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Quantitative Analysis of Ostracoda and Water Masses around Japan: Application to Pliocene and Pleistocene Paleoceanography

Noriyuki Ikeya and Thomas M. Cronin
Micropaleontology
Vol. 39, No. 3 (Autumn, 1993), pp. 263-281
DOI: 10.2307/1485900
Stable URL: http://www.jstor.org/stable/1485900
Page Count: 19
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Quantitative Analysis of Ostracoda and Water Masses around Japan: Application to Pliocene and Pleistocene Paleoceanography
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Abstract

An ostracode data base consisting of 273 samples from coretops and comprising 226 species was developed for the seas around the Japanese Islands to determine zoogeographic patterns and for application to Pliocene and Pleistocene paleoceanography in the area. Quantitative analyses of the 59 most common taxa between 0 and 300m water depth indicate that ostracode associations are controlled by the main oceanic water masses around Japan and that bottom water temperature is a key factor influencing species distributions. Ostracodes from the following water masses were studied: warm Kuroshio Current, Tsushima Current (Tsugaru Current and Soya Current), Japan Sea intermediate water, Japan Sea proper water and cold Oyashio Current. In order to apply the modern coretop data base to fossil ostracode assemblages, the modern analog technique (MAT) using a squared chord distance (SCD) measure of dissimilarity was tested as a means of comparing fossil and modern assemblages. SCD values of 0.25 or less adequately identify modern analogs from the coretop data set at the local ecological level (i.e. within the same modern bay), while values of 0.25-0.5 identify modern analogs at the level of the zoogeographic province. The MAT method was tested against 3 Pliocene and 11 Pleistocene formations in Japan to examine the use of the MAT in paleoceanographic reconstruction.

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