Breeding density and habitat selection of Large-billed Crows <i>Corvus macrorhynchos</i> in montane forest areas of Japan

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  • 山地の森林におけるハシブトガラスの生息密度と環境選好
  • サンチ ノ シンリン ニ オケル ハシブトガラス ノ セイソク ミツド ト カンキョウセン コウ

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Abstract

The natural habitat of the Large-billed Crow Corvus macrorhynchos in Japan is considered to be forest. We investigated the occurrence of this species in montane areas of Japan to elucidate its habitat selection. In montane areas, crow numbers tended to be lower than in urban area such as in Tokyo. Crows were likely to occur in higher numbers in areas where human activity was greater; however, occurrence was not correlated with altitude. Notably, crow density was higher in evergreen broad leaved and coniferous forests than in deciduous forests. Nesting in evergreen forests is suspected to be adaptive because the crows may avoid nest predation there because of the reduced visibility.

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