Chemical components of hardwood barks stripped by the alien squirrel Callosciurus erythraeus in Japan |
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Authors: | Noriko Tamura Seiji Ohara |
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Institution: | (1) Tama Forest Science Garden, 1833 Todori, Hachioji, Tokyo 193-0843, Japan;(2) Department of Forest Chemistry, Forestry and Forest Products Research Institute, Tsukuba, Japan |
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Abstract: | The Pallas squirrel (Callosciurus erythraeus; common name in Japan: Formosan squirrel) was introduced in the 1950s and has established populations throughout southeastern
Kanagawa Prefecture, Japan. Some tree species in natural forests, parks, and gardens in residential areas have been intensively
debarked by the squirrels, especially in winter and spring. The amounts of chemical components, such as polyphenols, resins,
flavanols, and sugars, in the bark were compared among species and individual trees collected in the forest of Yokohama Nature
Sanctuary. Interspecific differences in the extent of stripping were not related to the amounts of the four chemical components.
For individual trees, the bark with feeding scars tended to contain more sugar than that without scars. |
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Keywords: | Bark stripping Callosciurus erythraeus Squirrel Sugars Defensive compounds |
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