Can invasions occur without change? A comparison of G-matrices and selection in the peach-potato aphid, Myzus persicae.
Can invasions occur without change? A comparison of G-matrices and selection in the peach-potato aphid, Myzus persicae.
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DOI：
10.1002/ece3.883
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发表时间：
2013-12
影响因子：
2.6
通讯作者：
Nespolo, Roberto F.
中科院分区：
文献类型：
--
作者：
Bacigalupe, Leonardo D.;Barrientos, Karin;Beckerman, Andrew P.;Carter, Mauricio J.;Figueroa, Christian C.;Foster, Stephen P.;Moore, Allen J.;Silva, Andrea X.;Nespolo, Roberto F.
大多数关于生物入侵的进化研究都集中在特定物种的原生和入侵范围之间的变化。然而，生活在人类改变的栖息地中的物种可能已经进化出对这些环境的特定适应，这增加了在类似的人类改变的环境中定居和传播的可能性。从数量遗传学的角度来看，这一假设表明，本地和引进的人口应该居住在或接近相同的适应性高峰。因此，我们应该观察到没有整体变化的G（遗传方差-协方差）矩阵之间的本地和引进的范围，并在所有群体中的健身相关性状的稳定选择。我们测试了这些预测，比较了来自中东（本地范围）和英国和智利（单独引入的范围）的三个世界性害虫桃蚜种群。总的来说，我们的研究结果为这一想法提供了混合支持，但需要进一步比较其他物种。特别是，我们发现在研究的特征中有一些有限的进化，中东人群与英国和智利人群不同。这反映在G矩阵的结构中，其中智利与英国和中东人口不同。此外，与英国和中东人群相比，智利的遗传变异量大幅减少。最后，我们发现没有检测到的选择在三个群体中的任何性状，但从引进的范围内的克隆开始繁殖后，更小，有更小的后代，并有较低的生殖适合度比从本地范围内的克隆。
Most evolutionary research on biological invasions has focused on changes seen between the native and invaded range for a particular species. However, it is likely that species that live in human-modified habitats in their native range might have evolved specific adaptations to those environments, which increase the likelihood of establishment and spread in similar human-altered environments. From a quantitative genetic perspective, this hypothesis suggests that both native and introduced populations should reside at or near the same adaptive peak. Therefore, we should observe no overall changes in the G (genetic variance–covariance) matrices between native and introduced ranges, and stabilizing selection on fitness-related traits in all populations. We tested these predictions comparing three populations of the worldwide pest Myzus persicae from the Middle East (native range) and the UK and Chile (separately introduced ranges). In general, our results provide mixed support for this idea, but further comparisons of other species are needed. In particular, we found that there has been some limited evolution in the studied traits, with the Middle East population differing from the UK and Chilean populations. This was reflected in the structure of the G-matrices, in which Chile differed from both UK and Middle East populations. Furthermore, the amount of genetic variation was massively reduced in Chile in comparison with UK and Middle East populations. Finally, we found no detectable selection on any trait in the three populations, but clones from the introduced ranges started to reproduce later, were smaller, had smaller offspring, and had lower reproductive fitness than clones from the native range.
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影响因子：
5.9
作者：
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通讯作者：
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