著者

鶴田 新生 上野 俊士郎 大貝 政治 山田 真知子

出版者

日本水産學會

雑誌

日本水産学会誌 (ISSN:00215392)

巻号頁・発行日

vol.53, no.1, pp.141-144, 1987

被引用文献数

2 5

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The seasonal and horizontal distributions of <i>Skeletonema costatum</i> (GREV.) CLEVE were observed five times in the surface water of Yatsushiro Sea, Kumamoto and Kagoshima Prefectures, from October 1983 to November 1984. Numerically, <i>S. costatum</i> was by far the most important phytoplankton, with two maxima in February and in August. In terms of cell number, this species amounts to more than 50% of the total phytoplankton whenever the community density is more than 10⁵ cells/<i>l</i>. The first maximum in February seems to be triggered by the release from zooplankton grazing pressure, since the high cell density of <i>S. costatum</i> and the high concentration of DIP were observed widely in Yatsushiro Sea. The second maximum in August seems to be attributed to the nutrients supplied through R. Kuma, since a marked horizontal gradient of <i>S. costatum</i> strongly related to those of salinity and DIP.