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Science 24 August 1984:
Vol. 225. no. 4664, pp. 829 - 830
DOI: 10.1126/science.225.4664.829
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Articles

Species Duration and Evolution: Benthic Foraminifera on the Atlantic Continental Margin of North America

MARTIN A. BUZAS 1 and STEPHEN J. CULVER 2

1 Department of Paleobiology, Smithsonian Institution, Washington, D.C. 20560
2 Department of Geological Sciences, Old Dominion University, Norfolk, Virginia 23508

Average species durations were estimated for 131 commonly occurring modern species. The duration of species occurring at depths of less than 200 meters is 16 million years, while for those at greater than 200 meters and at all depths it is 25 to 26 million years. Species (less than 200 meters) distributed from Florida to Newfoundland and from Florida to Cape Hatteras have about the same durations (18 to 20 million years). The duration for species restricted to north of Cape Hatteras is only 7 million years. The data suggest that evolutionary rates are greater in shallower than in deeper depths and greatest in the shallower northern area.

Submitted on January 23, 1984
Accepted on April 30, 1984


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