赤潮の生理生態学的研究-1-

概要

論文の詳細を見る
P ysiological and ecological studies on red tide have been made in laboratory as well as in field. In this paper the vertical migration of the plankton producing red tide has bean investigated. The plankton organism Sennia sp. collected from the red tide in Maizuru Bay (November, 1956) has mainly been used as the material in laboratory and following results have been obtained. 1) When a part of the water mass of red tide was brought in laboratory, the plankton organisms found within it usually sank to the bottom of a vessel and then came mostly to death. However, these sinking and death were kept in check by putting a proper number of pearl oys-ters Pteria martensii (DUNKER) in the material, adding the ordinary sea water of bottom layer in it, and so on. 2) Strong light, high salinity, oxygen unsaturation, and low pH seem to increase a buoyancy of the plankton; and, the inverse states of them, fall of temperature and strong shock seem to increase the tendency of sinking of it. 3) The vertical migration of the plankton might be caused mainly by decrease of dissolved oxygen and increase of light in the morning, and by the inverse states of both in the evening. 4) It has often been observed that the plankton producing red tide were extraordinarily concentrated in the surface layer (Table) and formed the mass of discolored water along the coast or at the corners of a bay. These phenomena seem to be mainly based on that the plankton increases its buoyancy according to increase of light and recovery of salinity after much rain, and that the plankton which has come together to the water surface by such a buoyancy is further concentrated, wafted on the skin current caused by wind. As for the mechanism of vertical migration, few studies have been done. It will be discussed in the future papers.
社団法人日本水産学会の論文

赤潮の生理生態学的研究-1-

スポンサーリンク

概要

著者

関連論文

スポンサーリンク