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Science 2 February 1979:
Vol. 203. no. 4379, pp. 458 - 461
DOI: 10.1126/science.203.4379.458
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Articles

Biological Bulldozers and the Evolution of Marine Benthic Communities

CHARLES W. THAYER 1

1 Department of Geology, University of Pennsylvania, Philadephia 19174

During the Phanerozoic, the diversity of immobile suspension feeders living on the surface of soft substrata (ISOSS) declined significantly. Immobile taxa on hard surfaces and mobile taxa diversified. Extinction rates of ISOSS were significantly greater than in other benthos. These changes in the structure of benthic communities are attributed to increased biological disturbance of the sediment (bioturbation) by diversifying deposit feeders.

Submitted on May 12, 1978
Revised on September 26, 1978


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