ABSTRACT

Bark stripping damages of conifer trees by Asiatic black bears (Ursus thibetanus) are confirmed in most areas inhibited by them in Japan. In this study, we conducted a field survey in Shirakawa Village, Gifu Prefecture, Japan, from 2008 to 2016 to investigate the seasonal and annual variation of bark-stripping of Japanese cedar (Cryptomeria japonica) by Asiatic black bears in relation to mast production of Fagaceae family and diet. We found that bark stripping occurred from May to July, during which sap flow in the cambium layers is high. Bark stripping frequency on Japanese cedar was negatively associated with mast production of Fagaceae hard mast. Fleshly fruit of Japanese bird cherry does not appear to affect bark stripping in contrast to other areas. Our results suggested that foods that affect frequency of bark stripping may differ among regions.

摘要

在日本，大多数受黑熊抑制的地区都证实了亚洲黑熊（Ursus thibetanus）对针叶树树皮的破坏。在这项研究中，我们于2008年至2016年在日本岐阜县白川村进行了野外调查，以调查雪松剥皮的季节和年度变化（柳杉）），由亚洲黑熊（Akatic black bears）进行的有关菊科（Fagaceae）家族肥大和饮食的研究。我们发现树皮剥离发生在5月至7月，在此期间形成层中的汁液流量很高。日本柳杉的树皮剥皮频率与菊科硬桅杆的桅杆生产负相关。与其他地区相比，日本鸟樱桃的果肉似乎不影响树皮剥离。我们的结果表明，影响树皮剥皮频率的食物在各个地区可能有所不同。