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首页> 外文期刊>Marine biology >Cryptic isolation of Gulf of California shovelnose guitarfish evidenced by mitochondrial DNA
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Cryptic isolation of Gulf of California shovelnose guitarfish evidenced by mitochondrial DNA

机译：线粒体DNA证明了加利福尼亚湾鱼的隐密分离

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The shovelnose guitarfish Rhinobatos productus is an evolutionarily, ecologically, and economically important ray, with a continuous distribution from San Francisco, California (USA), to Mazatlan, Sinaloa, and in the Gulf of California (Mexico). Regional studies have revealed morphometric differences between shovelnose from the Gulf of California and the Pacific coast of Baja California, which may result from phenotypic plasticity in the presence of high levels of gene flow or from a degree of genetic differentiation in the presence of cryptic isolation within a continuous distribution. We used PCR-RFLP of the mitochondrial control region to assess the degree of genetic differentiation between Gulf of California and Pacific shovelnose guitarfish. We found very high levels of molecular diversity (averages: h=0.77, pi=1.19%), which may be associated with historically large and stable populations, as well as very significant levels of genetic differentiation between gulf and Pacific samples (chi(2)=64, P<0.0001; Phi(ST)=0.63, P<0.0001, mean nucleotide divergence d=2.47%). We found a deep phylogeographic break between haplotypes from the gulf and the Pacific, which may suggest the existence of cryptic species but clearly indicates more than one evolutionarily significant unit of R. productus. Our results show a pattern of genetic structure and levels of differentiation consistent with the geological history of the region. Furthermore, these findings have wide-ranging implications for the management and conservation of cartilaginous fish in Mexico, as they reveal the existence of biological diversity that will go unnoticed without the genetic scrutiny of intraspecific variation and that is highly relevant for much needed management and conservation efforts.
机译：扁嘴guitar鱼Rhinobatos us是一种进化，生态和经济上很重要的射线，从加利福尼亚的旧金山（美国）到锡那罗亚的马萨特兰和加利福尼亚的海湾（墨西哥）连续分布。区域研究表明，来自加利福尼亚湾和南下加利福尼亚州太平洋沿岸的铲子形态上的形态差异，可能是由于存在高水平基因流时的表型可塑性，也可能是由于内部存在隐蔽分离导致的一定程度的基因分化所致。连续分布。我们使用了线粒体控制区的PCR-RFLP来评估加利福尼亚湾和太平洋扁嘴guitar鱼之间的遗传分化程度。我们发现非常高的分子多样性水平（平均值：h = 0.77，pi = 1.19％），这可能与历史上大而稳定的种群有关，以及海湾和太平洋样本之间的遗传分化水平非常高（chi（2 ）= 64，P <0.0001； Phi（ST）= 0.63，P <0.0001，平均核苷酸差异d = 2.47％）。我们在海湾和太平洋的单倍型之间发现了一个深层的系统地理学断裂，这可能暗示了隐性物种的存在，但清楚地表明了R.productus的一个进化上重要的单位。我们的结果显示了与该地区的地质历史一致的遗传结构和分化水平模式。此外，这些发现对墨西哥软骨鱼类的管理和保护具有广泛的意义，因为它们揭示了生物多样性的存在，如果不进行种内变异的遗传学检查，这些多样性将不会被注意到，并且与急需的管理和保护高度相关努力。

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