近畿大学奈良キャンパスにおける野鳥群集の季節的・年次的変動

概要

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記事区分：原著Seasonal and annual changes of wild bird communities were observed in the coppice, pond and grassland on the Nara Campus of Kinki University every year from 1995 to 2006, with the exception of 2005. The seasonal occurrence pattern varied according to breeding types; resident breeders, migrant （summer） breeders, winter visitors and passage visitors. The annual changes of most resident breeders were small; however, the number of individuals of some summer breeders and winter visitors tended to decrease. This decrease may have been caused by the changes of the environment, such as deforestation, in their countries of their origin. The ecological pyramid of numbers of birds was observed on this campus; raptors occupied the upper parts and the herbivorous birds occupied bottom parts of the pyramid. In the Nara Campus of Kinki University, the bird communities are stable, though some migrants and visitors affect the structure of bird communities.