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Eradication of the mongoose is crucial for the conservation of three endemic bird species in Yambaru, Okinawa Island, Japan
Biological Invasions ( IF 2.9 ) Pub Date : 2021-04-12 , DOI: 10.1007/s10530-021-02503-w
Tsutomu Yagihashi , Shin-Ichi Seki , Tomoki Nakaya , Katsushi Nakata , Nobuhiko Kotaka

Okinawa Island, Japan, is a globally important biodiversity hotspot. Three endemic bird species, Okinawa rail (Hypotaenidia okinawae), Okinawa woodpecker (Dendrocopos noguchii), and Okinawa robin (Larvivora namiyei), are found only in the Yambaru region of the northern part of Okinawa Island. In order to conserve endemic species, it is important to determine the effect of alien species on endemic species. We conducted playback surveys four times every three years from 2007 to 2016 to evaluate the recent distribution of these three forest-dwelling bird species during the breeding season. Then, the association between the numbers of detections of these three species with the invasive mongoose density and the hardwood forest area was evaluated with a generalized additive mixed model (GAMM). The results showed that the distribution areas of these bird species have been recovering since the 2007 within the small Indian mongoose (Urva auropunctata) controlled area. The GAMM results showed that these bird species were abundant in areas with fewer small Indian mongooses and larger areas of hardwood forests. Thus, the mongoose had a negative impact not only on the flightless rails but also on the woodpeckers and the robins. In recent years, most of the old-growth forests have been designated as protected forests, and large-scale logging is no longer taking place in Yambaru. Eradication of the mongoose is particularly important for the conservation of these three endemic bird species.



中文翻译:

根除猫鼬对日本冲绳岛延巴鲁市的三种特有鸟类的保护至关重要

日本冲绳岛是全球重要的生物多样性热点。三种特有鸟类:冲绳铁路(Hypotaenidia okinawae),冲绳啄木鸟(Dendrocopos noguchii)和冲绳知更鸟(Larvivora namiyei))仅在冲绳岛北部的Yambaru地区发现。为了保护特有物种,重要的是确定外来物种对特有物种的影响。从2007年到2016年,我们每三年进行四次回放调查,以评估这三个森林栖居鸟类在繁殖季节的最新分布。然后,使用广义加性混合模型(GAMM)评估了这3个物种的检出次数与入侵猫鼬密度和硬木森林面积之间的关联。结果表明,自2007年以来,这些鸟类的分布区域已在小印度猫鼬(Urva auropunctata)中恢复。)控制区域。GAMM结果表明,这些鸟类种类丰富,而印度小猫鼬数量较少,而阔叶林面积较大。因此,猫鼬不仅对无法飞行的铁轨有负面影响,而且对啄木鸟和知更鸟也有负面影响。近年来,大多数旧林被指定为保护林,扬巴鲁不再进行大规模采伐。消除猫鼬对这三种特有鸟类的保护尤为重要。

更新日期:2021-04-12
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