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Seasonal variability of zooplankton size spectra at Mombetsu Harbour in the southern Okhotsk Sea during 2011: An analysis using an optical plankton counter

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Title: Seasonal variability of zooplankton size spectra at Mombetsu Harbour in the southern Okhotsk Sea during 2011: An analysis using an optical plankton counter
Authors: Hikichi, Hikaru Browse this author
Arima, Daichi Browse this author
Abe, Yoshiyuki Browse this author
Matsuno, Kohei Browse this author →KAKEN DB
Hamaoka, Soshi Browse this author
Katakura, Seiji Browse this author
Kasai, Hiromi Browse this author
Yamaguchi, Atsushi Browse this author →KAKEN DB
Issue Date: Apr-2018
Publisher: Elsevier
Journal Title: Regional Studies in Marine Science
Volume: 20
Start Page: 34
End Page: 44
Publisher DOI: 10.1016/j.rsma.2018.03.011
Abstract: To evaluate the temporal changes in zooplankton size spectra, optical plankton counter (OPC) measurements were made of high-frequency time-series zooplankton samples collected at approximately 3.5-day intervals in Mombetsu Harbour, which is located in the southern Okhotsk Sea, from January to December 2011. Based on biomasses of 47 equivalent spherical diameter (ESD) size classes binned at 0.1 mm intervals across 0.35-5 mm, the Bray-Curtis similarity index separated the zooplankton community into six groups (A-F). The occurrence of each group was separated seasonally. Thus, groups A and B were observed during the ice-covered season and summer season, respectively. During March and June, groups C-F were observed. Their occurrence varied in the short term in relation to the exchange of water masses. Groups A and C, which were observed from January to April, showed flatter normalized biomass size spectra (NBSS) slopes ( -0.85 to -1.1), which indicate low productivity. In contrast, the other groups showed steeper slopes (-1.31 to -1.52) from May to December, with high productivity. Throughout the year, the frequency of highly productive groups occurred at a high level (95.2%). Although the seasonal variability in zooplankton size and productivity in Mombetsu Harbour was mainly governed by water mass exchanges, the productivity was continuously high throughout nearly all of the one-year study period. (C) 2018 Published by Elsevier B.V.
Rights: © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
https://creativecommons.org/licenses/by-nc-nd/4.0/
Type: article (author version)
URI: http://hdl.handle.net/2115/77219
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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