The architecture of river networks can drive the evolutionary dynamics of aquatic populations
The architecture of river networks can drive the evolutionary dynamics of aquatic populations
复制标题
河流网络的结构可以驱动水生种群的进化动态
DOI：
10.1111/evo.12883
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发表时间：
2016
期刊：
影响因子：
3.3
通讯作者：
L. Knowles
中科院分区：
文献类型：
--
作者：
Andréa T. Thomaz;Mark R. Christie;L. Knowles
人们普遍认为，自然景观可以塑造种群内和种群间的遗传变异。然而，人们还不太清楚河流景观及其复杂的结构如何影响中性遗传多样性的模式。我们使用空间显式基于主体的建模（ABM）方法，评估树枝状河流形状对当地种群结构的遗传后果。我们解开特定的河流属性观察到的遗传变异模式的相对贡献，通过评估不同的分支架构和下游流态如何影响位于河流网络内的种群的遗传结构。不考虑河流的长度，我们的研究结果表明，河流分支的程度，汇合的位置，和水平的不对称的下游迁移决定了河流种群的遗传变异模式。简单和高度分支的河流之间的比较显示，整体遗传多样性增加了20倍，当地种群之间的遗传分化增加了7倍。考虑到大多数河流具有复杂的结构，这些结果突出了将河流景观信息纳入水生物种进化模型的重要性，并有助于解释为什么河流鱼类代表了不成比例的大量的全球脊椎动物多样性，每单位的可居住面积。
It is widely recognized that physical landscapes can shape genetic variation within and between populations. However, it is not well understood how riverscapes, with their complex architectures, affect patterns of neutral genetic diversity. Using a spatially explicit agent‐based modeling (ABM) approach, we evaluate the genetic consequences of dendritic river shapes on local population structure. We disentangle the relative contribution of specific river properties to observed patterns of genetic variation by evaluating how different branching architectures and downstream flow regimes affect the genetic structure of populations situated within river networks. Irrespective of the river length, our results illustrate that the extent of river branching, confluence position, and levels of asymmetric downstream migration dictate patterns of genetic variation in riverine populations. Comparisons between simple and highly branched rivers show a 20‐fold increase in the overall genetic diversity and a sevenfold increase in the genetic differentiation between local populations. Given that most rivers have complex architectures, these results highlight the importance of incorporating riverscape information into evolutionary models of aquatic species and could help explain why riverine fishes represent a disproportionately large amount of global vertebrate diversity per unit of habitable area.