Remnant Rhine delta population of Great Reed Warblers maintains high diversity in migration timing, stopping sites, and winter destinations

IF 1.5 4区 环境科学与生态学 Q3 BIODIVERSITY CONSERVATION
Jan van der Winden, Peter W. van Horssen, Symen Deuzeman, Theunis Piersma
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引用次数: 0

Abstract

Many Afro-Palearctic songbird migrants have declined, with conservation efforts mainly focused on the restoration of breeding habitat. However, pressures outside the breeding season might play a role. This includes the possibility that local relict populations no longer maintain the original phenotypic variation in migration patterns, with a loss of flexibility. The Great Reed Warbler Acrocephalus arundinaceus kept stable population levels in central and eastern Europe, but was almost extinct in the western part of the breeding range. In the Rhine delta the population declined from 10,000 individuals around 1950, to fewer than 100 at present. Here we document migratory timing, routes, and destinations of members of this remnant songbird population. It turned out that the remaining adults still showed high diversity in migratory phenotypes. This is even true in each of the two last tiny subpopulations in the Netherlands (of 50 and 15 pairs). So, even very small populations maintain the possible adaptive phenotypic variation, and with hindsight this justifies the breeding habitat restoration efforts currently underway.

莱茵河三角洲大苇莺残余种群在迁徙时间、停留地点和越冬目的地方面保持高度多样性
许多非洲-北极地区的鸣禽迁徙者数量减少,保护工作主要集中在恢复繁殖栖息地上。然而,繁殖季节之外的压力可能也是原因之一。这包括当地的孑遗种群可能不再保持迁徙模式原有的表型变化,从而丧失了灵活性。大苇莺 Acrocephalus arundinaceus 在中欧和东欧的种群数量保持稳定,但在繁殖地西部几乎灭绝。莱茵河三角洲的种群数量从 1950 年前后的 10,000 只下降到现在的不到 100 只。在这里,我们记录了这一残余鸣禽种群成员的迁徙时间、路线和目的地。结果发现,残存的成鸟在迁徙表型上仍然表现出高度的多样性。甚至在荷兰最后的两个小亚种群(分别为 50 对和 15 对)中也是如此。因此,即使是非常小的种群也能保持可能的适应性表型变异,事后看来,这也证明了目前正在进行的繁殖栖息地恢复工作是正确的。
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来源期刊
CiteScore
3.40
自引率
6.20%
发文量
50
审稿时长
>12 weeks
期刊介绍: Bird Conservation International is a quarterly peer-reviewed journal that seeks to promote worldwide research and action for the conservation of birds and the habitats upon which they depend. The official journal of BirdLife International, it provides stimulating, international and up-to-date coverage of a broad range of conservation topics, using birds to illuminate wider issues of biodiversity, conservation and sustainable resource use. It publishes original papers and reviews, including targeted articles and recommendations by leading experts.
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