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セジメントトラップにより採集された初夏の西部北太平洋亜寒帯域におけるプランクトン群集の短期時系列変動

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Title: セジメントトラップにより採集された初夏の西部北太平洋亜寒帯域におけるプランクトン群集の短期時系列変動
Other Titles: Short-term changes in planktonic community of the western subarctic Pacific during early summer : analysis of sediment trap samples
Authors: 大橋, 理恵1 Browse this author
石井, 健一郎2 Browse this author
藤木, 徹一3 Browse this author
喜多村, 稔4 Browse this author →KAKEN DB
松本, 和彦5 Browse this author
本多, 牧生6 Browse this author →KAKEN DB
山口, 篤7 Browse this author →KAKEN DB
Authors(alt): Ohashi, Rie1
Ishii, Ken-ichiro2
Fujiki, Tetsuichi3
Kitamura, Minoru4
Matsumoto, Kazuhiko5
Honda, Makio C.6
Yamaguchi, Atsushi7
Keywords: Eucalanus bungii
Sagitta elegans
Sediment trap
Short-term changes
Western subarctic Pacific
Issue Date: 26-Aug-2011
Publisher: 日本プランクトン学会
Journal Title: 日本プランクトン学会報
Volume: 58
Issue: 2
Start Page: 123
End Page: 135
Abstract: To evaluate short-term changes in planktonic community, we analysed phytoplankton and zooplankton collected by a sediment trap moored at 150 m of St. K2 (47°N, 160°E) in the western subarctic Pacific with precision of two-day interval during 7 June to 1 July 2006. Phytoplankton flux varied from 480 to 372,290 cells m^-2 day^-1, and had a peak in 17-19 June. Phytoplankton community was composed of five diatom species and one silicoflagellate species. From Bray-Curtis cluster analysis, phytoplankton communities were classified into four groups. Zooplankton abundance ranged from 1,137 to 3,385 inds. m^-2 day^-1 and showed two peaks in 13-15 June and 21-23 June. Throughout the study period, large copepod Eucalanus bungii accounted 50-90% of total zooplankton abundance. Gonad maturation of adult females of E. bungii advanced during the study period: immature occurred before 15 June, developed during 19-27 June and newly recruited specimens to adult females were observed after 25 June. As carnivorous zooplankton, chaetognath community was predominated by Sagitta elegans (99.7% of total abundance). Body length of S. elegans ranged 22-39 mm, and the mean body length gradually increased during the study period (0.21 mm per day, r^2=0.72, p<0.01). Gonad maturation was also observed from immature stages in early June to mature stages in late June. As a characteristics of short-term changes in planktonic community, phytoplankton abundance fluctuated (max : min=780), while stable for zooplankton abundance (max : min=3). Species composition also greatly varied for phytoplankton than that in zooplankton. For zooplankton, development of juvenile and gonad maturation of adult were observed for both herbivores and carnivores. Thus, short-term changes during early summer of subarctic Pacific were characterized by phytoplankton succession in the abundance and species composition and rapid zooplankton growth in the development and maturity.
Rights: © 2011 日本プランクトン学会
Type: article
URI: http://hdl.handle.net/2115/52512
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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