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Drastic decline in the endemic brown shrike subspecies Lanius cristatus superciliosus in Japan
Bird Conservation International ( IF 1.6 ) Pub Date : 2020-11-17 , DOI: 10.1017/s0959270920000556
MUNEHIRO KITAZAWA , MASAYUKI SENZAKI , HIROAKI MATSUMIYA , SEIICHI HARA , HARUKA MIZUMURA

The Brown Shrike Lanius cristatus breeds across a large portion of eastern Asia. One subspecies, L. c. superciliosus, is primarily endemic to Japan and was historically abundant throughout its breeding range. However, both local- and broad-scale studies documented a drastic population decline between the 1970s and 1990s, and the status of the taxon is currently unavailable in Japan. We conducted a nationwide survey to estimate the current population size and breeding range of this subspecies within Japan. We further compared our findings to the historical breeding ranges through a literature review. The total population size was estimated at 149 breeding pairs, and the current breeding range was estimated at 6,800 km2, indicating a 90.9% range contraction over the past century. Our study highlights the urgency of protecting remaining breeding habitats and establishing effective conservation strategies for L. c. superciliosus.



中文翻译:

日本特有的棕伯劳亚种 Lanius cristatus superciliosus 急剧下降

布朗伯劳Lanius cristatus在东亚大部分地区繁殖。一个亚种,L. c. superciliosus主要是日本特有的,历史上在其整个繁殖范围内都很丰富。然而,本地和大范围的研究都记录了 1970 年代和 1990 年代之间的人口急剧下降,并且该分类群的状态目前在日本是不可用的。我们进行了一项全国性调查,以估计该亚种在日本目前的种群规模和繁殖范围。我们通过文献回顾进一步将我们的发现与历史育种范围进行了比较。总种群规模估计为 149 对,目前的繁殖范围估计为 6,800 km 2,表明过去一个世纪的幅度收缩了 90.9%。我们的研究强调了保护剩余繁殖栖息地和为L. c.建立有效保护策略的紧迫性。眉眼

更新日期:2020-11-17
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