A likelihood-based comparison of population histories in a parasitoid guild.
A likelihood-based comparison of population histories in a parasitoid guild.
复制标题
对寄生物行会中种群历史进行基于可能性的比较。
DOI：
10.1111/j.1365-294x.2012.05700.x
复制
发表时间：
2012
影响因子：
4.9
通讯作者：
Lohse K
中科院分区：
文献类型：
--
作者：
Lohse K
在复杂的自然群落中，营养关系在进化时间尺度上的稳定性知之甚少。在这里，我们使用18个核位点的序列数据重建和比较种内历史的主要更新世避难所人口在中东，巴尔干半岛和伊比利亚在公会的四个小蜂寄生虫（Cecidostiba fungosa，Cecidostiba semifascia，Hobbya stenonotaandMesopolobus amaenus）所有攻击Cynipid橡树瘿。我们开发了一种似然方法，从多位点数据的三个群体之间的分歧的数值估计模型。我们调查的权力，这个框架的模拟数据，并使用三重对齐的内含子位点量化支持所有可能的避难所种群之间的分歧关系，在四个寄生虫。虽然从东到西的人口分化顺序在除一个物种外的所有物种中具有最高的支持度，但我们不能排除其他人口树拓扑结构。比较物种之间的人口分裂的估计时间，我们发现，一个物种，M. amaenus，有一个显着的历史比其余的公会，必须到达中欧至少一个冰川周期之前，其他公会成员。这表明，虽然这四个物种可能在东方有着共同的起源，但它们在不同的时间向西扩展到欧洲。
Little is known about the stability of trophic relationships in complex natural communities over evolutionary timescales. Here, we use sequence data from 18 nuclear loci to reconstruct and compare the intraspecific histories of major Pleistocene refugial populations in the Middle East, the Balkans and Iberia in a guild of four Chalcid parasitoids (Cecidostiba fungosa,Cecidostiba semifascia,Hobbya stenonotaandMesopolobus amaenus) all attacking Cynipid oak galls. We develop a likelihood method to numerically estimate models of divergence between three populations from multilocus data. We investigate the power of this framework on simulated data, and—using triplet alignments of intronic loci—quantify the support for all possible divergence relationships between refugial populations in the four parasitoids. Although an East to West order of population divergence has highest support in all but one species, we cannot rule out alternative population tree topologies. Comparing the estimated times of population splits between species, we find that one species,M. amaenus, has a significantly older history than the rest of the guild and must have arrived in central Europe at least one glacial cycle prior to other guild members. This suggests that although all four species may share a common origin in the East, they expanded westwards into Europe at different times.