Changes in the frequency of the occurrence and abundance of ostracods (Ostracoda: Halocyprididae) in the epipelagic zone of the North Pacific

Changes in the frequency of the occurrence and abundance of ostracods (Ostracoda: Halocyprididae)... The structure of the epipelagic halocypridid ostracod fauna of the boreal zone of the northwestern Pacific has changed during the last 50–60 years. As a result, the frequency of occurrence and abundance of the traditionally most common cold-water species Discoconchoecia pseudodiscophora (Rudjakov, 1962) significantly decreased, while, in contrast, those of the previously rare and relatively warmth-loving Conchoecia sp. A increased to the level of common species. In 2009 and 2010, the position of the northern boundary of the Subarctic Front in this area in the period of biological spring already corresponded to its position at maximum water warming (biological summer) in the middle of the past century. Based on the ostracod distribution, the northern boundary of the Subarctic Front roughly corresponds to the position of a 10°C surface isotherm, and at the present time in the summer it lies further north than half a century ago. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Changes in the frequency of the occurrence and abundance of ostracods (Ostracoda: Halocyprididae) in the epipelagic zone of the North Pacific

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Publisher
Pleiades Publishing
Copyright
Copyright © 2015 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S1063074015030050
Publisher site
See Article on Publisher Site

Abstract

The structure of the epipelagic halocypridid ostracod fauna of the boreal zone of the northwestern Pacific has changed during the last 50–60 years. As a result, the frequency of occurrence and abundance of the traditionally most common cold-water species Discoconchoecia pseudodiscophora (Rudjakov, 1962) significantly decreased, while, in contrast, those of the previously rare and relatively warmth-loving Conchoecia sp. A increased to the level of common species. In 2009 and 2010, the position of the northern boundary of the Subarctic Front in this area in the period of biological spring already corresponded to its position at maximum water warming (biological summer) in the middle of the past century. Based on the ostracod distribution, the northern boundary of the Subarctic Front roughly corresponds to the position of a 10°C surface isotherm, and at the present time in the summer it lies further north than half a century ago.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Jul 7, 2015

References

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