Predation impacts of four invasive frogs in Hokkaido, Japan, assessed by an index of relative importance

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  • 北海道における4種の国内外来カエルの捕食による影響 : 胃重要度指数割合からの把握
  • ホッカイドウ ニ オケル 4シュ ノ コクナイ ガイライ カエル ノ ホショク ニ ヨル エイキョウ : イ ジュウヨウド シスウ ワリアイ カラ ノ ハアク

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We assessed the effects of predation by four alien frogs in Hokkaido, Japan, by examining their diet composition based on an index with broad utility in studies of anuran food habits. Bufo japonicus formosus and Glandirana rugosa preyed on various above-ground insects, while B. japonicus formosus, Pelophylax nigromaculatus, and P. porosus preyed on frogs. Therefore, the potential impacts of invasion and competition on both native frogs and the unique ecological pyramid of Hokkaido are of concern. We found that three of the alien frogs preyed on rare species, while one preyed on other introduced species such as Bombus terrestris. The distributions of Bufo japonicus formosus, P. nigromaculatus, and P. porosus have increased, raising concerns about the impacts on their prey. P. nigromaculatus and P. porosus, which inhabit paddy fields, might also have major impacts on local wetland ecosystems.

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