Author:
Barton D. R.,Carter J. C. H.
Abstract
The effects of exposure to wave action on the composition of shallow-water, epilithic invertebrate communities in eastern Georgian Bay were examined in May and July 1979. Samples were collected from stations which differed in depth (0–4 m), aspect, and type of underlying bedrock (granite or limestone). An index of exposure was calculated for each station based on fetch, proportion of winds in the previous month blowing toward the shore, and depth. Axis 1 derived from principal components analysis also ranked the stations in order of degree of exposure to wave action. Total abundance of invertebrates tended to decrease with increasing degree of exposure except at the most exposed stations in July where large numbers of two chydorid species were found. Number of taxa per site declined with increasing exposure in both months. There was no clear difference in the response to exposure between communities on granite and limestone. Dominant organisms included Copepoda, Chydoridae (Cladocera) (especially in July), Naididae (Oligochaeta), and Chironomidae (Diptera). The total abundance of invertebrates on bedrock was similar to values reported from mud and sand in other lakes.
Publisher
Canadian Science Publishing
Subject
Animal Science and Zoology,Ecology, Evolution, Behavior and Systematics
Cited by
38 articles.
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