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J. Moll. Stud. (1987), 53, 163-170
© The Malacological Society of London 1987

research-article

SPECIES RICHNESS OF FRESHWATER GASTROPOD COMMUNITIES IN CENTRAL NORTH AMERICA

EVA PIP

Department of Biology, University of Winnipeg Winnipeg, Manitoba, Canada R3B 2E9

Species richness of freshwater gastropod communities (SR) was examined at 429 sites in central North America. Lakes and rivers showed the highest SR values, as did habitats with organic substrates, shale and clay. SR was significantly correlated with species richness of aquatic macrophytes, particularly in lotic habitats. Of the 8 water chemistry variables examined, SR in the study area as a whole was significantly positively correlated with inorganic phosphorus, chloride, total alkalinity, total dissolved solids and pH, and inversely correlated with dissolved organic matter. Stepwise multiple regression analyses showed that contributions of the respective chemical variables varied in different types of water bodies. Different variables interacted in their effects on SR. In all cases more than half of the variability in SR remained unexplained by the chemical variables examined. Many factors apparently influence SR, their relative importance varying with situation.

(Received 24 October 1986;
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