On the Relation Between the Distribution, of Plankton and the Annual Changes of Sea Condition in Ise Bay

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  • 伊勢湾における海況変動とプランクトン分布について
  • イセワン ニ オケル カイキョウヘンドウ ト プランクトン ブンプ ニ ツイテ

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Abstract

This report deals with a relation between the seasonal changes of plankton and the sea conditions in Ise Bay based on the observations covering from Oct., 1950 to Dec., 1951.<BR>In Ise Bay less haline water which is affected by land drainages extends to southward from innermost part of the bay along the west coast, while haline water invades northward from the entrance to the eastern part of the bay. Distribution of both waters is shown by the horizontal distribution of chlorinity in the surface. The borders of both waters are usually found near the isohaline lines of 15 and 17 Cl‰, namely horizontal gradients of surface chlorinity becomes steep near the both isohaline lines in every month. The extentions of the waters are represented by the location of both isohaline lines in the bay. Distributions of phytoplankton have intimate relation with the one of chlorinity; accordingly, most abun-dant regions of various species appear separately in three regions - more than 17 Cl‰ 15-17 Cl‰ and less than 15 Cl ‰ - according to their responses for chlorinity. This division corresponds to following three groups in annual changes of phytoplankton appearrance: 1) Oceanic group. The species belonging to this group occur in most haline seasons at the sea area near the entrance of the bay. 2) Neritic group I. Main populations are found in the innermost part of the bay in haline seasons and in the sea near the entrance in less haline seasons. 3) Neritic group II. Usually appears near the innermost part of the bay. In some stenothermal species, however, the distributions are affected by the changes of temperature.<BR>In zooplankton, eury-haline neritic species and larvae of coastal benthic animals are dominant, because of extreme less haline of the water. Oceanic species appears only here and there in the invading water in most haline months from Oct. to Dec.

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