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Distribution of Arctic and Pacific copepods and their habitat in the northern Bering and Chukchi seas

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Title: Distribution of Arctic and Pacific copepods and their habitat in the northern Bering and Chukchi seas
Authors: Sasaki, Hiroko Browse this author
Matsuno, Kohei Browse this author →KAKEN DB
Fujiwara, Amane Browse this author
Onuka, Misaki Browse this author
Yamaguchi, Atsushi Browse this author →KAKEN DB
Ueno, Hiromichi Browse this author →KAKEN DB
Watanuki, Yutaka Browse this author →KAKEN DB
Kikuchi, Takashi Browse this author
Issue Date: 12-Aug-2016
Journal Title: Biogeosciences
Volume: 13
Issue: 15
Start Page: 4555
End Page: 4567
Publisher DOI: 10.5194/bg-13-4555-2016
Abstract: 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.
Rights: http://creativecommons.org/licenses/by/3.0/
http://creativecommons.org/licenses/by/3.0/
Type: article
URI: http://hdl.handle.net/2115/65454
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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