Annual variation of Cervus nippon yesoensis and the feeding damage on planted Quercus crispula in northeast Tokachi Plain

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  • 十勝平野北東部におけるエゾシカ生息数の年変動とミズナラ造林木への食害
  • トカチ ヘイヤ ホクトウブ ニ オケル エゾシカ セイソクスウ ノ ネン ヘンドウ ト ミズナラゾウリンボク エ ノ ショクガイ

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Abstract

Cervus nippon yesoensis is known to feed saplings of natural and artificial forests. However, the long term fluctuation of the population of C. nippon yesoensis and the intensity of feeding damage on the saplings is still uncertain. We have investigated the annual fluctuation of the chaches and sighting number of C. nippon yesoensis and the frequency of feeding damage of planted young Quercus crispula in Ashoro Research Forest located in the northeast Tokachi plain. The sighting number of C. nippon yesoensis immediately decreased after the onset of hunting, whereas it increased after the interruption of hunting for 7 years. The frequency of feeding damage to Quercus crispula had great variability for long time. After the the innterrption of hunting, the feeding damage immediately increased and all the saplings of Q crisplula were disappeared.

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