Oceanographic conditions associated with high abundances of the radiolarian Cycladophora davisiana

Details Oceanographic conditions associated with high abundances of the radiolarian Cycladophora davisiana Oceanographic conditions associated with high abundances of the radiolarian Cycladophora davisiana

Dec 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..66...63m&link_type=abstract

Earth and Planetary Science Letters, Volume 66, p. 63-72.

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Scientific paper

The cosmopolitan radiolarian Cycladophora davisiana usually comprises less than 5% of the radiolarian fauna in Holocene sediments. In recent sediments from the Sea of Okhotsk, however, this species frequently represents more than 20% of the radiolarian assemblage. At times during the late Pleistocene, abundances of this species in excess of 40% are recorded in marine sediments from high-latitude oceans (>40°) of both hemispheres. The Sea of Okhotsk apparently represents a modern analogue of climatic and oceanographic conditions that existed throughout large portions of high-latitude oceans at times during the late Pleistocene.
The near-surface water structure of the Sea of Okhotsk is characterized by a low-salinity surface layer with a strong temperature minimum near its base. The low surface salinities are responsible for maintaining near-freezing subsurface temperatures as well as establishing relatively stable temperatures and salinities at depths below the temperature minimum. This water structure is produced, at least in part, by intense freezing of sea ice in winter with subsequent summer melting. The physical characteristics of the upper water column affect the abundance and activity of shallow-dwelling flora and fauna, while providing a stable subsurface environment for deeper-dwelling fauna.
Also, Department of Geological Sciences, Columbia University in the City of New York, New York, NY 10027 (U.S.A.).

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