http://worldcat.org/entity/work/id/180577067

Species richness and species occurrence of five taxonomic groups in relation to pH and other lake characteristics in southeast Canada

This paper presents research using recent databases from over 2,000 water bodies to determine the pH (acid/alkaline) range of occurrence and regional pH minima for various aquatic biota (zooplankton, macroinvertebrates, fish, amphibians, and water birds) in southern Ontario. Multivariate logistic and linear regression models are developed to predict the occurrence and taxonomic richness of certain broadly distributed taxa for use in current national acid rain modelling efforts. The paper initially presents pH ranges for specific species and groups, and using these ranges, it develops a theoretical species richness or proportional response distribution for several taxonomic groups. Multivariate approaches are used to examine the important factors which affect distribution of certain species. Finally, the paper discusses how species richness, or the number of species in a taxonomic group, is affected by key factors such as pH, water body size, and dissolved organic carbon content.

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