Massive transoceanic gene flow in a freshwater turtle (Testudines: Geoemydidae: Mauremys rivulata)
Massive transoceanic gene flow in a freshwater turtle (Testudines: Geoemydidae: Mauremys rivulata)
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DOI：
10.1111/zsc.12055
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发表时间：
2014-07
影响因子：
2.5
通讯作者：
M. Vamberger;H. Stuckas;D. Ayaz;P. Lymberakis;P. Široký;U. Fritz
中科院分区：
文献类型：
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作者：
M. Vamberger;H. Stuckas;D. Ayaz;P. Lymberakis;P. Široký;U. Fritz
淡水龟 Mauremys rivulata 的分布范围从巴尔干半岛的亚得里亚海沿岸穿过爱琴海地区以及土耳其西部和南部沿海地区，向南到达以色列。此外，它还出现在爱琴海的几个岛屿、克里特岛和塞浦路斯。先前使用线粒体DNA序列进行的研究发现，尽管陆地和淡水生物群存在一些主要的生物地理障碍，但在其分布范围内实际上没有遗传分化。因此，不存在任何系统发育地理分化是出乎意料的。为了重新检查 M. rivulata 内的遗传分化，我们使用了 13 个未连锁的多态性微卫星位点的全面范围采样和信息，并将这些数据与 mtDNA 变异进行比较。我们的微卫星分析揭示了脆弱的种群结构，然而，这与大多数生物地理障碍相冲突。我们得出的结论是，绝大多数物种范围内的遗传结构是由大规模的跨洋基因流塑造的。对于最北端的海龟种群来说，这种解释不太可能，因为它们的基因似乎受到了故意释放的外来海龟的影响。
The freshwater turtle Mauremys rivulata ranges from the Adriatic coast of the Balkan Peninsula through the Aegean region and coastal western and southern Turkey southwards to Israel. In addition, it occurs on several Aegean islands, Crete and Cyprus. Previous investigations using mtDNA sequences found virtually no genetic differentiation across its distribution range, despite some major biogeographical barriers for terrestrial and freshwater biota. Thus, the absence of any phylogeographical differentiation would be unexpected. To re‐examine genetic differentiation within M. rivulata, here we use a comprehensive rangewide sampling and information of 13 unlinked polymorphic microsatellite loci and compare these data against mtDNA variation. Our microsatellite analyses reveal a weak population structuring which conflicts, however, with most biogeographical barriers. We conclude that the genetic structure in the vast majority of the species' range has been shaped by massive transoceanic gene flow. This explanation is unlikely for the northernmost populations, which seem rather to be genetically impacted by intentionally released foreign turtles.