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Major decline in marine and terrestrial animal consumption by brown bears (Ursus arctos)

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Title: Major decline in marine and terrestrial animal consumption by brown bears (Ursus arctos)
Authors: Matsubayashi, Jun Browse this author
Morimoto, Junko O. Browse this author
Tayasu, Ichiro Browse this author
Mano, Tsutomu Browse this author
Nakajima, Miyuki Browse this author
Takahashi, Osamu Browse this author
Kobayashi, Kyoko Browse this author
Nakamura, Futoshi Browse this author →KAKEN DB
Issue Date: 18-Mar-2015
Publisher: Nature Publishing Group
Journal Title: Scientific reports
Volume: 5
Start Page: 9203
Publisher DOI: 10.1038/srep09203
Abstract: Human activities have had the strongest impacts on natural ecosystems since the last glacial period, including the alteration of interspecific relationships such as food webs. In this paper, we present a historical record of major alterations of trophic structure by revealing millennium-scale dietary shifts of brown bears (Ursus arctos) on the Hokkaido islands, Japan, using carbon, nitrogen, and sulfur stable isotope analysis. Dietary analysis of brown bears revealed that salmon consumption by bears in the eastern region of Hokkaido significantly decreased from 19% to 8%. In addition, consumption of terrestrial animals decreased from 56% to 5% in western region, and 64% to 8% in eastern region. These dietary shifts are likely to have occurred in the last approximately 100-200 years, which coincides with the beginning of modernisation in this region. Our results suggest that human activities have caused an alteration in the trophic structure of brown bears in the Hokkaido islands. This alteration includes a major decline in the marine-terrestrial linkage in eastern region, and a loss of indirect-interactions between bears and wolves, because the interactions potentially enhanced deer predation by brown bears.
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 中村 太士

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