Features of species composition and abundance of the nekton community in the upper epipelagic layer of the Northwest Pacific in early summer

Features of species composition and abundance of the nekton community in the upper epipelagic... The composition and structure of nekton in the upper epipelagic zone is considered based on the data of trawl surveys conducted in the Northwestern Pacific Ocean and adjacent waters in 2004–2009. Alterations in the nekton community during the early summer period, as well as peculiarities of its species composition and quantitative distribution that depend on changes in background conditions are described. In total, as many as 66 species of fish and 22 species of cephalopods were recorded in catches for the studied period. The lowest biodiversity was found in the near-shore waters (areas nos. 5, 7, and 9) and the highest one was in open oceanic waters (area no. 13). In 2004–2009, nekton biomass was formed mainly by mesopelagic species and their share amounted to 40–60% of the entire nekton community. Pacific salmon varied within 17–37% the total nekton biomass in various years. In general, for the period of studies, the mean biomass of nekton community was 2 431 000 tons, and in 2009, the total biomass approached this value. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Marine Biology Springer Journals

Features of species composition and abundance of the nekton community in the upper epipelagic layer of the Northwest Pacific in early summer

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Publisher
SP MAIK Nauka/Interperiodica
Copyright
Copyright © 2011 by Pleiades Publishing, Ltd.
Subject
Life Sciences; Freshwater & Marine Ecology
ISSN
1063-0740
eISSN
1608-3377
D.O.I.
10.1134/S1063074011070030
Publisher site
See Article on Publisher Site

Abstract

The composition and structure of nekton in the upper epipelagic zone is considered based on the data of trawl surveys conducted in the Northwestern Pacific Ocean and adjacent waters in 2004–2009. Alterations in the nekton community during the early summer period, as well as peculiarities of its species composition and quantitative distribution that depend on changes in background conditions are described. In total, as many as 66 species of fish and 22 species of cephalopods were recorded in catches for the studied period. The lowest biodiversity was found in the near-shore waters (areas nos. 5, 7, and 9) and the highest one was in open oceanic waters (area no. 13). In 2004–2009, nekton biomass was formed mainly by mesopelagic species and their share amounted to 40–60% of the entire nekton community. Pacific salmon varied within 17–37% the total nekton biomass in various years. In general, for the period of studies, the mean biomass of nekton community was 2 431 000 tons, and in 2009, the total biomass approached this value.

Journal

Russian Journal of Marine BiologySpringer Journals

Published: Jan 8, 2012

References

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