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首页> 外文期刊>Estuarine Coastal and Shelf Science >Sharp phylogeographical differentiation near the southern range edge of the silverside Odontesthes nigricans: Distinct peripheral populations and incipient speciation?
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Sharp phylogeographical differentiation near the southern range edge of the silverside Odontesthes nigricans: Distinct peripheral populations and incipient speciation?

机译：Silverside Odontesthes Nigricans南部范围边缘附近的尖锐神话区分：不同的外围人口和初期的形态？

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摘要

The silverside Odontesthes nigricans is the Atheriniform species that reach the southernmost latitude in Patagonia. Its wide distribution ranges from temperate waters in the Atlantic coast of South America (39 degrees S, Buenos Aires Province, Argentina) to the Sub-Antarctic environment of Cape Horn (56 degrees S). A previous study has shown significant intraspecific differences on growth parameters and otolith morphology between the southern peripheral population of O. nigricans in the Beagle Channel and the populations in the Atlantic coast of Tierra del Fuego. In this work, we report the first data on population genetics of O. nigricans along the southern part of its distributional range, including the peripheral populations of Beagle Channel. To examine the genetic variability, we analyzed 224 sequences of 815 bp of mitochondrial control region generated from individuals captured at two sites in the Beagle Channel and six sites at the Atlantic coast. The genetic structure assessment revealed a sharp phylogeographic division between Beagle Channel and the Atlantic coast of Patagonia with a 39.83% of variance among groups. The observed genetic diversity was lower in Beagle Channel than in the Atlantic coast sites and the demographic analyses are compatible with a scenario of past population expansion, especially in Beagle Channel. We hypothesize two possible scenarios: one is a recent colonization of the Beagle Channel from the Atlantic Coast followed by divergence promoted by adaptation to local conditions. On the other hand, population differentiation may have been attained or initiated in allopatric conditions during Quaternary glacial phases and the populations may now be experiencing a secondary contact near the eastern tip of Tierra del Fuego. These hypotheses should be addressed in the future with genomics tools. By now, these populations should be considered as different units for conservation and management purposes.
机译：硝基甘草胺是核仁叶状物种，即到达巴塔哥尼亚最南端的静脉曲张。它的广泛分销范围从南美洲大西洋海岸的温带水域（39摄氏度，布宜诺斯艾利斯省，阿根廷）到山峰喇叭的子南极环境（56摄氏度）。先前的研究表明，在格子渠道南部核心南部的南方周围人口与Tierra del Fuego的大西洋海岸的群体之间的生长参数和右侧形态的显着性矛盾差异。在这项工作中，我们沿着其分布范围的南部南部的O. Nigricans的群体遗传学的第一个数据报告了一份关于南部的群体遗传学数据，包括Beagle渠道的外围人群。为了检查遗传变异性，我们分析了从在比群岛通道的两个站点和大西洋海岸的六个地点捕获的个体产生的224bp的线粒体控制区域序列。遗传结构评估揭示了比尔戈哥犬和大西洋海岸之间的尖锐神奇分裂，群体之间的差异39.83％。观察到的遗传多样性比大西洋海岸地点较低，人口统计分析与过去种群扩张的情景相容，特别是在比格犬渠道中兼容。我们假设两种可能的情景：一个是最近从大西洋海岸的比猎犬渠道定植，然后通过适应局部条件而促进的分歧。另一方面，在第四季冰川阶段期间，可以在分类条件下达到或发起人口分化，并且群体现在可以在Tierra del Fuego东部靠近东部的次要接触。这些假设应该在未来与基因组学工具一起解决。到目前为止，这些人口应被视为保护和管理目的的不同单位。

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  • 来源
    《Estuarine Coastal and Shelf Science》 |2019年第15期|106276.1-106276.6|共6页
  • 作者

    Cocito Laura L.; Ceballos Santiago G.; Fernandez Daniel A.;

  • 作者单位

    Consejo Nacl Invest Cient & Tecn Ctr Austral Invest Cient CADIC Buenos Aires DF Argentina;

    Consejo Nacl Invest Cient & Tecn Ctr Austral Invest Cient CADIC Buenos Aires DF Argentina|UNTDF Inst Ciencias Polares Ambience & Recursos Nat Tie ICPA Ushuaia Tierra Fuego Argentina;

    Consejo Nacl Invest Cient & Tecn Ctr Austral Invest Cient CADIC Buenos Aires DF Argentina|UNTDF Inst Ciencias Polares Ambience & Recursos Nat Tie ICPA Ushuaia Tierra Fuego Argentina;

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  • 正文语种 eng
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  • 关键词

    Silversides; Biogeography; Speciation; Atherinomorpha; Genetic;

    机译：银石;生物地理;形态;atherinomorpha;遗传;

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