Microzooplankton standing crop in the western subtropical pacific off the Bonin Islands in winter, 1980

  • Yoshinari Endo
  • Hiroshi Hasumoto
  • Akira Taniguchi


Quantitative data on the vertical distribution and biomass of microzooplankton are presented for the western subtropical Pacific west of the Bonin Islands in winter. Microzooplankton other than foraminifera and radiolarians showed similar vertical distribution to chlorophylla. Among microzooplankters, naked ciliates, tintinnids and copepod nauplii were dominant components both in number and volume. Naked ciliates were the most dominant, comprising 82.2 % and 47.7 % of the total microzooplankton by number and volume, respectively. Copepod nauplii, occupying less than 10 % by number, accounted for 35.7 % of the volume of all microzooplankton. Tintinnids contributed less to the microzooplankton standing crop, 12.6 % of the total by number and 17.3 % by volume. Calculated microzooplankton wet weight varied from 0.84 to 1.80 g m−2 and corresponded to 9.9–18.1 % of net zooplankton weight. The relative abundance of microzooplankton to net zooplankton in this study is comparable to that previously reported in the tropical and subtropical Pacific Ocean, but a little higher than in oceanic subarctic areas.


Biomass Relative Abundance Quantitative Data Pacific Ocean Vertical Distribution 
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Copyright information

© the Oceanographical Society of Japan 1983

Authors and Affiliations

  • Yoshinari Endo
    • 1
  • Hiroshi Hasumoto
    • 2
  • Akira Taniguchi
    • 1
  1. 1.Faculty of AgricultureTohoku UniversitySendaiJapan
  2. 2.Ocean Research InstituteUniversity of TokyoTokyoJapan

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