendipes sp. predominated and 3.13% of the larvae were deformed. Although the community did not fit traditional trophic classification indices, the basin was tentatively assessed ξ or strongly eutrophic. The effects of contaminants are suspected of modifying the response of the chironomid communities to trophic parameters in the eastern basin.
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