Departmental Bulletin Paper 西部北太平洋155°E線に沿った春季植物プランクトン群集の水平および鉛直分布:多波長励起蛍光光度計による解析
The Spatial and Vertical Distributions of a Spring Phytoplankton Community along 155°E in the Western North Pacific : An In Situ Multi-Excitation Fluorometer Analysis

松本, 健太郎  ,  有馬, 大地  ,  松野, 孝平  ,  山﨑, 康裕  ,  大西, 広二  ,  大木, 淳之  ,  平譯, 享  ,  山口, 篤  ,  今井, 一郎

66 ( 1 )  , pp.29 - 38 , 2016-03-18 , 北海道大学大学院水産科学研究院
The spring phytoplankton community in the western North Pacific is characterized by large variability in both the horizontal and verical dimensions. To evaluate this variability, phytoplankton communitiesat 39°30'N-44°00'N along 155°E were investigated in situ using a multi-excitation fluorometer during May 2014. The sea surface chlorophyll a(Chi. a) level was high and composed mainly of diatoms near 43°30'N-42'N, while it was low and composed of dinoflagellates south of 40°N. Based on seven fixed-station investigations, the phytoplanklton communities were classified into 4 types : a low Chl. a level before bloom (44°N), massive diatom bloom(42°N-43°N), low Chl. a level with dinoflagellates(40°N-41°N) and lowest Chl.a(at the southernmost station at 39°30'N). These phytoplankton communities corresponded with the formation of a water mass separating the Subartctic front(SAF) and Subarctic boundary(SAB). Multi-excitation fluorometry data showed a high correlation with Chl. a measurements obtained via Thrmo-salinometer and biovolume microscopic analyses(r²=0.67-0.97,p<0.05). Thus, we concluded that a multi-excitation fluorometer can be applied for the evaluation of detailed spatial and temporal changes in the phytoplankton community at various locations.

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