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珪藻Skeletonema costatumとMelosira moniliformisの大きさの季節的変化


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Title: 珪藻Skeletonema costatumとMelosira moniliformisの大きさの季節的変化
Other Titles: Seasonal Variation of Cell Size in Skeletonema costatum and Melosira moniliformis
Authors: 右田, 清治
Authors (alternative): Migita, Seiji
Issue Date: Aug-1969
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.27, pp.9-17; 1969
Abstract: Many diatoms decrease their cell size in the vegetative reproduction as a result of their interpolatory mechanism of wall formation. When the cells are reduced to a certain size, they become sexual and generally return to a larger size by auxospore formation. Consequently, even in the same species, there is a great difference in cell size as well as seasonal variation. The author studied on the seasonal variation of cell size in Skeletonema costatum and Melosira moniliformis occurring at the coast of Nagasaki. The seasonal occurrence of various cell size in these species is shown in Figs. 1 and 2. In S. costatum, planktonic species, and M. moniliformis, epiphytic species, small cells increase in winter, whilst large cells increase in spring and autumn. The mean cell diameters of both species decrease in winter and increase in summer and autumn (Figs. 3 and 4). In the natural habitats, the optimum temperature for auxospore formation, i. e., about 20℃ as indicated by experimental data, is seen during the period from May to June, and from September to October. It is believed that the favourable temperature in these seasons is advantageous to the enlargement of cells. / 長崎湾内の浮遊性珪藻S costatumと東長崎八郎川汽水域の付着性珪藻M moniliformisを1966年4月から1968年3月まで毎月採集して,両種の大きさの季節的変化を調べた 1 S costatum,M moniliformisともに冬に小型群が増加し,春と秋に大型群が出現する. 2 各月の最小細胞群の直径の変異は最大群の変異に比べて少ない. 3 両種の平均細胞直径は,冬に縮小し,春から増大し,夏から秋に最大の大きさになる変化を示した. 4 海における大きさの季節的変化は増大胞子形成の要因,とくに海水温との関係が深いようである.
URI: http://hdl.handle.net/10069/31273
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第27号

Citable URI : http://hdl.handle.net/10069/31273

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