Department of Biology, 371 Serra Mall, Stanford University, Stanford, CA 94305-5020, USA.
Mol Ecol. 2011 Nov;20(22):4592-605. doi: 10.1111/j.1365-294X.2011.05295.x. Epub 2011 Oct 19.
An understanding of how ecological traits influence past species response to environmental change can aid our future predictions of species persistence. We used ancient DNA and serial coalescent modelling in a hypothesis-testing framework to reveal differences in temporal genetic variation over 10,000 years for two species of subterranean rodents that currently differ in rarity (abundance, range size and habitat specificity) and mating system, but that reside in the same volcanically active region. Comparative phylochronologic analyses indicated little genetic change and suggest genetic stability in the solitary widespread Ctenomys haigi over thousands of years. In contrast, we found a pattern of haplotypic turnover in the rare and currently endangered Ctenomys sociabilis. Serial coalescent modelling indicated that the best-fit models of microevolutionary change included gene flow between isolated populations for this species. Although C. haigi and C. sociabilis are congeners that share many life history traits, they have behavioural, habitat-preference and population-size differences that may have resulted in contrasting patterns of temporal variation during periods of environmental change.
了解生态特征如何影响过去物种对环境变化的响应，可以帮助我们未来预测物种的存续情况。我们使用古 DNA 和连续合并模型，在一个假设检验框架中，揭示了两种地下啮齿动物在 10000 多年时间内的时间遗传变异差异，这两种啮齿动物目前在稀有性（丰富度、范围大小和栖息地特异性）和交配系统方面存在差异，但它们都居住在同一个火山活跃地区。比较古生物chronology 分析表明，在几千年的时间里，独居的广泛分布的 Ctenomys haigi 遗传变化很小，表明遗传稳定性。相比之下，我们发现稀有且目前濒危的 Ctenomys sociabilis 存在单倍型更替模式。连续合并模型表明，该物种微进化变化的最佳拟合模型包括隔离种群之间的基因流动。尽管 C. haigi 和 C. sociabilis 是具有许多生活史特征的同属物种，但它们具有行为、栖息地偏好和种群大小的差异，这可能导致在环境变化期间出现不同的时间变化模式。
