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Influences of mesoscale anticyclonic eddies on the zooplankton community south of the western Aleutian Islands during the summer of 2010

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Title: Influences of mesoscale anticyclonic eddies on the zooplankton community south of the western Aleutian Islands during the summer of 2010
Authors: Saito, Rui Browse this author
Yamaguchi, Atsushi Browse this author →KAKEN DB
Yasuda, Ichiro Browse this author →KAKEN DB
Ueno, Hiromichi Browse this author →KAKEN DB
Ishiyama, Hiromu Browse this author
Onishi, Hiroji Browse this author →KAKEN DB
Imai, Ichiro Browse this author →KAKEN DB
Keywords: Aleutian eddies
Calanoid copepods
Mesoscale anticyclonic eddies
Issue Date: Jan-2014
Publisher: Oxford University Press
Journal Title: Journal of plankton research
Volume: 36
Issue: 1
Start Page: 117
End Page: 128
Publisher DOI: 10.1093/plankt/fbt087
Abstract: Mesoscale anticyclonic eddies have been observed south of the Aleutian Islands. Eddies farther east, in the Gulf of Alaska, are known to transport coastal water and coastal zooplankton to the offshore open ocean. The impacts of mesoscale anticyclonic eddies formed south of the western Aleutian Islands (Aleutian eddies) on the zooplankton community are not fully understood. In the present study, we describe zooplankton population structures within an Aleutian eddy and outside the eddy during July 2010. Based on the sea-level anomaly, the Aleutian eddy was formed south of Attu Island (172 degrees 54'E) in February 2010, and it moved southeastward in the next 5 months. Large oceanic copepods, Neocalanus cristatus, Eucalanus bungii and Metridia pacifica were more abundant inside the eddy than the outside. Inside the eddy, the life stage distribution of N. cristatus was more advanced than that outside, and Neocalanus spp. had accumulated more lipids. These conditions probably reflect the greater primary production in the eddy, production enhanced by nutrients advected into the eddy. The Aleutian eddy contained mostly oceanic copepods because it was formed in the offshore water and/or eddy-eddy interaction occurred after its formation. The sufficient food condition in the eddy presumably resulted in higher growth and survival rates of these oceanic copepods, resulting in the greater abundance, advanced development stages and greater lipid accumulation.
Rights: This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Journal of Plankton Research following peer review. The definitive publisher-authenticated version J. Plankton Res. (January/February 2014) 36 (1): 117-128. is available online at:
Type: article (author version)
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: 今井 一郎

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