The endangered Brown Shrike subspecies <i>Lanius cristatus superciliosus</i> has a male-biased sex ratio and only early arriving males are paired

The endangered Brown Shrike subspecies <i>Lanius cristatus superciliosus</i> has a male-biased sex ratio and only early arriving males are paired
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濒临灭绝的棕伯劳亚种 <i>Lanius cristatus superciliosus</i> 的性别比例偏向雄性,只有早到的雄性才会配对

DOI:
10.1017/s0959270921000216
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发表时间:
2021
影响因子:
1.6
通讯作者:
HIGUCHI HIROYOSHI
HIGUCHI HIROYOSHI
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
MIZUMURA HARUKA;KUBOTA KOHEI;HIGUCHI HIROYOSHI

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沿着许多长距离迁徙雀形目鸟类在东亚-澳大拉西亚飞行路线,迁徙的布朗伯劳Lanius cristatus superciliosus已急剧下降,在其整个繁殖范围。在20世纪10年代至21世纪10年代期间,日本的繁殖范围缩小了90.9%。相比之下,与之关系密切但居住在这里的牛头伯劳L。bucephalus bucephalus已逐渐减少,但在日本仍是一种常见的留鸟。为了更好地了解褐伯劳的急剧下降,我们比较了这两个物种在连续三个繁殖季节的配对成功率。约60-70%的棕色伯劳雄性是未配对的,这远远高于未配对的雄性牛头伯劳的百分比(c.0-20%)。棕色伯劳男性到达后没有配对,因为人口的性别比例是严重偏向男性。褐伯劳种群偏向雄性的因素之一可能是在越冬地或迁徙途中的死亡率偏向雌性,需要进行跟踪研究来检验这一点。
Along with many long-distance migrant passerine species in the East Asian-Australasian Flyway, the migratory Brown Shrike Lanius cristatus superciliosus has been sharply declining throughout its breeding range. Its breeding range in Japan shrank by 90.9% between the 1910s and 2010s. In contrast, the closely related but resident Bull-headed Shrike L. bucephalus bucephalus has been gradually declining but is still a common resident in Japan. To better understand the drastic decline of Brown Shrike, we compared the pairing success during three consecutive breeding seasons of these two species. About 60–70% of Brown Shrike males were unpaired, which was much higher than the percentage of unpaired male Bull-headed Shrike (c.0–20%). Brown Shrike males arriving later did not pair because the population’s sex proportion is heavily biased toward males. One of the factors of male-biased population of Brown Shrike may be female-biased mortality in wintering sites, or on the migratory journey, and tracking studies will be required to test this.
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