Comparative phylogeography across two trophic levels:: the oak gall wasp Andricus kollari and its chalcid parasitoid Megastigmus stigmatizans
Comparative phylogeography across two trophic levels:: the oak gall wasp Andricus kollari and its chalcid parasitoid Megastigmus stigmatizans
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DOI：
10.1111/j.1365-294x.2005.02811.x
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发表时间：
2006-02-01
影响因子：
4.9
通讯作者：
Stone, GN
中科院分区：
文献类型：
--
作者：
Hayward, A;Stone, GN
昆虫寄生蜂是许多陆地生态系统的重要组成部分。然而，人们对它们种群结构的机制知之甚少。在这里，我们调查了一种栎小蜂寄生小蜂Megastigmus isticzans在两个不同的时间尺度上追踪其宿主Andricus kollari的能力，并通过宿主种群结构的划分来检验其当前的种群结构。这一分界线代表着五倍子寄主植物物种的转变，并提供了机会来检查划分五倍子种群的分裂是否表现在下一个营养级别。对寄生蜂和寄主的线粒体单倍型数据的分析表明：(I)两者具有相似的系统地理种群结构，伊比利亚种群相对于更东部的种群更具衍生性。(2)寄主很可能比寄生蜂更早地在伊比利亚保护区定居，可能至少经历了一个冰川周期。(3)最近中欧寄主种群向北的范围扩大导致了来自相同地理来源的寄生蜂的追捕。(4)此外，伊比利亚寄生蜂种群跨越了寄主种群结构的主要鸿沟，入侵了北欧。这种人类促成的逃离自然避难分布的行为可能对北欧五倍子群落的组成和结构有重要影响。
Insect parasitoids are important components of many terrestrial ecosystems. However, relatively little is known about the mechanisms responsible for structuring their populations. Here we investigate the ability of Megastigmus stigmatizans, an oak gall wasp parasitoid, to track its host Andricus kollari over two different timescales, and examine its current population structure across a divide in host population structure. The divide represents a transition in gall wasp host-plant species and offers the opportunity to examine whether the split, which divides gall wasp populations, manifests itself in the next trophic level. Analysis of mitochondrial haplotype data for parasitoid and host reveals: (i) A similar phylogeographic population structure for both, with Iberian populations more derived with respect to more eastern populations. (ii) It is likely that the host colonized the Iberian refuge earlier than the parasitoid, probably by at least one glacial cycle. (iii) Recent range expansion of central European host populations northwards has resulted in pursuit by parasitoids from the same geographic origin. (iv) In addition, Iberian parasitoid populations have crossed a major divide in host population structure to invade northern Europe. Such human-facilitated escape from natural refugial distributions may have important implications for the composition and structure of northern European gall wasp communities.