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Science 13 October 1995:
Vol. 270. no. 5234, pp. 275 - 277
DOI: 10.1126/science.270.5234.275
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Reports

Molluscan Diversity in the Late Neogene of Florida: Evidence for a Two-Staged Mass Extinction

Edward J. Petuch

Analyses of recent data show that Floridian molluscan diversity declined markedly during the Pliocene-Pleistocene mass extinction. This decline in diversity was seen at all trophic levels, indicating a complete collapse of the ecosystem. These findings contradict the notion that there was a species diversity stasis throughout the Pliocene-Pleistocene and that the diversity of Pliocene Florida was equivalent to that of Recent Florida. The mass extinction was a two-staged, sequential event. A similar two-staged mass extinction occurred in the Miocene, indicating that two ecological catastrophes in quick geological succession may have produced this mass extinction as well.

Division of Geological Oceanography, Department of Geology, Florida Atlantic University, Boca Raton, FL 33431, USA. 


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