Short-term changes in planktonic community of the western subarctic Pacific during early summer : analysis of sediment trap samples

• Ohashi, Rie

• Ishii, Ken-ichiro

• Fujiki, Tetsuichi

• Kitamura, Minoru

• Matsumoto, Kazuhiko

• Honda, Makio C.

• Yamaguchi, Atsushi

Bibliographic Information

Other 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
• セジメントトラップ ニ ヨリ サイシュウ サレタ ショカ ノ セイブ キタタイヘイヨウ アカンタイイキ ニ オケル プランクトン グンシュウ ノ タンキ ジケイレツ ヘンドウ

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.

Journal

• 日本プランクトン学会報

  日本プランクトン学会報 58 (2), 123-135, 2011-08-26

  日本プランクトン学会

Keywords

• Eucalanus bungii
• Sagitta elegans
• Sediment trap
• Short-term changes
• Western subarctic Pacific

Details

• CRID: 1050282677904434560
• NII Article ID: 10029655054
• NII Book ID: AN00197015
• HANDLE: 2115/52512
• NDL BIB ID: 11281893
• ISSN: 03878961
• Web Site: https://agriknowledge.affrc.go.jp/RN/2010814386
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I11281893
• Text Lang: ja
• Article Type: journal article
• Data Source:
  • IRDB
  • NDL
  • CiNii Articles
  • KAKEN