Wojczulanis-Jakubas Katarzyna, Jakubas Dariusz, Foucher Julien, Dziarska-Pałac Joanna, Dugué Hubert
Department of Vertebrate Ecology and Zoology, University of Gdańsk, ul. Wita Stwosza 59, 80-308, Gdańsk, Poland,
Naturwissenschaften. 2013 Nov;100(11):1095-8. doi: 10.1007/s00114-013-1108-4. Epub 2013 Oct 24.
Relatively little attention has been paid to sex differences in the migration of birds in autumn. We studied the autumn migration strategy of molecularly sexed males and females in the globally threatened aquatic warbler Acrocephalus paludicola. We captured 176 birds at a stopover site in the Loire estuary at Donges, France. The median date for the passage of adults was 8 days earlier in males than females, although the timing of migration in first-year males and females was similar. This indicates that males, who are without parental duties, can start their migration earlier than females and first-year birds. Adults were significantly heavier than immature birds but did not have higher fat scores. In both age categories, more males (two to three times more) were captured. However, various factors (including tape-luring) can affect observed sex ratio.
相对而言，秋季鸟类迁徙中的性别差异很少受到关注。我们研究了全球受威胁的水蒲苇莺（Acrocephalus paludicola）中经分子鉴定性别的雄性和雌性的秋季迁徙策略。我们在法国东热斯卢瓦尔河口的一个中途停歇地捕获了176只鸟。成年雄性的迁徙中位日期比雌性早8天，不过一岁雄性和雌性的迁徙时间相似。这表明没有育雏职责的雄性比雌性和一岁鸟能更早开始迁徙。成年鸟明显比幼鸟重，但脂肪得分并不更高。在两个年龄组中，捕获的雄性都更多（多两到三倍）。然而，各种因素（包括磁带诱捕）会影响观察到的性别比例。
