Quantifying drivers of population dynamics for a migratory bird throughout the annual cycle
Quantifying drivers of population dynamics for a migratory bird throughout the annual cycle
复制标题
DOI：
10.1098/rspb.2015.2846
复制
发表时间：
2016-01
期刊：
影响因子：
--
通讯作者：
Clark S. Rushing;T. Ryder;P. Marra
中科院分区：
文献类型：
--
作者：
Clark S. Rushing;T. Ryder;P. Marra
在世界范围内，迁徙物种正在迅速减少，但由于缺乏关于迁徙连通性的信息，以及缺乏量化整个年度周期的环境过程的数据，阻碍了对造成这些下降的因素的理解。在这里，我们将关于迁徙连通性的范围内的信息与全球遥感数据相结合，以量化繁殖和非繁殖环境过程对迁徙鸣鸟(Hylocichla Merelina)种群持续长期下降的相对重要性。与关于候鸟种群数量限制的理论预测一致，我们的结果表明，栖息地丧失和气候是导致所观察到的画眉繁殖丰度下降的原因之一，但繁殖和非繁殖因素的相对重要性是特定于种群的。例如，高丰度核心种群似乎更多地受到栖息地丧失的限制，而低丰度外围种群似乎受到气候驱动的季节性相互作用的限制。此外，我们的分析表明，繁殖栖息地丧失的相对影响至少是同等的非繁殖栖息地丧失的影响的三到六倍，因此区域下降最大的可能是繁殖栖息地的丧失。这些结果突出表明，需要在整个年度周期内实施针对人口的保护战略，以扭转长期下降的趋势。
Worldwide, migratory species are undergoing rapid declines but understanding the factors driving these declines is hindered by missing information about migratory connectivity and the lack of data to quantify environmental processes across the annual cycle. Here, we combined range-wide information about migratory connectivity with global remote-sensing data to quantify the relative importance of breeding and non-breeding environmental processes to persistent long-term population declines of a migratory songbird, the wood thrush (Hylocichla mustelina). Consistent with theoretical predictions about population limitation of migratory birds, our results suggest that habitat loss and climate have contributed to the observed declines in wood thrush breeding abundance, yet the relative importance of breeding versus non-breeding factors is population-specific. For example, high-abundance core breeding populations appear to be more limited by habitat loss, whereas low-abundance, peripheral populations appear to be limited by climate-driven seasonal interactions. Further, our analysis indicates that the relative impact of breeding habitat loss is at least three to six times greater than the impact of equivalent non-breeding habitat loss and therefore the steepest regional declines have likely been driven by the loss of breeding habitat. These results underscore the need for population-specific conservation strategies implemented throughout the annual cycle to reverse long-term declines.