Multidimensional environmental influences on timing of breeding in a tree swallow population facing climate change.
Multidimensional environmental influences on timing of breeding in a tree swallow population facing climate change.
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DOI：
10.1111/eva.12315
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发表时间：
2015-12
影响因子：
4.1
通讯作者：
Garant D
中科院分区：
文献类型：
--
作者：
Bourret A;Bélisle M;Pelletier F;Garant D
大多数物候性状对当前的气候变化极其敏感，许多物种都观察到了重要生活史事件的时间安排的进展。在鸟类中，对温度的表型可塑性被认为是繁殖时间每年调整的主要机制。然而，其他因素也可能很重要，并相互作用，影响个体之间和/或个体内部的可塑性反应水平。在这里，我们使用长期的基于个体的树燕数据来识别影响产蛋期可塑性的空间和环境驱动因素，并评估它们在种群和个体水平上的重要性。研究发现，产蛋期比10年前提前了4.2天，主要受纬度和春季温度与种鸡密度互作的影响。对个体可塑性的分析表明，温度的升高，而不是繁殖者密度的增加，导致了个体内产蛋期的提前。我们的结果表明，雌性可以根据温度调整产卵日期，但这种调整在繁殖者密度较低的栖息地将受到部分限制。这种潜在的限制尤其令人担忧，因为由于气候变化，已经在减少的物种种类繁多。
Most phenological traits are extremely sensitive to current climate change, and advances in the timing of important life-history events have been observed in many species. In birds, phenotypic plasticity in response to temperature is thought to be the main mechanism underlying yearly adjustment in the timing of breeding. However, other factors could be important and interact to affect the levels of plastic responses between and/or within-individuals. Here, we use long-term individual-based data on tree swallow (Tachycineta bicolor) to identify the spatial and environmental drivers affecting plasticity in laying date and to assess their importance at both population and individual levels. We found that laying date has advanced by 4.2 days over 10 years, and that it was mainly influenced by latitude and an interaction between spring temperature and breeder density. Analyses of individual plasticity showed that increases in temperature, but not in breeder density, resulted in within-individual advances in laying date. Our results suggest that females can adjust their laying date as a function of temperature, but that this adjustment will be partly constrained in habitats with lower breeder densities. Such potential constraint is especially worrying for the broad array of species already declining as a result of climate change.