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Science 6 June 1969:
Vol. 164. no. 3884, pp. 1164 - 1167
DOI: 10.1126/science.164.3884.1164
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Articles

Recent Planktonic Foraminifera: Dominance and Diversity in North Atlantic Surface Sediments

William F. Ruddiman 1

1 Lamont-Doherty Geological Observatory, Palisades, New York 10968

Foraminferal dominance values above 50 percent and associated diversity minimums in surface sediments of the North Atlantic coincide with past extremes of temperature, productivity, or salinity in overlying surface waters. These parameters delimit a cold PolarSubpolar water mass and an impoverished, saline Southern Sargasso Central water mass for the late Recent. Anticipated pole-to-equator diversity and dominance gradients in the open ocean are virtually eliminated by the stronger trends of the vigorous subtropical North Atlantic gyre.


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