Does stress response predict return rate in a migratory bird species? A study of American redstarts and their non-breeding habitat
Does stress response predict return rate in a migratory bird species? A study of American redstarts and their non-breeding habitat
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DOI：
10.1098/rspb.2009.0868
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发表时间：
2009-10-07
影响因子：
4.7
通讯作者：
Marra, Peter P.
中科院分区：
文献类型：
--
作者：
Angelier, Frederic;Holberton, Rebecca L.;Marra, Peter P.
在脊椎动物中，肾上腺皮质应激反应会激活一个紧急的生活史阶段，这被认为是通过帮助个体逃离危及生命的情况来促进生存。尽管肾上腺皮质应激反应促进了许多行为和生理变化，但在野生脊椎动物中，这种应激反应是否真的能转化为更高的生存率仍不清楚。我们测量了非繁殖期的美洲红尾鸲（Setophaga ruticilla）的肾上腺皮质应激反应，这是一种在适宜性高（红树林）或低（灌木丛）的栖息地越冬的候鸟，随后监测了它们在接下来的非繁殖季节的返回率。在整个非繁殖季节，个体的肾上腺皮质应激反应强度是一致的，并且在灌木丛中越冬的红尾鸲的返回率与之呈正相关，但在红树林中越冬的红尾鸲则没有这种相关性。因此，个体对压力做出生理反应的能力以一种依赖环境的方式决定了其在接下来的冬季返回非繁殖地的能力。对于个体来说，产生重要的肾上腺皮质应激反应的能力可能有利于生存。然而，这种有益影响可能取决于个体的环境和表型特征，因为这两个变量可能会影响其在年度生命周期中面临危及生命的应激源的概率。
In vertebrates, the adrenocortical stress response activates an emergency life-history stage, which is thought to promote survival by helping individuals escape life-threatening situations. Although the adrenocortical stress response promotes many behavioural and physiological changes, it remains unclear whether this stress response actually translates into higher survival in wild vertebrates. We measured the adrenocortical stress response of non-breeding American redstarts (Setophaga ruticilla), a migratory bird that wintered in habitats of either high (mangroves) or low suitability (scrubs), and subsequently monitored their return rate during the following non-breeding seasons. The intensity of the adrenocortical stress response was consistent within individuals across the non-breeding season and was positively correlated with return rates in redstarts that wintered in scrubs, but not in redstarts that wintered in mangroves. Thus, in a context-dependent manner, the ability of an individual to physiologically react to stress determines its ability of returning to its non-breeding territory the following winters. For an individual, the ability to mount an important adrenocortical stress response probably benefits to survival. However, this beneficial effect probably depends on an individual's environment and phenotypic characteristics because these two variables are likely to affect its probability of being confronted with life-threatening stressors during its annual life cycle.