Habitat Evaluation of Red Pine Forest as a Habitat of Japanese Squirrels, Sciurus lis.

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  • Tamura N.
    Tama Forest Science Garden, Forestry and Forest Products Research Institute
  • Aikyo C.
    Department of Ecoregion Science, Faculty of Agriculture, Tokyo University of Agriculture and Technology
  • Kataoka T.
    Tama Forest Science Garden, Forestry and Forest Products Research Institute

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  • ニホンリスの生息場所としてのアカマツ林の環境評価
  • ニホンリス ノ セイソク バショ ト シテノ アカマツリン ノ カンキョウ ヒョウカ

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Abstract

The Japanese squirrel (Sciurus lis) is largely dependent on Japanese red pine (Pinus densiflora) for their habitat, and its local extinction are supposed to be affected by the expansion of a pine wilt disease. In this study, we examined the relationship between number of food remain and the density of squirrels in 43 ha study area of pine forest at northern Mt. Fuji from June 2003 to August 2005. The density of squirrels was estimated by trapping and radio-tracking. Food remains of pine cones on the forest floor were counted every month. The number of cones eaten by squirrels was significantly correlated with the density of squirrels. Next, based on these density criteria of the food remains, we determined a suitable structure of the pine forests for squirrels. The vegetation and the number of remained cones were compared 30 woodlots within 15 km2 area of northern Mt. Fuji. Squirrels tended to use more frequently the forest with more number of tree species and evergreen trees in the middle layer.

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