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Biogeographic Consequences of Eurytopy and Stenotopy Among Marine Bivalves and Their Evolutionary Significance

J. B. C. Jackson
The American Naturalist
Vol. 108, No. 962 (Jul. - Aug., 1974), pp. 541-560
Stable URL: http://www.jstor.org/stable/2459685
Page Count: 20
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Biogeographic Consequences of Eurytopy and Stenotopy Among Marine Bivalves and Their Evolutionary Significance
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Abstract

Infaunal bivalves able to live in depths of 1 meter or less have significantly wider geographic distributions than infaunal bivalves restricted to deeper waters (not including deep-sea species). Shallower species tolerate a wider range of environmental conditions and probably have longer-lived larvae than species limited to depths greater than 1 meter. As a result of differences in geographic distribution, species able to live as shallow as 1 meter should be less likely to speciate or go extinct than species restricted to deeper waters. Low-diversity species associations (⩽ 1 meter) should therefore also be evolutionarily more stable than high-diversity (>1 meter) associations. These predictions are supported by evidence from the fossil record.

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