Samraoui Boudjéma, Nedjah Riad, Boucheker Abdennour, Bouzid Abdelhakim, El-Serehy Hamed A, Samraoui Farrah
Laboratoire de Conservation des Zones Humides Université 8 Mai 1945 Guelma Guelma Algeria.
Department of Biology University Badji Mokhtar Annaba Algeria.
Ecol Evol. 2023 Jan 19;13(1):e9756. doi: 10.1002/ece3.9756. eCollection 2023 Jan.
The movement of organisms is a central process in ecology and evolution, and understanding the selective forces shaping the spatial structure of populations is essential to conservation. Known as a trans-Saharan migrant capable of long-distance flights, the Glossy Ibis ' dispersal remains poorly known. We started a ringing scheme in 2008, the first of its kind in North Africa, and ringed 1121 fledglings over 10 years, of which 265 (23.6%) were resighted. Circular statistics and finite mixture models of natal dispersal indicated: (1) a strong West/Northwest-East/Southeast flight orientation; (2) Glossy Ibis colonies from North Africa and Southern Europe (particularly on the Iberian Peninsula) are closely linked through partial exchanges of juvenile and immature birds; (3) unlike birds from Eastern Europe, North African Glossy Ibis disperse to but do not seem to undergo regular round-trip migration to the Sahel; (4) young adults (>2-years-old) have a higher probability of dispersing further than individuals in their first calendar year (<1-year-old); and (5) dispersal distance is not influenced by sex or morphometric traits. Together, these results enhance our knowledge of the dispersal and metapopulation dynamics of Glossy Ibis, revealing large-scale connectivity between the Iberian Peninsula and Algeria, likely driven by the spatial heterogeneity of the landscape in these two regions and the prevailing winds in the Western Mediterranean.
生物的移动是生态学和进化中的核心过程，而了解塑造种群空间结构的选择力量对于保护工作至关重要。彩鹮作为一种能够进行长途飞行的跨撒哈拉迁徙鸟类，其扩散情况仍鲜为人知。我们于2008年启动了一项环志计划，这在北非尚属首次，在10年里给1121只雏鸟戴上了环志，其中265只（23.6%）被重新发现。出生地扩散的圆形统计和有限混合模型表明：（1）有强烈的西/西北-东/东南飞行方向；（2）来自北非和南欧（特别是伊比利亚半岛）的彩鹮繁殖地通过幼鸟和亚成鸟的部分交换紧密相连；（3）与来自东欧的鸟类不同，北非彩鹮扩散到萨赫勒地区，但似乎不会定期往返迁徙；（4）成年幼鸟（>2岁）比首个日历年的个体（<1岁）有更高的概率扩散到更远的地方；（5）扩散距离不受性别或形态特征的影响。这些结果共同增进了我们对彩鹮扩散和集合种群动态的了解，揭示了伊比利亚半岛和阿尔及利亚之间的大规模连通性，这可能是由这两个地区景观的空间异质性和西地中海的盛行风驱动的。
