生息環境の相違によるキタキツネVulpes vulpes schrencki KISHIDAの食性の変化について
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概要
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Recently, the red fox (<I>Vulpes vulpes schrencki</I> KISHIDA) has increased in number not only in fishing and agrarian villages, but also in the suburbs of cities. It was assumed that the phenomenon was attributed at least in part to a large quantity of artificial foods which had been produced by human activities. Then, the author carried out a comparative study on the food habits of the red fox by analysing droppings which had been collected from three different habitats in the central Hokkaido, <I>i.e</I>., the most natural Tomakomai, intermediate Hitsujigaoka, and suburban Bankei, during 15 months from January 1975 to March 1976.<BR>1) In all study areas, the red-backed vole (<I>Clethrionomys rufocanus</I>) was the main food of the fox.<BR>2) In Tomakomai and Hitsujigaoka, ingestion rate of the red-backed vole by fox increased in spring and autumn, and decreased in winter. The ingestion rate of insects and wild fruits increased in summer and autumn.<BR>3) In winter, hare (<I>Lepus timidus</I>) supplemented the decrease of the ingestion rate of the red-backed vole in Tomakomai. In Hitsujigaoka, poultry and corn did the same role as hare in the former.<BR>4) In Bankei, the ingestion rate of vole did not decrease in winter, and the fox largely depended on artificial foods through the year.<BR>5) In all study areas, the ingestion rate of birds increased in winter.<BR>6) The more the habitat has been modified by human activities, the more the fox has depended on artificial foods.
- 日本哺乳類学会の論文