表日光におけるニホンジカのエアカウントの精度
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概要
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An aerial count of sika (<I>Cervus nippon</I>) was taken by using a helicopter "Alouette III" in the area of about 2, 000 ha, Omote-Nikko, Tochigi Prefecture, December 15, 1978, and was examined in accuracy by the result of the ground count. The subalpine selection forests of <I>Tsuga diversifolia</I> and <I>Betula ermanii</I>, and unclosed stands of these trees dominated in the area above 1, 600m altitude. The area below it was covered with unclosed artificial stands of coniferous trees and deciduous forests of <I>Quercus mongolica, Fagus crenata</I>, and <I>Larix leptolepis</I>. The helicopter flew 25 minutes from 9: 40a.m. to 10: 05a.m, at 70-120km per hour and 50-200m above the ground, zigzaging in a strip of 500m width over the area. Thirty-nine deer, 7 female groups and two singles, were counted from the air; 25 of them were seen in the ground count area of 590 ha. On the other hand, 174 deer were counted by a block count method, one of the ground counts, with 11 blocks and average block size of 53ha and taking three hours from 6: 30a.m. to 9: 30a.m. Comparing with its result, the accuracy of the aerial count was estimated at 14.4 percent for the whole area. In the area above 1, 600m altitude, only one deer was seen. In the area below it, however, higher accuracy of 30 percent was obtained.
- 日本哺乳類学会の論文