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首页> 外文期刊>The ISME journal emultidisciplinary journal of microbial ecology >The anchoring effect-long-term dormancy and genetic population structure
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The anchoring effect-long-term dormancy and genetic population structure

机译：锚定效应长期休眠和遗传人口结构

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摘要

Understanding the genetic structure of populations is key to revealing past and present demographic and evolutionary processes in a species. In the past decade high genetic differentiation has been observed in many microbial species challenging the previous view of cosmopolitan distribution. Populations have displayed high genetic differentiation, even at small spatial scales, despite apparent high dispersal. Numerous species of microalgae have a life-history strategy that includes a long-term resting stage, which can accumulate in sediments and serve as refuge during adverse conditions. It is presently unclear how these seed banks affect the genetic structure of populations in aquatic environments. Here we provide a conceptual framework, using a simple model, to show that long-term resting stages have an anchoring effect on populations leading to increased genetic diversity and population differentiation in the presence of gene flow. The outcome that species with resting stages have a higher degree of genetic differentiation compared to species without, is supported by empirical data obtained from a systematic literature review. With this work we propose that seed banks in aquatic microalgae play an important role in the contradicting patterns of gene flow, and ultimately the adaptive potential and population dynamics in species with long-term resting stages.
机译：了解群体的遗传结构是揭示过去和呈现物种中的人口统计和进化过程的关键。在过去的十年中，许多微生物物种中已经观察到高遗传分化，具有挑战性的多种多样。尽管显而易见的高分子，但群体均表现出高遗传分化，即使是小的空间尺度。许多物种的微藻具有生命历史策略，其包括长期休息阶段，其可以在沉积物中积聚并用作不利条件期间的避难。目前尚不清楚这些种子库如何影响水生环境中群体的遗传结构。在这里，我们提供了一种概念框架，使用简单的模型，表明长期休息阶段对群体的锚定效果导致基因流动存在增加的遗传多样性和人口分化。与物种与物种相比，休息阶段的种类具有更高程度的遗传分化，通过从系统文献综述获得的经验数据支持。通过这项工作，我们提出了水生微藻中的种子库在基因流动的相矛盾模式中发挥着重要作用，并最终具有长期休息阶段的物种的自适应潜力和种群动态。

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