Diets of Steller sea lions off the coast of Hokkaido, Japan: An inter-decadal and geographic comparison

Goto, Yoko; Wada, Akihiko; Hoshino, Noboru; Takashima, Takahiro; Mitsuhashi, Masaki; Hattori, Kaoru; Yamamura, Orio

Diets of Steller sea lions off the coast of Hokkaido, Japan: An inter-decadal and geographic comparison

Goto, Yoko; Wada, Akihiko; Hoshino, Noboru et al.

Marine ecology-an evolutionary perspective, 2017, 38(6), e12477

Permalink : https://hdl.handle.net/2115/68225

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アクセス権	open access
URI	https://hdl.handle.net/2115/68225
タイトル	Diets of Steller sea lions off the coast of Hokkaido, Japan: An inter-decadal and geographic comparison
著者	Goto, Yoko ; Wada, Akihiko ; Hoshino, Noboru ; Takashima, Takahiro ; Mitsuhashi, Masaki ; Hattori, Kaoru ; Yamamura, Orio
著者名 Goto, Yoko
著者名 Wada, Akihiko
著者名 Hoshino, Noboru
著者名 Takashima, Takahiro
著者名 Mitsuhashi, Masaki
著者名 Hattori, Kaoru
著者名 Yamamura, Orio
言語	英語
キーワード	diet
	diet diversity
	Eumetopias jubatus
	Hokkaido
	Steller sea lion
発行日	2017-12
出版者	John Wiley & Sons
収録物名	Marine ecology-an evolutionary perspective
巻(号)	38(6)
ページ	e12477
抄録	Inter-decadal and geographic variations in the diets of Steller sea lion, Eumetopias jubatus, were examined based on the contents of 408 stomachs collected from coastal areas around Hokkaido Island during the periods 1994-1998 and 2005-2012. The most important prey species in the 1990s were gadid fishes (walleye pollock [Gadus chalcogrammus], Pacific cod [Gadus microcephalus] and saffron cod [Eleginus gracilis]). The frequency of occurrence and gravimetric contribution of gadids decreased in the 2000s latter period at three study sites (Rausu, Shakotan and Rebun) and were replaced by Okhotsk Atka mackerel (Pleurogrammus azonus) and smooth lumpsucker (Aptocyclus ventricosus). However, analysis based on gravimetric composition indicated that the dietary diversity of prey showed only a slight inter-decadal difference, reflecting the wide diversity of prey ingested during both study periods. These results indicate that Steller sea lions along the Hokkaido coast are opportunistic feeders that utilize a wide variety of prey, and appear to feed mainly upon prey that is easily obtained.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution 4.0 International
PISSN	0173-9565
EISSN	1439-0485
NCID	AA1061899X
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1111/maec.12477