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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第69巻 第1号 >


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Title: 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
Other Titles: Zooplankton Size Structure in the Summer Western North Pacific Ocean: Analysis by Optical Plankton Counter
Authors: 三島, かおり1 Browse this author
松野, 孝平2 Browse this author →KAKEN DB
山口, 篤3 Browse this author →KAKEN DB
Authors(alt): Mishima, Kaori1
Matsuno, Kohei2
Yamaguchi, Atsushi3
Keywords: Zooplankton
Size structure
Optical plankton counter (OPC)
Normalized biomass size spectra (NBSS)
Issue Date: 7-Aug-2019
Publisher: 北海道大学大学院水産科学研究院
Journal Title: 北海道大学水産科学研究彙報
Journal Title(alt): Bulletin of Fisheries Sciences, Hokkaido University
Volume: 69
Issue: 1
Start Page: 37
End Page: 45
Abstract: 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.
Type: bulletin (article)
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第69巻 第1号

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