Turnover and accumulation of genetic diversity across large time-scale cycles of isolation and connection of populations
Turnover and accumulation of genetic diversity across large time-scale cycles of isolation and connection of populations
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DOI：
10.1098/rspb.2014.1369
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发表时间：
2014-11-07
影响因子：
4.7
通讯作者：
Vuilleumier, Severine
中科院分区：
文献类型：
--
作者：
Alcala, Nicolas;Vuilleumier, Severine
重大气候和地质事件以及人口历史(二次接触)造成了人口隔离和长期和短期联系的循环。最近的经验和理论研究表明，这类事件可能触发快速进化过程，如生态学中常见的池鱼适应性辐射(湖泊和流域的隔离和重新连接)和流行病学中流感病毒的快速适应(宿主中的隔离和重新连接)。我们测试了周期性的种群隔离和联系是否为物种进化和多样化提供了原材料(持续的遗传变异)。我们的分析结果表明，与平衡时的预期相比，种群隔离和联系可以为种群提供更多的遗传多样性。这种过剩要么是循环的(高等位基因周转率)，要么是随着时间的推移而累积的，这取决于隔离的持续时间、连接期和突变率。我们发现动物分支的多样化速率与第四纪气候周期的特定时期有关。最后，我们讨论了我们的结果对于宏观进化模式和从基因组数据推断种群历史的重要性。
Major climatic and geological events but also population history (secondary contacts) have generated cycles of population isolation and connection of long and short periods. Recent empirical and theoretical studies suggest that fast evolutionary processes might be triggered by such events, as commonly illustrated in ecology by the adaptive radiation of cichlid fishes (isolation and reconnection of lakes and watersheds) and in epidemiology by the fast adaptation of the influenza virus (isolation and reconnection in hosts). We test whether cyclic population isolation and connection provide the raw material (standing genetic variation) for species evolution and diversification. Our analytical results demonstrate that population isolation and connection can provide, to populations, a high excess of genetic diversity compared with what is expected at equilibrium. This excess is either cyclic (high allele turnover) or cumulates with time depending on the duration of the isolation and the connection periods and the mutation rate. We show that diversification rates of animal clades are associated with specific periods of climatic cycles in the Quaternary. We finally discuss the importance of our results for macroevolutionary patterns and for the inference of population history from genomic data.