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The relationship between pink salmon biomass and the body condition of short-tailed shearwaters in the Bering Sea : can fish compete with seabirds?

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Title: The relationship between pink salmon biomass and the body condition of short-tailed shearwaters in the Bering Sea : can fish compete with seabirds?
Authors: Toge, Kanako Browse this author
Yamashita, Rei Browse this author
Kazama, Kentaro Browse this author
Fukuwaka, Masaaki Browse this author
Yamamura, Orio Browse this author
Watanuki, Yutaka Browse this author →KAKEN DB
Keywords: top predator
marine ecosystem
competition
body condition
prey
Issue Date: 7-Sep-2011
Publisher: The Royal Society
Journal Title: Proceedings of the Royal Society B : Biological Sciences
Volume: 278
Issue: 1718
Start Page: 2584
End Page: 2590
Publisher DOI: 10.1098/rspb.2010.2345
Abstract: Seabirds and large fishes are important top predators in marine ecosystems, but few studies have explored the potential for competition between these groups. This study investigated the relationship between an observed biennial change of pink salmon (Oncorhynchus gorbuscha) biomass in the central Bering Sea (23 times greater in odd-numbered than in even-numbered years) and the body condition and diet of the short-tailed shearwater (Puffinus tenuirostris) spending post-breeding season there. Samples were collected with research gill nets over seven summers. Both species feed on krill, small fishes and squids. Although the mean pink salmon catch per unit effort (in mass) over the study region was not related significantly with shearwater's stomach content mass or prey composition, the pink salmon biomass showed a negative and significant relationship with the shearwater's body mass and liver mass (proxies of energy reserve). We interpret these results as evidence that fishes can negatively affect mean prey intake of seabirds if they feed on a shared prey in the pelagic ecosystem.
Relation: http://rspb.royalsocietypublishing.org/
Type: article (author version)
URI: http://hdl.handle.net/2115/47073
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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