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首页> 外文期刊>Journal of Field Ornithology >Patterns of austral bird migration in the Bolivian Chaco
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Patterns of austral bird migration in the Bolivian Chaco

机译：玻利维亚Chaco南方鸟类迁徙的模式

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摘要

Austral migrant birds were banded during austral fall (March-April) and spring (October-November) in the Chaco of Santa Cruz, Bolivia. The Tyrannidae was the most common family captured in terms of number of species and total individuals. The difference in capture numbers between the austral spring and fall seasons was the greatest for the Fuscous Flycatcher (Cnemotriccus fuscatus), although most species exhibited little change among seasons. In terms of numbers of captures across each season, no apparent trends in migratory timing were evident. The Creamy-bellied Thrush (Turdus amaurochalinus) exhibited similar fat class distributions among seasons. Within-season trends showed that in fall Creamy-bellied Thrushes with lower fat levels arrived at the study site earlier than fatter birds. Most migrant species captured were not sexually dimorphic or in breeding condition, so sexing was generally not possible. Our lack of knowledge on habitat use and migratory routes of austral migrants in the Chaco, combined with the current high rate of habitat destruction in the region, makes an understanding of the migratory patterns of these birds important.
机译：在玻利维亚圣克鲁斯的查科地区，秋季（三月至四月）和春季（十月至十一月）出现了南方移居鸟类。就物种数量和个体总数而言，霸王科是最常见的科。尽管大多数物种在季节之间变化不大，但春季南方和秋季季节捕捞数量的差异最大的是Fususus Flycatcher（Cnemotriccus fuscatus）。就每个季节的捕获数量而言，没有明显的迁徙时机趋势。奶油色鹅口疮（Turdus amaurochalinus）在各个季节之间表现出相似的脂肪类别分布。季节内的趋势表明，秋季脂肪含量较低的奶油鹅口疮画眉鸟比胖鸟更早到达研究地点。捕获的大多数移民物种不是两性或处于繁殖状态，因此通常不可能进行性别鉴定。查科地区缺乏对栖息地使用和南方迁徙者迁徙路线的了解，再加上该地区目前栖息地破坏的高发生率，因此了解这些鸟类的迁徙方式非常重要。

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