Ecological uncertainty favours the diversification of host use in avian brood parasites
Ecological uncertainty favours the diversification of host use in avian brood parasites
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DOI：
10.1038/s41467-020-18038-y
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发表时间：
2020-08-21
影响因子：
16.6
通讯作者：
Botero, Carlos A.
中科院分区：
文献类型：
--
作者：
Antonson, Nicholas D.;Rubenstein, Dustin R.;Botero, Carlos A.
生态不确定性的适应性反应可能会影响种间相互作用的动态和形状的共生体内的进化过程。专性鸟类育雏寄生虫提供了一个特别容易处理的系统，了解如何不确定性，驱动环境的变化和共生体物候，影响物种相互作用的演变。在这里，我们使用遗传学信息分析和全面的数据集的行为和地理分布的专性鸟类育雏寄生虫和他们的主机证明，越来越多的不确定性，在体温调节和父母的投资寄生青年与主机的丰富性和多样性呈正相关。我们的研究结果是一致的理论预期，生态风险和环境的不可预测性应该有利于发展的赌注对冲。此外，这些高度一致的模式突出的重要作用，生态的不确定性是可能发挥在塑造复杂的种间关系的专业化和普遍性的演变。近17%的鸟类是专性育雏寄生虫的宿主，如常见的杜鹃。Antonson等人的研究表明，当幼仔的养育环境更加不可预测时，寄生虫物种通过将亲代照料外包给更多种类的宿主物种来对冲它们的生殖赌注。
Adaptive responses to ecological uncertainty may affect the dynamics of interspecific interactions and shape the course of evolution within symbioses. Obligate avian brood parasites provide a particularly tractable system for understanding how uncertainty, driven by environmental variability and symbiont phenology, influences the evolution of species interactions. Here, we use phylogenetically-informed analyses and a comprehensive dataset on the behaviour and geographic distribution of obligate avian brood parasites and their hosts to demonstrate that increasing uncertainty in thermoregulation and parental investment of parasitic young are positively associated with host richness and diversity. Our findings are consistent with the theoretical expectation that ecological risks and environmental unpredictability should favour the evolution of bet-hedging. Additionally, these highly consistent patterns highlight the important role that ecological uncertainty is likely to play in shaping the evolution of specialisation and generalism in complex interspecific relationships. Nearly 17% of all bird species are hosts to obligate brood parasites like the common cuckoo. Antonson et al. show that parasite species hedge their reproductive bets by outsourcing parental care to a greater variety of host species when the rearing environment for their young is more unpredictable.