Seasonal Variations of Plankton Food Web Structure in the Coastal Water off Usujiri Southwestern Hokkaido, Japan
Seasonal Variations of Plankton Food Web Structure in the Coastal Water off Usujiri Southwestern Hokkaido, Japan
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DOI：
10.1007/s10872-005-0072-9
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发表时间：
2005-08
影响因子：
2.3
通讯作者：
A. Shinada;S. Ban;Yuichiro Yamada;T. Ikeda
中科院分区：
文献类型：
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作者：
A. Shinada;S. Ban;Yuichiro Yamada;T. Ikeda
1997年6月至1999年6月，基于微藻(<；2；m)、纳米(2-10µm)、微型(10-200µm)和中浮游动物(>；200µm)的季节生物量数据，并用结构方程模型(SEM)进行通径分析，研究了日本北海道西南部Usujiri附近亚北极沿岸水域浮游食物网的结构。在春季，微型浮游植物由于硅藻水华而占优势，而微藻和超微浮游植物在除1997年11月和12月以外的其他季节占优势。异养浮游生物与浮游植物大小分布的季节变化基本一致，春季中浮游动物生物量较高。通径分析表明，微生物食物网中的主要途径可能会根据浮游植物的大小组成而变化，这不仅表明了经典食物链(微型浮游植物-桡足类)，也表明了间接途径(微型浮游植物-裸露的甲藻-桡足类)。
The planktonic food web structure in the subarctic coastal water off Usujiri south-western Hokkaido, Japan was investigated from June 1997 to June 1999, based on seasonal biomass data of pico- (<2 µm), nano- (2–10 µm), micro- (10–200 µm) and mesoplankton (>200 µm), and path analysis using the structural equation model (SEM). In spring, microphytoplankton predominated due to diatom bloom, while pico- and nanophytoplankton predominated in the other seasons, except November and December 1997. The seasonal change in size distribution of heterotrophic plankton was almost similar to that of phytoplankton, and mesozooplankton biomass was high in spring. The path analyses suggest that the main channel in the microbial food web could vary according to phytoplankton size composition, indicating not only the classical food chain (microphytoplankton - copepods) but also the indirect route (microphytoplankton - naked dinoflagellates - copepods).