ニホンジカ個体数調査法としての区画法の札掛における試用

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タイトル別名
  • Preliminary Examination of Block Count Method for Estimating Numbers of Sika Deer in Fudakake
  • ニホンジカ コタイスウ チョウサホウ トシテノ ク カクホウ ノ フダ カケ ニ

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By using the n-s curve, which represents relationship between counted animal numbers and count unit size, the accuracy of block count method, considered to be a practical method for counting numbers of sika deer (Cervus nippon), was tentatively applied in Fudakake, Tanzawa mountains, Kanagawa Prefecture, 1972-1975. The size of count-units ranged from 6.5 to 40.4 ha. It took three hours in more than 10 ha-unit counts and one hour in 6.5 ha-unit count. The whole count area was 98 ha in the 6.5 ha-unit count and 260 or 320 ha in other unit-counts. The highest value of 31/km2 was obtained in the smallest unit of 6.5 ha. The larger the count units, the lower the accuracy; the n-s curve obtained resembled a reversed J-shaped curve. This pattern may be caused mainly by a high percentage of forest-covered area and densely grown Miscanthus grass widespread in cut-over areas and young-aged plantations. Since a 6.5 ha-unit was probably small enough for search of sika deer, a nearly actual number should be obtained in this small unit in one hour-count.

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