Whole genome data reveal the complex history of a diverse ecological community
Whole genome data reveal the complex history of a diverse ecological community
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全基因组数据揭示了多样化生态群落的复杂历史
DOI：
10.1101/233759
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Bunnefeld L
中科院分区：
文献类型：
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作者：
Bunnefeld L
生态群落如何广泛聚集仍然是生态学中的一个关键问题。广布种之间的营养相互作用可能反映了一个共同的人口历史或生态拟合的地方池的物种非常不同的人口历史。哪一种情况适用是核心的营养协会的稳定性和物种之间的共同进化的潜力。在这里，我们展示了如何替代社区组装假说可以区分使用全基因组数据的组成物种，并提供了一个可能性框架，克服了目前的限制，在正式比较多物种的历史。我们说明了我们的方法，推断组装历史的西部古北界的食草昆虫和寄生天敌，营养组，共同组成的陆地物种的50%。我们拒绝从一个共同的起源和延迟的敌人追求他们的食草动物主机的codepressive模型，反对食草动物实现的“无敌人的空间。”物种扩张时间的群落分布也与随机的、中性的组装模型不相容。相反，我们揭示了一个复杂的组装历史的单一和多物种的范围扩张，通过更新世从不同的方向和时间尺度的范围。我们的研究结果表明，在物种协会的大量营业额，并反对在这个系统中紧密的共同进化。我们说明的方法是广泛适用于自然群落的非模式物种，并使之有可能揭示的历史背景下，自然选择的行为。
How widespread ecological communities assemble remains a key question in ecology. Trophic interactions between widespread species may reflect a shared population history or ecological fitting of local pools of species with very different population histories. Which scenario applies is central to the stability of trophic associations and the potential for coevolution between species. Here we show how alternative community assembly hypotheses can be discriminated using whole-genome data for component species and provide a likelihood framework that overcomes current limitations in formal comparison of multispecies histories. We illustrate our approach by inferring the assembly history of a Western Palearctic community of insect herbivores and parasitoid natural enemies, trophic groups that together comprise 50% of terrestrial species. We reject models of codispersal from a shared origin and of delayed enemy pursuit of their herbivore hosts, arguing against herbivore attainment of “enemy-free space.” The community-wide distribution of species expansion times is also incompatible with a random, neutral model of assembly. Instead, we reveal a complex assembly history of single- and multispecies range expansions through the Pleistocene from different directions and over a range of timescales. Our results suggest substantial turnover in species associations and argue against tight coevolution in this system. The approach we illustrate is widely applicable to natural communities of nonmodel species and makes it possible to reveal the historical backdrop against which natural selection acts.