Intra-tropical movements as a beneficial strategy for Palearctic migratory birds.
Intra-tropical movements as a beneficial strategy for Palearctic migratory birds.
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DOI：
10.1098/rsos.171675
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发表时间：
2018-01
影响因子：
3.5
通讯作者：
Procházka P
中科院分区：
文献类型：
--
作者：
Koleček J;Hahn S;Emmenegger T;Procházka P
候鸟在返回繁殖之前，经常在它们的非繁殖范围内剧烈移动。个体在何种情况下迁移，种群之间的迁移模式是否一致，以及个体在多大程度上受益于热带内迁移（ITM），这些问题仍未得到解决。我们从欧洲中部和东南部的繁殖种群中跟踪了成年大苇莺Acrocephalus around undinaceus，它们要么呆在一个非繁殖地，要么表现出ITM，即迁移到第二个地点。我们将ITM与描述植被条件的归一化植被指数（NDVI）联系起来，该指数可能反映了这些食虫鸟类的食物丰度。四分之三的鸟类在非繁殖区出现了ITM。非繁殖地的NDVI的极差值和平均值与非繁殖地的NDVI的极差值和平均值无显著差异。候鸟在第1点停留期间，第2点的植被状况优于第1点。候鸟在第2个地点停留期间，第1个地点的植被状况进一步恶化。我们的研究提供的证据表明，与它们离开的地方相比，鸟类可能受益于ITM后环境的改善。
Migratory birds often move significantly within their non-breeding range before returning to breed. It remains unresolved under which circumstances individuals relocate, whether movement patterns are consistent between populations and to what degree the individuals benefit from the intra-tropical movement (ITM). We tracked adult great reed warblers Acrocephalus arundinaceus from a central and a southeastern European breeding population, which either stay at a single non-breeding site, or show ITM, i.e. move to a second site. We related ITM to the normalized difference vegetation index (NDVI) describing vegetation conditions and probably reflecting food abundance for these insectivorous birds. Three-quarters of birds showed ITM across the non-breeding range. We found no difference in range values and mean values of NDVI between the single non-breeding sites of stationary birds and the two sites of moving birds. The vegetation conditions were better at the second sites compared to the first sites during the period which moving birds spent at the first sites. Vegetation conditions further deteriorated at the first sites during the period the moving birds resided at their second sites. Our study provides evidence that birds probably benefit from improved conditions after ITM compared to the conditions at the sites from where they departed.
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影响因子：
1.7
作者：
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通讯作者：
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影响因子：
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作者：
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