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北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University >
第69巻 第2号 >

Ingestion rates and grazing impacts of Arctic and Pacific copepods in the western Arctic Ocean during autumn

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Please use this identifier to cite or link to this item:http://doi.org/10.14943/bull.fish.69.2.93

Title: Ingestion rates and grazing impacts of Arctic and Pacific copepods in the western Arctic Ocean during autumn
Authors: Matsuno, Kohei Browse this author →KAKEN DB
Fujiwara, Amane Browse this author →KAKEN DB
Hirawake, Toru Browse this author →KAKEN DB
Yamaguchi, Atsushi Browse this author →KAKEN DB
Keywords: ingestion rate
grazing impact
Pacific copepods
Arctic Ocean
Issue Date: 9-Dec-2019
Publisher: 北海道大学大学院水産科学研究院
Journal Title: 北海道大学水産科学研究彙報
Journal Title(alt): Bulletin of Fisheries Sciences, Hokkaido University
Volume: 69
Issue: 2
Start Page: 93
End Page: 102
Abstract: Increasing numbers of Pacific copepods are being transported from the Bering Sea to the Arctic Ocean, so there is clear potential to affect the structure and composition of the Arctic food web. We investigated the grazing impacts of Arctic and Pacific copepods in the western Arctic Ocean using shipboard experiments during autumn. Ingestion rates for both Arctic and Pacific species were low and linked to low food availability. The ingestion rates varied with species, but were not related to chlorophyll a. The maximum ingestion rates calculated by the Michaelis-Menten equation were higher in the Arctic species (3.6% body carbon day−1) than in the Pacific species (0.10% body carbon day−1). The community grazing impacts were 0-0.57% remove day−1, and the Pacific copepods contributed 0.1-17% for this parameter. Even if Pacific copepods are transported into the Arctic Ocean and ingest the natural protist assemblage, their impact is spatially and seasonally limited, and, at present, Pacific copepods are unlikely to cause a shift in the protist biomass of the western Arctic Ocean during autumn.
Type: bulletin (article)
URI: http://hdl.handle.net/2115/76384
Appears in Collections:北海道大学水産科学研究彙報 = Bulletin of Fisheries Sciences, Hokkaido University > 第69巻 第2号

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