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タイトル	en Distribution of Arctic and Pacific copepods and their habitat in the northern Bering and Chukchi seas
作成者	en Sasaki, Hiroko en Matsuno, Kohei NRID 1000090712159 en Fujiwara, Amane NRID 1000000756489 en Onuka, Misaki en Yamaguchi, Atsushi NRID 1000050344495 en Ueno, Hiromichi NRID 1000090421875 en Watanuki, Yutaka NRID 1000040192819 en Kikuchi, Takashi NRID 1000030359153
アクセス権	open access
権利情報	en http://creativecommons.org/licenses/by/3.0/ http://creativecommons.org/licenses/by/3.0/ en Creative Commons Attribution 3.0 Unported
主題	NDC 660
内容注記	Abstract en The advection of warm Pacific water and the reduction in sea ice in the western Arctic Ocean may influence the abundance and distribution of copepods, a key component of food webs. To quantify the factors affecting the abundance of copepods in the northern Bering and Chukchi seas, we constructed habitat models explaining the spatial patterns of large and small Arctic and Pacific copepods separately. Copepods were sampled using NORPAC (North Pacific Standard) nets. The structures of water masses indexed by principle component analysis scores, satellite-derived timing of sea ice retreat, bottom depth and chlorophyll a concentration were integrated into generalized additive models as explanatory variables. The adequate models for all copepods exhibited clear continuous relationships between the abundance of copepods and the indexed water masses. Large Arctic copepods were abundant at stations where the bottom layer was saline; however they were scarce at stations where warm fresh water formed the upper layer. Small Arctic copepods were abundant at stations where the upper layer was warm and saline and the bottom layer was cold and highly saline. In contrast, Pacific copepods were abundant at stations where the Pacific-origin water mass was predominant (i.e. a warm, saline upper layer and saline and a highly saline bottom layer). All copepod groups showed a positive relationship with early sea ice retreat. Early sea ice retreat has been reported to initiate spring blooms in open water, allowing copepods to utilize more food while maintaining their high activity in warm water without sea ice and cold water. This finding indicates that early sea ice retreat has positive effects on the abundance of all copepod groups in the northern Bering and Chukchi seas, suggesting a change from a pelagic–benthic-type ecosystem to a pelagic–pelagic type.
日付	Issued2016-08-12
言語	eng
資源タイプ	journal article
出版タイプ	VoR
資源識別子	HDL http://hdl.handle.net/2115/65454
関連	isIdenticalTo DOI https://doi.org/10.5194/bg-13-4555-2016
収録誌情報	EISSN 1726-4189 en Biogeosciences 巻13 号15 開始ページ4555 終了ページ4567
ファイル	fulltext Yamaguchi Biogeo 4555.pdf 3.04 MB (application/pdf) Issued2016-08-12
コンテンツ更新日時	2023-07-26