Population structure of Columbia spotted frogs (Rana luteiventris) is strongly affected by the landscape
Population structure of Columbia spotted frogs (Rana luteiventris) is strongly affected by the landscape
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DOI：
10.1111/j.1365-294x.2005.02426.x
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发表时间：
2005-02-01
影响因子：
4.9
通讯作者：
Allendorf, FW
中科院分区：
文献类型：
--
作者：
Funk, WC;Blouin, MS;Allendorf, FW
景观特征，如山脉，河流和生态梯度可能会强烈影响种群之间的扩散和基因流动的模式，从而塑造种群动态和进化轨迹。景观可能对两栖动物的传播模式和基因流动产生特别强烈的影响，因为两栖动物被认为传播能力较差。我们研究了6个微卫星位点的遗传变异哥伦比亚斑点蛙（蛙luteiventris）从28个养殖池在西部蒙大拿州和爱达荷州，美国，以调查景观结构的影响模式的基因流。我们特别感兴趣的是解决三个问题：（一）山脊作为基因流的障碍？00之间的基因流限制低和高海拔池塘？(iii)一个池塘等于一个“随机交配种群"吗？我们发现，山脊和海拔差异与增加网站之间的遗传分化，这表明基因流是限制了山脊和海拔在这个物种。我们还发现，种群的哥伦比亚斑点蛙一般包括一个以上的池塘，除了非常孤立的池塘。还有证据表明，在相隔很远的低海拔地区，基因流动水平高得惊人。此外，种群内的遗传变异与海拔高度呈显著负相关，表明高海拔的有效种群规模远小于低海拔。我们的研究结果表明，景观特征对哥伦比亚斑点蛙的遗传变异模式有着深远的影响。
Landscape features such as mountains, rivers, and ecological gradients may strongly affect patterns of dispersal and gene flow among populations and thereby shape population dynamics and evolutionary trajectories. The landscape may have a particularly strong effect on patterns of dispersal and gene flow in amphibians because amphibians are thought to have poor dispersal abilities. We examined genetic variation at six microsatellite loci in Columbia spotted frogs (Rana luteiventris) from 28 breeding ponds in western Montana and Idaho, USA, in order to investigate the effects of landscape structure on patterns of gene flow. We were particularly interested in addressing three questions: (i) do ridges act as barriers to gene flow? 00 is gene flow restricted between low and high elevation ponds? (iii) does a pond equal a 'randomly mating population' (a deme)? We found that mountain ridges and elevational differences were associated with increased genetic differentiation among sites, suggesting that gene flow is restricted by ridges and elevation in this species. We also found that populations of Columbia spotted frogs generally include more than a single pond except for very isolated ponds. There was also evidence for surprisingly high levels of gene flow among low elevation sites separated by large distances. Moreover, genetic variation within populations was strongly negatively correlated with elevation, suggesting effective population sizes are much smaller at high elevation than at low elevation. Our results show that landscape features have a profound effect on patterns of genetic variation in Columbia spotted frogs.