Further studies on the feeding habits ofSagitta nagae
alvariño in Suruga Bay,central Japan |
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| Authors: | Sachiko Nagasawa Ryuzo Marumo |
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| Institution: | (1) Ocean Research Institute, University of Tokyo, Minamidai, Nakano-ku, 164 Tokyo, Japan |
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| Abstract: | The feeding ofSagitta nagae was analyzed in connection with food chains in the pelagic and near-bottom communities of Suruga Bay. The following results are obtained: (1)S. nagae feeds on dominant copepod species both in the free water (upper water layers) and the near-bottom habitats; (2)S. nagae did not show any food-size selection in the range of 0.2 to 1.2 mm in cephalothorax width and height of copepods; (3) Feeding activity ofS. nagae in the free water is highest at night, while in the near-bottom habitat the species feeds more actively during the day than at night; and (4)S. nagae migrates between the bottom and free water and plays an important role in shallow water by connecting the near-bottom community with the pelagic community. |
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