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

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タイトル別名
  • The spatial and vertical distributions of a spring phytoplankton community along 155degE in the western North Pacific : An In Situ multi-excitation fluorometer analysis
  • セイブ キタタイヘイヨウ 155 ° Eセン ニ ソッタ シュンキ ショクブツ プランクトン グンシュウ ノ スイヘイ オヨビ エンチョク ブンプ : タハチョウレイキケイコウ コウドケイ ニ ヨル カイセキ
  • 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

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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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