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Science 9 December 1983:
Vol. 222. no. 4628, pp. 1123 - 1125
DOI: 10.1126/science.222.4628.1123
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Articles

Onshore-Offshore Patterns in the Evolution of Phanerozoic Shelf Communities

DAVID JABLONSKI 1, J. JOHN SEPKOSKI JR. 2, DAVID J. BOTTJER 3, and PETER M. SHEEHAN 4

1 Department of Ecology and Evolutionary Biology, University of Arizona, Tucson 85721
2 Department of Geophysical Sciences, University of Chicago, Chicago, Illinois 60637
3 Department of Geological Sciences, University of Southern California, Los Angeles 90007
4 Department of Geology, Milwaukee Public Museum, Milwaukee, Wisconsin 53233

Cluster analysis of Cambrian-Ordovician marine benthic communities and community-trophic analysis of Late Cretaceous shelf faunas indicate that major ecological innovations appeared in nearshore environments and then expanded outward across the shelf at the expense of older community types. This onshoreinnovation, offshore-archaic evolutionary pattern is surprising in light of the generally, higher species turnover rates of offshore clades. This pattern probably results from differential extinction rates of onshore as compared to offshore clades, or from differential origination rates of new ecological associations or evolutionary novelties in nearshore environments.

Submitted on June 13, 1983
Accepted on October 22, 1983


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