分布から見たヌ-トリアの帰化・定着,岡山県の場合
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概要
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In recent years, colonies of nutria have established in wide range in Okayama Pref.. Some damages have occurred on the rice crop by eating the shoot in this prefecrure.<BR>This report deals with histrical process of the introduction and the dispersal of nutria, based on records of annual kill and informations from legal game watchers through a questionnaire.<BR>This animals have been bred for their valuable pelts. At least 48 fur farms existed widely in Okayama Pref. from 1938 to about 1955. Because of decreasing in a demand of pelt, these farms appear to have discontinued. Then, a large number of nutrias were released. Most of them succeeded in establishing their colonies with low densities in the network of Yoshii- and Asahi-river. But they did not attract attention. The animals, settling in the reclaimed land of Kojima area, have been increasing in numbers. This area is favored condition for the animals. This population has been expanding their range gradually in two directions: to the north along Yoshii- and Asahi-river, and to the west along Oda-river.
- 日本哺乳類学会の論文