Ecological genetics of range size variation in Boechera spp. (Brassicaceae)
Ecological genetics of range size variation in Boechera spp. (Brassicaceae)
复制标题
Boechera spp 范围大小变异的生态遗传学。
作者：
J. Lovell;J. McKay
摘要 许多分类群既包含稀有物种，也包含广泛分布的物种，这表明范围大小可以快速演变。许多研究比较了稀有物种和广泛物种之间的分子遗传多样性、可塑性或表型特征；然而，一套将稀有物种结合在一起的遗传属性仍然难以捉摸。在这里，我们使用两种稀有和两种广泛分布的 Boechera（十字花科）物种，对范围大小差异很大的物种之间的数量性状多样性、遗传多样性和种群结构进行了同步比较。与之前的研究一致，我们没有发现范围大小和群体内遗传多样性之间存在很强的关联。相反，我们发现表型可塑性程度和数量性状结构（Q ST）均与范围大小呈正相关。我们还发现稀有物种的 F ST：Q ST 比率较高，表明对稳定选择的反应更大或缺乏加性遗传变异。虽然分布广泛的物种占据了更多的生态和气候空间，并且在性状和标记上都存在差异，但稀有物种的种群分化和表型可塑性水平受到限制。综上所述，我们的结果为生态模型属 Boechera 中三个数量级的范围大小变化之间的专业化与泛化权衡提供了证据。
Abstract Many taxonomic groups contain both rare and widespread species, which indicates that range size can evolve quickly. Many studies have compared molecular genetic diversity, plasticity, or phenotypic traits between rare and widespread species; however, a suite of genetic attributes that unites rare species remains elusive. Here, using two rare and two widespread Boechera (Brassicaceae) species, we conduct a simultaneous comparison of quantitative trait diversity, genetic diversity, and population structure among species with highly divergent range sizes. Consistent with previous studies, we do not find strong associations between range size and within‐population genetic diversity. In contrast, we find that both the degree of phenotypic plasticity and quantitative trait structure (Q ST) were positively correlated with range size. We also found higher F ST: Q ST ratios in rare species, indicative of either a greater response to stabilizing selection or a lack of additive genetic variation. While widespread species occupy more ecological and climactic space and have diverged at both traits and markers, rare species display constrained levels of population differentiation and phenotypic plasticity. Combined, our results provide evidence for a specialization–generalization trade‐off across three orders of magnitude of range size variation in the ecological model genus, Boechera.
DOI：
--
发表时间：
2015-10
期刊：
--
影响因子：
--
作者：
Douglas M. Bates;M. Maechler;Ben Bolker;Steven C. Walker
通讯作者：
Douglas M. Bates;M. Maechler;Ben Bolker;Steven C. Walker
影响因子：
3
作者：
Leinonen, Paivi H.;Sandring, Saskia;Savolainen, Outi
通讯作者：
Savolainen, Outi