Environmental factors affecting distribution of the alien Formosan squirrel in fragmented landscape

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  • 外来種の現状把握と対策　　市街地における移入種タイワンリスの生息分布と林分環境
  • シガイチ ニ オケル イニュウシュ タイワンリス ノ セイソク ブンプ ト リンブン カンキョウ

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A hundred of woods, ranging in size from 0.17 to 39.17 ha, were surveyed in Ohuna, Kanagawa Prefecture, and presence/absence data of the invasive Formosan squirrel were collected from December 2001 to December 2002. The Formosan squirrel was ascertained in 42 woods of them. We measured 11 environmental variables of each wood, those are, wood area, distance to the nearest neighbor wood, distance to <5ha wood with squir-rels, percentage of broad-leaved evergreen trees, conifer trees, deciduous trees, or others, and percentage surrounded by cultivated field, residential quarter, road, or others. The most important variable for the occupancy of squirrel was the woods area. The percentage of broad-leaved evergreen trees in woods and the percentage of cultivated field in surrounding area had also positive effects on the presence of squirrel. By adding latter two variables to the woods area, the logistic regression model was improved to account for the probability of the Formosan squirrel in isolated woods (Cox & Snell R2=0.45, P<0.001). Current expansion of this species in Kanagawa Prefecture was explained by these environmental variables; large woods with broad-leaved evergreen trees have been reserved in Kamakura and Zushi City, a center of distribution of the Formosan squirrel. Further studies using the present model will be necessary to know how the Formosan squirrel expands in future through urban environments.

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