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Science 4 January 1985:
Vol. 227. no. 4682, pp. 60 - 63
DOI: 10.1126/science.227.4682.60
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Articles

Speciation and Stasis in Marine Ostracoda: Climatic Modulation of Evolution

THOMAS M. CRONIN 1

1 U.S. Geological Survey, Reston, Virginia 22092

Morphologic and paleozoogeographic analysis of Cenozoic marine Ostracoda from the Atlantic, Caribbean, and Pacific indicates that climatic change modulates evolution by disrupting long-term stasis and catalyzing speciation during sustained, unidirectional climatic transitions and, conversely, by maintaining morphologic stasis during rapid, high-frequency climatic oscillations. In the middle Pliocene, 4 to 3 million years ago, at least six new species of Puriana suddenly appeared as the Isthmus of Panama closed, changing oceanographic circulation and global climate. Since then morphologic stasis has characterized ancestral and descendant species during many glacial-interglacial cycles. The frequency and duration of climatic events have more impact on ostracode evolution than the magnitude of climatic changes.

Submitted on June 1, 1984
Accepted on October 17, 1984


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
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Paleobiology 30, 487-506
PATTERNS OF MORPHOLOGICAL DIVERSITY AMONG AND WITHIN ARCID BIVALVE SPECIES PAIRS SEPARATED BY THE ISTHMUS OF PANAMA.
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Journal of Paleontology 75, 590-606
MORPHOLOGY AND EVOLUTION OF THE LATE CENOZOIC MARINE BIOTA OF TROPICAL AMERICA: PREFACE.
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Journal of Paleontology 75, 473-474
Evolutionary consequences of changes in species' geographical distributions driven by Milankovitch climate oscillations.
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The Biological History of a Seaway.
G. J. Vermeij and G. J. Vermeij (1993)
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