著者

三上 修 森本 元

出版者

公益財団法人 山階鳥類研究所

雑誌

山階鳥類学雑誌 (ISSN:13485032)

巻号頁・発行日

vol.43, no.1, pp.23-31, 2011-09-30 (Released:2013-09-30)

参考文献数

18

被引用文献数

1 2

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A previous study has demonstrated that the population size of the Tree sparrow Passer montanus in Japan is declining. To confirm this, we examined reports on the number of tree sparrows banded in Japan from 1987 to 2008. If the population size of the tree sparrow is actually diminishing, then the numbers banded should also reflect this. Results showed that the number of tree sparrows banded over this period decreased by more than half, and support previous studies documenting the decline of the tree sparrow in Japan.