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Vertical changes in abundance, biomass and community structure of copepods down to 3000 m in the southern Bering Sea

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Title: Vertical changes in abundance, biomass and community structure of copepods down to 3000 m in the southern Bering Sea
Authors: Homma, Tomoe Browse this author
Yamaguchi, Atsushi Browse this author →KAKEN DB
Keywords: Bathypelagic
Carcass
Deep-sea
Mesopelagic
Oxygen minimum layer
Issue Date: Aug-2010
Publisher: Elsevier
Journal Title: Deep Sea Research Part I : Oceanographic Research Papers
Volume: 57
Issue: 8
Start Page: 965
End Page: 977
Publisher DOI: 10.1016/j.dsr.2010.05.002
Abstract: Vertical changes in abundance, biomass and community structure of copepods down to 3000 m depth were studied at a single station of the Aleutian Basin of the Bering Sea (53°28'N, 177°00'W, depth 3779 m) on the 14th June 2006. Both abundance and biomass of copepods were greatest near the surface layer and decreased with increasing depth. Abundance and biomass of copepods integrated over 0-3000 m were 1,390,000 inds. m^[-2] and 5,056 mg C m^[-2], respectively. Copepod carcasses occurred throughout the layer, and the carcass:living specimen ratio was the greatest in the oxygen minimum layer (750-100 m, the ratio was 2.3). A total of 72 calanoid copepod species belonging to 34 genera and 15 families occurred in the 0-3000 m water column (Cyclopoida. Harpacticoida and Poecilostomatoida were not identified to species level). Cluster analysis separated calanoid copepod communities into 5 groups (A-E). Each group was separated by depth and the depth range of each group was at 0-75 m (A), 75-500 m (B), 500-750 m (C), 750-1500 m (D), and 1500-3000 m (E), respectively. Copepods were divided into four types based on the feeding pattern: suspension feeders, suspension feeders in diapause, detritivores and carnivores. In terms of abundance the most dominant group was suspension feeders (mainly Cyclopoida) in the epipelagic zone, and detritivores (mainly Poecilostomatoida) were dominant in the meso- and bathypelagic zones. In terms of biomass, suspension feeders in diapause (calanoid copepods Neocalanus spp. and Eucalanus bungii) were the major component (ca. 10-45%), especially in the 250-3000 m depth. These results are compared with the previous studies in the same region and that down to greater depths in the worldwide oceans.
Type: article (author version)
URI: http://hdl.handle.net/2115/43788
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山口 篤

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