Surface distributions of copepods in relation to regional upwellings around the Izu Islands in summer of 1988 |
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| Authors: | Hideshige Toda |
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| Institution: | (1) Ecology Laboratory, Department of Botany, University of Tokyo, Hongo, Bunkyo-ku, 113 Tokyo, Japan;(2) Present address: Japan Marine Biological Research Institute, Co. Ltd., Yutaka-cho 4-3-16, Shinagawa-ku, 142 Tokyo, Japan |
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| Abstract: | Surface distributions of zooplankton were surveyed with simultaneous measurements of temperature, salinity, chlorophyll and nitrate, around the Izu Islands in July 1988. Several phytoplankton patches, which had developed in the upwelled waters, were encountered around the islands. Zooplankters collected with a 20µm mesh mainly consisted of copepods including eggs, nauplii, copepodites and adults.Paracalanus parvus dominated among the copepod females. High concentrations of all copepod stages were associated with the phytoplankton patches. The increase in reproductive activity of female copepods was considered as a possible process to form the copepod patches associated with the phytoplankton patches. |
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