Impact of Cats on Breeding Black-tailed Gulls on Tobishima Island, Yamagata, Japan

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  • Tomita Naoki
    Division of Avian Conservation, Yamashina Institute for Ornithology
  • Sato Fumio
    Division of Avian Conservation, Yamashina Institute for Ornithology
  • Iwami Yasuko
    Division of Natural History, Yamashina Institute for Ornithology

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Other Title
  • 山形県飛島のウミネコ繁殖地のネコによる被害状況
  • ヤマガタケン トビシマ ノ ウミネコ ハンショクチ ノ ネコ ニ ヨル ヒガイ ジョウキョウ

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Abstract

<p>We have monitored the status of Black-tailed Gulls Larus crassirostris breeding on Tobishima Island since 2004. On Yurijima Islet, we estimated 2,034 nests in 1 June 2014 and observed a single cat Felis catus in the breeding colony and the carcasses of 14 adult Black-tailed gulls that probably were killed by a cat. We also found feathers of adult Black-tailed Gulls in a single cat feces collected on the mainland of Tobishima. Approximately 1,500 nests were estimated on Tateiwa Islet in 2009, but no nests were found in May 2014. To conserve the breeding sites of Black-tailed Gulls at Tobishima, immediate control management of the feral cat population is essential.</p>

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