A 10 year study on the changes in animals and diel activities using an automatic camera at the Yokohama Nature Sanctuary

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  • 横浜自然観察の森での自動撮影カメラによる動物の10年間の変化と日周活動
  • ヨコハマ シゼン カンサツ ノ モリ デ ノ ジドウ サツエイ カメラ ニ ヨル ドウブツ ノ 10ネンカン ノ ヘンカ ト ニッシュウ カツドウ

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<p>A camera-trap survey with an automatic infrared sensor camera was conducted from 2008 to 2017 in Yokohama Nature Sanctuary as part of a medium and large-sized mammal survey of the “Monitoring Sites 1000 Satoyama” project. The changes in the animals and diel activities over 10 years were analyzed.</p><p> 1 There were 3 species of native animals (Racoon Dog, Japanese Hare, Japanese Weasel) and 1 genus of mice (Large Japanese Field Mouse or Small Japanese Field Mouse), 3 introduced species (Formosan Squirrel, Raccoon, Masked Civet) and 2 other species (cat, dog) that were photographed. Also 16 species of birds photographed including 2 species of introduced birds (Chinese Bamboo Partridge, Chinese Hwamei). </p><p>2 Declining trends were seen in Japanese Hare (about 30% decrease), Formosan Squirrel (about 20% decrease), Masked Civet (about 10% decrease), Racoon (about 10% before capture, about 20% after capture) . Increasing trends were seen in Racoon Dogs (about 20% increase), mice (about 15%), cats (about 15%) and Chinese Hwamei (about 70%) </p><p>3 Species with the same trend of increase/decrease as the entire country were the decline of Japanese Hare and an increase in Racoon Dog and Chinese Hwamei. Masked Civet and Raccoon showed an increase nationwide but a decrease at the Yokohama Nature Sanctuary. </p><p>4 Diel activity show that Raccoon Dogs, mice, Masked Civet and Raccoon are nocturnal with over 90% of photographs being at night. And diel activities show that Formosan Squirrel, Chinese bamboo partridge and Chinese Hwamei were photographed about 100% during the day. Japanese hare and stray/feral cats were active both day and night (the ratio of night time photography was about 50%).</p>

Journal

  • BINOS

    BINOS 26 (0), 31-40, 2019-12-01

    Wild Bird Society of Japan Kanagawa Branch

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