Abstract
In the LaCloche Mountains of Ontario, 11 lakes spanning the pH range 4.8 to 6.7 were sampled for benthic organisms. Sixty sediment cores were collected from each lake, organisms >0.5 mm were separated and 25 taxa were identified. The number of taxa present was correlated negatively with [H+]: Y=23.2–4.27 × 10 5; r2 =0.61, p<0.005. The density of all organisms was not correlated with lake pH. Six taxa: gastropods, pelecypods, daphnids, ephemeropterans, amphipods and ceratopogonids, either were reduced in abundance or absent from the more acid lakes. Bosminids and acari were more abundant in lakes of pH 5.0 to 5.5. The densities of the remaining taxa, notably chironomids and oligochaetes, appeared to be independent of pH over the range 4.4 to 6.7. These results are discussed in relation to the hypotheses which have been advanced to explain the differences observed in benthos distribution between lakes in Europe and in North America.
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Harvey, H.H., McArdle, J.M. (1986). Composition of the Benthos in Relation to pH in the LaCloche Lakes. In: Martin, H.C. (eds) Acidic Precipitation. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-3385-9_52
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DOI: https://doi.org/10.1007/978-94-009-3385-9_52
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