Threats to the population of the Ogasawara Greenfinch in the Ogasawara Islands

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  • オガサワラカワラヒワの個体群存続に対する脅威

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Abstract

The distribution of the Ogasawara Greenfinch, which inhabits the Ogasawara Islands, has greatly reduced since human settlement. Recently, the population has further declined. Various factors associated with human activities are thought to have caused this dramatic decline. Particularly, predation on nests by invasive alien black and Norway rats, predation by cats in foraging areas, and habitat destruction by goats are thought to have significantly impacted the survival of the population. Food shortages due to typhoons and droughts could have affected reproductive success. Furthermore, the expansion of the distribution of invasive alien plants and their management, chemical substances such as rodenticides, and infectious diseases might have threatened the survival of this bird. The removal of these factors is essential for restoring the population and the distribution of the Ogasawara Greenfinch.

Journal

  • Ogasawara research

    Ogasawara research 48 17-30, 2022-03

    東京都立大学小笠原研究委員会

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