Topography of the Andes Mountains shapes the wintering distribution of a migratory bird
Topography of the Andes Mountains shapes the wintering distribution of a migratory bird
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DOI：
10.1111/ddi.12515
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发表时间：
2017-02-01
影响因子：
4.6
通讯作者：
Hobson, Keith A.
中科院分区：
文献类型：
--
作者：
Gonzalez-Prieto, Ana M.;Bayly, Nicholas J.;Hobson, Keith A.
目的在鸟类中，迁徙连接的模式受到整个年周期中经历的景观结构的影响。评估景观格局如何驱动迁徙物种的移动和分布，对于了解迁徙的演变和确定保护优先事项至关重要。我们确定了加拿大莺的迁徙连接性（Cardellina canadensis），一种正在衰退的新热带候鸟，并评估了安第斯山脉对这一山地森林专家冬季种群分布的影响程度。方法通过对越冬在哥伦比亚的加拿大莺的稳定氢同位素分析，推测其繁殖和纳塔尔的起源值（Δ H-2）在羽毛和分配越冬种群繁殖的起源，使用一个已建立的羽毛Δ H-2 isoscape为北美。结果我们发现了强有力的证据，繁殖和越冬的网站之间的平行迁移，引起适度强迁移的繁殖和越冬地区之间的连接。最能解释哥伦比亚安第斯山脉人口分布的模型表明，盆地或山谷内的人口最为相似。这种隔离是显着的，考虑到盆地分开不到300公里的越冬地，而繁殖种群可能会分开超过3000公里，从东到西。主要结论我们的研究结果表明，每个安第斯山脉的高脊柱行为，以塑造冬季分布的个人从不同的繁殖种群。据我们所知，这是第一次证明安第斯山脉的地形可以影响候鸟种群的冬季分布。在加拿大莺的迁徙连接的强度可能会抑制对环境变化的进化反应，更快的人口下降记录在一些东部的繁殖种群可能与栖息地的丧失和当地的环境条件在东安第斯山脉，这些人口的个人更有可能越冬。
Aim In birds, patterns of migratory connectivity are influenced by landscape structure experienced throughout the annual cycle. Assessing how landscape patterns drive the movements and distributions of migratory species is important for understanding the evolution of migration and determining conservation priorities. We determined migratory connectivity in the Canada Warbler (Cardellina canadensis), a declining Neotropical migratory bird, and evaluated the degree to which the Andean mountains influence winter population distribution in this montane forest specialist.Location Seven study regions across the Western, Central, and Eastern Andes of Colombia.Methods We inferred breeding and natal origins of Canada Warblers overwintering in Colombia by analysing stable hydrogen isotope values (delta H-2) in feathers and assigning wintering populations to breeding origins using an established feather delta H-2 isoscape for North America.Results We found strong evidence for parallel migration between breeding and wintering sites, giving rise to moderately strong migratory connectivity between breeding and wintering regions. The model best explaining population distribution in the Colombian Andes implied that populations were most similar within basins or valleys. Such segregation is notable, given that basins are separated by less than 300 km on the wintering grounds, while breeding populations may be separated by more than 3000 km from east to west.Main conclusions Our results suggest that the high spine of each Andean cordillera acts to shape the winter distribution of individuals from different breeding populations. To our knowledge, this is the first demonstration that the topography of the Andean mountains can act to shape the winter distribution of populations of a migratory bird. The strength of migratory connectivity found in Canada Warblers may inhibit evolutionary responses to environmental change, and the more rapid population declines recorded in some eastern breeding populations may be related to habitat loss and local environmental conditions in the Eastern Andes, where individuals from these populations were more likely to overwinter.