Journal of Forest Research

, Volume 10, Issue 6, pp 429–433

Chemical components of hardwood barks stripped by the alien squirrel Callosciurus erythraeus in Japan


DOI: 10.1007/s10310-005-0162-y

Cite this article as:
Tamura, N. & Ohara, S. J For Res (2005) 10: 429. doi:10.1007/s10310-005-0162-y


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.

Key words

Bark strippingCallosciurus erythraeusSquirrelSugarsDefensive compounds

Copyright information

© The Japanese Forest Society and Springer-Verlag Tokyo 2005

Authors and Affiliations

  1. 1.Tama Forest Science GardenTokyoJapan
  2. 2.Department of Forest ChemistryForestry and Forest Products Research InstituteTsukubaJapan