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Science 22 October 1976:
Vol. 194. no. 4263, pp. 422 - 424
DOI: 10.1126/science.194.4263.422
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Articles

Ecologic and Paleoclimatic Implications of Morphologic Variation of Orbulina universa in the Indian Ocean

ALAN D. HECHT 1, ALLAN W. H. BÉ 2, and LEROY LOTT 2

1 Department of Geology, West Georgia College, Carrollton 30117
2 CLIMAP, Columbia University, Lamont-Doherty Geological Observatory, Palisades, New York 10964

Multivariate cluster analysis of various morphologic indices of Orbulina universa populations from the Indian Ocean indicate the existence of two major groups whose geographic distribution corresponds to the equatorial and central water masses. An abrupt change in shell porosity between populations of this planktonic foraminiferal species in plankton as well as sediment samples occurs within or near the 10°S Hydrochemical Front. Orbulina universa is an excellent indicator of oceanographic conditions in the Indian Ocean today, and may be used as an independent check on shifts in water masses during the last glaciation.

Submitted on March 18, 1976
Revised on July 23, 1976


THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Molecular evidence of cryptic speciation in planktonic foraminifers and their relation to oceanic provinces.
C. de Vargas, R. Norris, L. Zaninetti, S. W. Gibb, and J. Pawlowski (1999)
PNAS 96, 2864-2868
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Glacial-Holocene Transition in Deep-Sea Carbonates: Selective Dissolution and the Stable Isotope Signal.
W. H. Berger, W. H. BERGER, and J. S. KILLINGLEY (1977)
Science 197, 563-566
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Science. ISSN 0036-8075 (print), 1095-9203 (online)