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Science 7 August 1998:
Vol. 281. no. 5378, pp. 807 - 809
DOI: 10.1126/science.281.5378.807
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Reports

Decoupled Temporal Patterns of Evolution and Ecology in Two Post-Paleozoic Clades

Frank K. McKinney, * Scott Lidgard, J. John Sepkoski Jr., Paul D. Taylor

Counts of taxonomic diversity are the prevailing standards for documenting large-scale patterns of evolution in the fossil record. However, the secular pattern of relative ecological importance between the bryozoan clades Cyclostomata and Cheilostomata is not reflected fully in compilations of generic diversity or within-fauna species richness, and the delayed ecological recovery of the Cheilostomata after the mass extinction at the Cretaceous-Tertiary boundary is missed entirely. These observations demonstrate that evolutionary success and ecological dominance can be decoupled and profoundly different, even over tens of millions of years.

F. K. McKinney, Department of Geology, Appalachian State University, Boone, NC 28608-2067, USA. S. Lidgard, Department of Geology, Field Museum, Roosevelt Road at Lake Shore Drive, Chicago, IL 60605, USA. J. J. Sepkoski Jr., Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, USA. P. D. Taylor, Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, UK.
*   To whom correspondence should be addressed. E-mail: mckinneyfk{at}appstate.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)