Biogeographic Zonation of the Nannoplankton
of the Southern Ocean in the Pliocene

O. B. Dmitrenko

Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia

Received September 7, 2000; in final form, November 27, 2000

Abstract—Two schematics of biogeographic zonation for the Early and Late Pliocene bottom sediments of the
Southern Ocean were compiled based on the data on calcareous nannoplankton from the cores obtained within
the DSDP and ODP deep-sea drilling programs. Consideration of about 50 habitats of species and genera and
assessment of the changes in the coccolith number over the area and paleoecological groups of species enabled
four zones to be distinguished: polar (Antarctic), subpolar (Subantarctic), moderate (notal), and subtropical.
The migrations of the zones during the Pliocene and climatic changes in selected areas of the Southern Ocean
are marked.

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