Title |
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ja
光学式プランクトンカウンターによる夏季の西部北太平洋における動物プランクトン群集のサイズ構造解析
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en
Zooplankton Size Structure in the Summer Western North Pacific Ocean: Analysis by Optical Plankton Counter
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Creator |
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ja
三島, かおり
en
Mishima, Kaori
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Accessrights |
open access |
Subject |
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Other
en
Zooplankton
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Other
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Abundance
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Other
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Biomass
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Other
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Size structure
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Other
en
Optical plankton counter (OPC)
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Other
en
Normalized biomass size spectra (NBSS)
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NDC
660
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Description |
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Abstract
en
To evaluate latitudinal and east-west changes in zooplankton abundance, biomass and size spectra, Optical Plankton Counter (OPC) measurements were made on zooplankton samples collected by vertical hauls of NORPAC net from 0-150 m depth at 35˚-46˚N along three north-south transects (144˚, 155˚, and 175˚30’E) in the western North Pacific during July-August of 2008 and 2009. Zooplankton abundance and biomass ranged at 4612-241,782 ind. m-2 and 0.05-23.09 g DW m-2, respectively. Zooplankton abundance and biomass were dominated by small-size class (0-1 mm equivalent spherical diameter [ESD]) in the subtropical region, while dominated by large-size class (1-2 and 2-3 mm ESD) in the transitional domain which caused by the dominance of large-sized copepods: Neocalanus spp. and Eucalanus bungii there. Inter-annual changes were observed for the 155˚E line: dominated by large size class (>5 mm ESD) in 2008 which caused by the dominance of Salpida. For size structure of zooplankton, analyses on normalized biomass size spectra (NBSS) were made. East-west differences were detected for the slope of NBSS. Thus, the slopes of NBSS were moderate for eastern lines (175˚30’E). This east-west gradient in NBSS slope may be related to the east-west gradient in primary productivity which related to east-west differences in the magnitude of iron supply from dust. Overall, NBSS slope in the western North Pacific was characterized by moderate and highly variable. It would be related to pulse-like input of nutrient (=sporadic peak of primary productivity) and dominance of large- gelatinous zooplankton. These two factors are considered to be a special characteristic of the plankton community in summer of the western North Pacific.
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Publisher |
ja
北海道大学大学院水産科学研究院
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Date |
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Language |
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Resource Type |
departmental bulletin paper |
Version Type |
VoR |
Identifier |
DOI
https://doi.org/10.14943/bull.fish.69.1.37
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HDL
http://hdl.handle.net/2115/75197
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ID |
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JaLC
10.14943/bull.fish.69.1.37
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Journal |
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PISSN
1346-1842
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NCID
AA11547977
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ja
北海道大学水産科学研究彙報
en
Bulletin of Fisheries Sciences, Hokkaido University
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Volume Number69
Issue Number1
Page Start37
Page End45
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File |
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Oaidate |
2023-07-26 |