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Diets and body condition of polar cod (Boreogadus saida) in the northern Bering Sea and Chukchi Sea

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Title: Diets and body condition of polar cod (Boreogadus saida) in the northern Bering Sea and Chukchi Sea
Authors: Nakano, Tsubasa Browse this author
Matsuno, Kohei Browse this author →KAKEN DB
Nishizawa, Bungo Browse this author
Iwahara, Yuka Browse this author
Mitani, Yoko Browse this author →KAKEN DB
Yamamoto, Jun Browse this author →KAKEN DB
Sakurai, Yasunori Browse this author →KAKEN DB
Watanuki, Yutaka Browse this author →KAKEN DB
Keywords: Gelatinous zooplankton
Lipid content
Prey availability
Regional differences
Stomach fullness
Issue Date: Jun-2016
Publisher: Springer
Journal Title: Polar biology
Volume: 39
Issue: 6
Start Page: 1081
End Page: 1086
Publisher DOI: 10.1007/s00300-015-1769-x
Abstract: To understand trophic responses of polar cod Boreogadus saida (a key species in Arctic food webs) to changes in zooplankton and benthic invertebrate communities (prey), we compared its stomach contents and body condition between three regions with different environments: the northern Bering Sea (NB), southern Chukchi Sea (SC), and central Chukchi Sea (CC). Polar cod were sampled using a bottom trawl, and their potential prey species in the environment were sampled using a plankton net and a surface sediment sampler. Polar cod fed mainly on appendicularians in the NB and SC where copepods were the most abundant in the environment, while they fed on copepods, euphausiids, and gammarids in the CC where barnacle larvae were the most abundant species in plankton samples on average. The stomach fullness index of polar cod was higher in the NB and SC than CC, while their body condition index did not differ between these regions. The lower lipid content of appendicularians compared to other prey species is the most plausible explanation for this inconsistency.
Rights: The final publication is available at link.springer.com
Type: article (author version)
URI: http://hdl.handle.net/2115/65797
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: 綿貫 豊

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