2024-03-29T14:51:46Zhttps://eprints.lib.hokudai.ac.jp/dspace-oai/requestoai:eprints.lib.hokudai.ac.jp:2115/610522022-11-17T02:08:08Zhdl_2115_60980hdl_2115_21524hdl_2115_141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Chl. a sensorDiatomDinoflagellateMulti-excitation fluorometerPhytoplanktonSpring bloom660The 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.北海道大学大学院水産科学研究院Departmental Bulletin Paperapplication/pdfhttp://hdl.handle.net/2115/61052info:doi/10.14943/bull.fish.66.1.29https://eprints.lib.hokudai.ac.jp/dspace/bitstream/2115/61052/1/bull.fish.66.1.29.pdf1346-1842AA11547977北海道大学水産科学研究彙報66129382016-03-18jpnpublisher