Journal Article

Metabolism and chemical composition of mesopelagic ostracods in the western North Pacific Ocean

Hideki Kaeriyama and Tsutomu Ikeda

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 61, issue 4, pages 535-541
Published in print January 2004 | ISSN: 1054-3139
Published online January 2004 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/j.icesjms.2004.03.009
Metabolism and chemical composition of mesopelagic ostracods in the western North Pacific Ocean

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Oxygen consumption rates and bodily elemental composition (carbon (C) and nitrogen (N)) were determined on three dominant ostracods (Discoconchoecia pseudodiscophora, Orthoconchoecia haddoni, and Metaconchoecia skogsbergi) from the mesopelagic zone of the Oyashio region. Specific oxygen consumption rates of the three species at near in situ temperature (3°C) were similar (0.39 μl O2 mg DW−1 h−1), but bodily C composition and C:N ratios of D. pseudodiscophora were significantly higher than those of the other two species. Metabolic comparison in terms of “daily body C loss” or “adjusted metabolic rate” revealed that metabolic rates of the ostracods are 0.3–0.4 times those of other zooplankton at comparable temperature conditions. The present results were combined with standing stock data of each ostracod in the Oyashio region to estimate their POC ingestion. Our calculation indicates annual ingestion by the ostracods to be 875 mgC m−2 yr−1, which equates to 3.7% of annual POC flux reaching 200–600-m depth (mid-point: 400-m depth) in this region.

Keywords: C:N ratio; mesopelagic; ostracods; oxygen consumption; Oyashio region

Journal Article.  3875 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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