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

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Science  13 Oct 1995:
Vol. 270, Issue 5234, pp. 275-277
DOI: 10.1126/science.270.5234.275


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.

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