Journal Article Spatial and geographical changes in the mesozooplankton community in the Bering and Chukchi Seas during the summers of 2007 and 2008

10 ( 3 )  , pp.335 - 345 , 2016-09
ISSN:18739652
Description
From July to August 2007 and June to July 2008, the horizontal/geographical changes in the zooplankton community in the Bering and Chukchi Seas were studied. The geographical patterns, which were common for these two years, were observed for salinity, chlorophyll a (Chl. a), zooplankton chaetognaths, hydrozoans and the whole zooplankton community. Among them, the patterns of salinity and Chl. a were related with the horizontal distribution of the water masses. The distributions of the two carnivorous taxa were correlated with their prey (copepods or barnacle larvae). The analysis of the structural equation model (SEM) revealed that the horizontal distribution of the zooplankton abundance and biomass were governed by the different taxa. Thus, the zooplankton abundance was governed by the numerically dominant but smaller-bodied taxa, such as the barnacle larvae and copepod Pseudocalanus spp., while the zooplankton biomass was determined by the large-bodied copepods, such as Calanus glacialis/marshallae and Eucalanus bungii.
2007年7−8月と2008年6−7月に南東部ベーリング海からチャクチ海にかけて動物プランクトン群集と各分類群の水平/地理分布を明らかにした。水平/地理分布として、両年とも共通して見られた項目は、塩分、Chl. a、ヤムシ類、クラゲ類および動物プランクトン群集構造であった。塩分はユーコン川河口で低く、Chl. aはチャクチ海南部で高く、これらは水塊構造の反映であると考えられた。肉食性の2分類群は、餌であるカイアシ類やフジツボ類幼生の個体数と正の相関があった。Structural Equation Model分析の結果、ベーリング海からチャクチ海における動物プランクトン群集の水平分布は、フジツボ類幼生や小型カイアシ類(Pseudocalanus spp.)の動態によって出現個体数が変化するのに対し、バイオマスは大型なカイアシ類(Calanus glacialis/marshallaeやEucalanus bungii)により変化することが明らかになった。

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