タヌキ, テン, アナグマ, イタチおよびキツネの捕獲数の変動

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書誌事項

タイトル別名
  • Analysis on the Hunted Numbers of the Raccoondogs (<I>Nyctereutes</I>), the Martens (<I>Martes</I>), the Badgers (<I>Meles</I>), the Weasels (<I>Mustela</I>) and the Foxes (<I>Vulpes</I>) in Japan
  • タヌキ テン アナグマ イタチ オヨビ キツネ ノ ホカクスウ ノ ヘンドウ

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説明

This paper deals with the changes of the medium sized mammals, succeeding the previous report in which the author considered the problems of the large games. Through the official recrods of hunting harvests from 1951 to 1975, the hunted numbers of the raccoondogs maintain about four million heads. Prefectural average of the hunted numbers and the standard deviation (H-SD relation) shows a linear relation on logarithmic graph, as same as in the large games. But, anual change of each prefecture is not uniformal. The numbers of the martens increase gradually from 1950 to 1955, and thereafter sustain about eight thousand heads. The anual deviation is larger than that of the raccoondogs. H-SD relation is rather non-linear. The trends in each prefecture are various, and no stationary harvest is seen in any prefecture. The badgers decrease in the hunted numbers, and the weasels (male) also do more rapidly. Those trends are similarly shown in all prefectures. The changes of the foxes of Japan in total, as well as of almost prefectures, can be deviled into two periods. From 1950 to 1960, they show rather decreasing, and thereafter they increase gradually. H-SD relations of both periods are comparatively straight on logarithmic graphs. As to the correlations among anual hunted numbers of each species, those of raccoondogs, badgers and weasels relate closely to the changes of the numbers of trappers, but, those of martens and foxes are independent. With regard to the average hunted numbers in each prefecture, all species correlate to each other and to the numbers of trappers.

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