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沿岸親潮における動物プランクトン群集の特徴(シンポジウム:沿岸親潮)

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Title: 沿岸親潮における動物プランクトン群集の特徴(シンポジウム:沿岸親潮)
Other Titles: Characteristics of Zooplankton Community in the Coastal Oyashio Water(Symposium: "Coastal Oyashio")
Authors: 山口, 篤1 Browse this author →KAKEN DB
三輪, 喜之2 Browse this author
井上, 勝夫3 Browse this author
松本, 稔範4 Browse this author
志賀, 直信5 Browse this author →KAKEN DB
Authors(alt): Yamaguchi, Atsushi1
Miwa, Yoshiyuki2
Inoue, Katsuo3
Matsumoto, Toshikane4
Shiga, Naonobu5
Keywords: 沿岸親潮
動物プランクトン
かいあし類
Issue Date: 26-Aug-2003
Publisher: 日本海洋学会沿岸海洋研究会
Journal Title: 沿岸海洋研究
Volume: 41
Issue: 1
Start Page: 23
End Page: 31
Abstract: 北海道南東岸における沿岸親潮の動物プランクトン群集の特徴を明らかにするために,季節的,鉛直的および水平的なネット採集試料の解析を行った.沿岸親潮の流入は2月〜4月に見られ,これは当海域のバイオマスピーク(6月)の前であった.沿岸親潮と親潮接岸分枝ともに最優占分類群はかいあし類で,沿岸親潮中では小型冷水性かいあし類のPseudocalanus newmaniやAcartia longiremisが優占していた.水平的に動物プランクトン個体数とバイオマスはともに水温と正の相関があり,低水温の沿岸親潮中では低かった.これはバイオマスを左右する大型かいあし類の発育段階組成が沿岸親潮では休眠中の後期発育段階のみであったためであった.沿岸親潮の動物プランクトン群集のバイオマスが親潮接岸分枝よりも低い要因として,小型かいあし類が優占することや低温な環境下で成長が遅いこと,および珪藻類ブルームによるかいあし類の再生産効率の低下が影響していると考えられる.
Characteristics of mesozooplankton community in the Coastal Oyashio Water (COW) were analyzed based on zooplankton samples collected using 0.33mm mesh nets off the southeastern coast of Hokkaido. Intrusion of the COW was observed in February-April and that was earlier than the peak period of zooplankton biomass (419mg WM m^-3: 0-150m) in June (annual mean: 176mg WM m^-3). Copepods were the most dominant taxa (89±4% in abundance and 71±11% in biomass) throughout the study region. Numerically, small copepods (Pseudocalanus newmani and Acartia longiremis) predominated in the COW, whereas large copepods (Neocalanus spp. and Eucalanus bungii) did in the oceanic Oyashio water. Zooplankton abundance and biomass in the COW were lower than the adjacent oceanic Oyashio water. Low biomass in the COW was caused by the dominance of small-sized copepods and also by the predominance of only late copepodid stage in the COW in the stage composition of large-sized oceanic copepod E. bungii, that was distinct from that in the oceanic Oyashio water, i.e. more late copepodid stage, and predominance of early and middle copepodid stages. Slower growth rate of zooplankton in the COW due to low water temperature and negative effects of diatoms on reproductive success of copepods was considered as a possible cause for the low zooplankton biomass in the COW.
Type: article
URI: http://hdl.handle.net/2115/52560
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山口 篤

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