期刊
PLANT SPECIES BIOLOGY
卷 36, 期 2, 页码 361-367出版社
WILEY
DOI: 10.1111/1442-1984.12314
关键词
alien herbivorous mammal; conservation strategy; endangered plant; exclosure; oceanic island
资金
- Global Environment Research Fund [F-51]
Oceanic islands are at high risk of invasive species, impacting biodiversity conservation. Protecting endangered species and addressing threats is crucial. In the case of Crepidiastrum grandicollum, population decline is mainly caused by browsing goats, highlighting the need for eradication and restoration efforts.
Oceanic islands are biodiversity hotspots with highly endemic ecosystems that are vulnerable to invasive alien species. Understanding the status of endangered species and identifying threats have the highest priority for insular biodiversity conservation. The two remaining populations of endangered Crepidiastrum grandicollum on Chichi-jima Island were studied for 5 years to describe their status and evaluate the impacts of feral goats (Capra hircus). The main cause of population decline was browsing by goats. The populations protected by the exclosures were stable but declined after an exclosure was removed. Even in the protected population, regeneration was limited outside the exclosures and in 1 year of the survey, a high proportion of feeding damage by moth larvae was observed in one population. These facts indicate that exclosures are not a sufficient conservation measure, and eradication of goats and population restoration in novel habitats are necessary to reduce the extinction risk of C. grandicollum.
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