ニホンカモシカの個体数推定法としての区画法

概要

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The block count method was applied to serow (Capricornis crispus) populations, and its efficiency was examined in Wakinosawa Village, Aomori Prefecture, and Agatsuma-gun, Gunma Prefecture, in 1976 and 1977. Each count area covered about 200 ha and was divided about equally into the count units, which varied in size from about 5 to 50 ha at each count series. The number of serows counted increased as the unit size decreased. This relation was described as the n-s curve, a reversed S-shaped curve, with the upper asymptote in favorable visibility conditions such as unclosed coniferous stands and deciduous forests after defoliation. In low visbility conditions such as young-aged coniferous forests, densely grown sasa (dwarf bamboo) communities and summer full leaves, the n-s curve showed an incomplete shape, a reversed J-shaped curve. Using the n-s curve, it was concluded that the highest accuracy was obtained in the 5-ha unit and in 1.5-hour counts under conditions of usual visibility and also could be obtained in the 10-ha unit in two-hour counts under conditions of favorable visibility.
1983-09-30