Wojczulanis-Jakubas Katarzyna, Chrostek Małgorzata E, Jiguet Frédéric, Martínez Carlos Zumalacárregui, Miguélez David, Neto Júlio M
Department of Vertebrate Ecology and Zoology, University of Gdańsk, ul. Wita Stwosza 59, 80-308, Gdańsk, Poland.
Centre d'Ecologie et des Sciences de la Conservation, UMR 7204 MNHN-CNRS-UPMC-Sorbonne Universités, CP 135, 55 Rue Buffon, 75005, Paris, France.
Naturwissenschaften. 2017 Nov 14;104(11-12):101. doi: 10.1007/s00114-017-1525-x.
Differential migration has been extensively reported in spring, but less so in autumn, particularly in relation to sex in monomorphic bird species. Here, we analysed the autumn passage of a monomorphic, globally threatened passerine, the Aquatic Warbler Acrocephalus paludicola throughout Western Europe, with regard to age and sex. We showed that, overall, adults migrated earlier than first-year birds, and males migrated earlier than females during the autumn migration. This may be caused by an overall social dominance of adults over immatures, and differentiated migration strategy of males and females. In addition, we found male-skewed sex proportions, with a tendency to an equalised ratio in more southern stopover sites. This may indicate a male bias in the global population or different migration strategies of the sexes. Differential migration may cause the age and sex classes to be exposed differently to various threats affecting demographic structure of the species.
春季的差异迁徙已有大量报道，但秋季的报道较少，尤其是在单态性鸟类物种中与性别相关的差异迁徙。在此，我们分析了一种单态性、全球受威胁的雀形目鸟类——水蒲苇莺Acrocephalus paludicola在整个西欧秋季迁徙过程中的年龄和性别情况。我们发现，总体而言，成年鸟在秋季迁徙中比当年幼鸟更早出发，且雄性比雌性更早出发。这可能是由于成年鸟在总体上对未成年鸟具有社会优势，以及雄性和雌性不同的迁徙策略所致。此外，我们发现性别比例偏向雄性，在更靠南的中途停歇地有趋于平衡的趋势。这可能表明全球种群中存在雄性偏差或两性不同的迁徙策略。差异迁徙可能导致不同年龄和性别的群体在面对影响该物种种群结构的各种威胁时受到不同程度的影响。
