The influence of sea currents, past disruption of gene flow and species biology on the phylogeographical structure of coastal flowering plants
The influence of sea currents, past disruption of gene flow and species biology on the phylogeographical structure of coastal flowering plants
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DOI：
10.1111/j.1365-2699.2008.01973.x
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发表时间：
2009-07-01
影响因子：
3.9
通讯作者：
Kadereit, Joachim W.
中科院分区：
文献类型：
--
作者：
Westberg, Erik;Kadereit, Joachim W.
目的研究两种海岸植物Cakile maritima Scop的地理遗传结构。（菊科）和海刺芹（Eryngium maritimum L.）（伞形科），通过三个海峡和沿着一个连续的海岸伸展使用扩增片段长度多态性（AFLP）。这两个物种具有相似的生态学，因为它们生长在桑迪栖息地，但在生活型（一年生与多年生）和漂浮实验中推断的海水传播种子方面有所不同。海峡的地质历史和现代水流系统各不相同。我们的研究的主要目标是测试的假设，海峡有遗传变异的地理格局的影响，在人口level.LocationThe地区周围的直布罗陀海峡，达达尼尔海峡，博斯普鲁斯海峡和大西洋沿岸的法国西部。MethodsFor这两个物种，我们调查了AFLP变异在几个人口从每个地区。贝叶斯聚类和多样性和分化的措施，用于分析的遗传data.ResultsIn大部分地区的空间遗传结构是相似的两个物种之间。它们在通过直布罗陀和博斯普鲁斯海峡的海岸线上都存在着明显的沿着遗传差距，这些遗传差距与海峡重合。这两个物种显示遗传连续性沿着法国西部海岸。通过达达尼尔海峡发现了一个明显的遗传缺口。maritima，而E.主要结论研究表明，海峡对遗传变异的地理格局有影响。据推测，洋流造成了直布罗陀海峡的遗传差距。在博斯普鲁斯海峡，C.通过达达尼尔海峡，发现的遗传差距可以用这两个海峡过去的封闭以及现在的因素来解释。模拟结果表明，C.通过达达尼尔海峡比通过博斯普鲁斯海峡更容易到达地中海，这不能用这两个海峡地质历史的差异来解释。两种植物在种子传播能力上的差异被认为是导致E. maritimum比C.可以进行直接比较的海洋。
AimWe investigate the geographical genetic structure of two coastal plant species, Cakile maritima Scop. (Brassicaceae) and Eryngium maritimum L. (Apiaceae), through three sea straits and along one continuous stretch of coast using amplified fragment length polymorphisms (AFLPs). The two species have a similar ecology in that they grow in sandy habitats, but differ in life-form (annual vs. perennial) and dispersability of seeds by sea water as inferred from floating experiments. The sea straits differ in their geological history and their modern current systems. The primary goal of our study was to test the hypothesis that sea straits have an influence on the geographical patterns of genetic variation at the population level.LocationThe areas around the Strait of Gibraltar, the Dardanelles, the Bosporus and the Atlantic coast of western France.MethodsFor both species we investigated AFLP variation in several populations from each area. Bayesian clustering and diversity and differentiation measures were used to analyse the genetic data.ResultsIn most areas the spatial genetic structure was similar between the two species. They share the presence of distinct genetic gaps along the coast through the Strait of Gibraltar and the Bosporus, and these genetic gaps coincide with the straits. Both species show genetic continuity along the coast of western France. A distinct genetic gap was found through the Dardanelles for C. maritima but not for E. maritimum.Main conclusionsThe study shows that sea straits have an influence on the geographical patterns of genetic variation. Sea currents are inferred to cause the genetic gap through the Strait of Gibraltar. In the Bosporus and, for C. maritima, through the Dardanelles, the genetic gaps found are explained by the past closure of these two straits as well as by present-day factors. Simulations indicate that the lower differentiation of C. maritima through the Dardanelles than through the Bosporus cannot be explained by the difference in geological history of these two straits. The difference in seed dispersability between the two species is argued to be responsible for the observation that differentiation among genetic clusters is higher in E. maritimum than in C. maritima where a direct comparison is possible.