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Raccoon Predation on Foam Nests and Adults of the Forest Green Tree Frog (Zhangixalus arboreus: Rhacophoridae) in Central Japan
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Abstract
Abstract:
We examined predation of the forest green tree frog, Zhangixalus arboreus, as part of a two-year monitoring study of the frog's reproductive processes at four ponds in central Japan, performed by using field censuses and sensor cameras. During the period, we confirmed predation against arboreal foam nests by the common raccoon, Procyon lotor. We also found a carcass of a female adult frog with eggs and bitten ground foam nests, the signs of which were strongly suspected to indicate predation by raccoons. These results imply that invasion of Japanese forest areas by alien raccoons is becoming an increasingly serious threat to Z. arboreus through predation at various life stages of the frog. At this study site, however, the demographics of both the raccoon and Z. arboreus have not yet been examined. We need more field data to assess the long-term effects of predation pressure on the frog.
Accepted 18 5月 2021
Acknowledgments:
We thank Mr. N. Yamaguchi and Mr. N. Takabe (technical staff of the Field Science Center of Nagoya University) for their help with the fieldwork. We are grateful to all the staff of the Laboratory of Forest Protection, Nagoya University and two anonymous reviewers, for their valuable comments on our study.
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