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Equatorward migration of Globorotalia truncatulinoides ecophenotypes through the Late Pleistocene: Gradual evolution or ocean change?

Published online by Cambridge University Press:  08 April 2016

G. P. Lohmann  and
Björn A. Malmgren
G. P. Lohmann
Affiliation:
Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543
Björn A. Malmgren
Affiliation:
University of Stockholm, Box 6801, S-113 86 Stockholm, Sweden
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Abstract

The biogeography of differences in average shape of the modern planktonic foraminifer Globorotalia truncatulinoides (d'Orbigny) exhibits systematic relationships to changes in the ocean's surface environment. Comparison of these shape changes, as they exist today in the Southern Hemisphere, with fossil shapes preserved in a Late Pleistocene record from the South Atlantic Ocean, shows that the biogeography of G. truncatulinoides ecophenotypes has changed markedly through time. Beginning at least 700,000 yr ago and continuing up to the present, there has been a gradual but clear migration of certain morphotypes of G. truncatulinoides toward lower latitudes. The history of this migration bears no simple relationship to the cyclic climatic changes that characterize the Late Pleistocene. We conclude that either (1) phenotypic variants of Gr. truncatulinoides reflect some previously unmeasured, gradually changing aspect of Late Pleistocene oceans, or (2) we are witnessing a gradual evolution of the environment preferences of G. truncatulinoides.

Type
Articles
Information
Paleobiology , Volume 9 , Issue 4 , Fall 1983 , pp. 414 - 421
Copyright
Copyright © The Paleontological Society 

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