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首页> 外文期刊>Marine biology >Intraspecific phylogeographic isolation of Arabian Gulf sailfish Istiophorms platypterus inferred from mitochondrial DNA
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Intraspecific phylogeographic isolation of Arabian Gulf sailfish Istiophorms platypterus inferred from mitochondrial DNA

机译：从线粒体DNA推断阿拉伯海湾旗鱼Istiophorms platypterus的种内系统学分离

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The genetic structure of seven sailfish Istiophorus platypterus populations sampled from three locations inside and four locations outside the Arabian Gulf was determined by restriction fragment length polymorphism analysis of mitochondrial DNA of 147 individuals using eight restriction endonucleases. A total of 39 composite haplotypes derived from 27 presumptive restriction sites demonstrated significant differences in frequency between population groups inside and outside the Gulf (analysis of molecular variance 34.80%, P<0.001; F-ST=0.356) and evidence of restricted migration between them (average number of migrants, N-m=0.903). Haplotypes found only inside or outside the Gulf clustered to all major branches of a haplotype phylogeny, as did those found in both areas. The reduced genetic diversity of the Gulf populations and the fact that much of the differentiation between the population groups resulted from differences in haplotype frequency rather than divergence between haplotypes suggest a founder effect and a recent sampling of genotypes from the Indian Ocean. This was probably associated with dispersal into the Gulf after it was flooded by rising sea level after the end of the last glaciation around 8,000 years ago. At some point since then the population has evolved to complete its life cycle within the Gulf and shows a marked disruption to gene flow, consistent with dispersal data, at the Strait of Hormuz. These findings represent the first clear evidence of phylogeographic isolation occurring in a large, highly vagile, predatory istiophorid billfish, within a marginal sea.
机译：通过使用八种限制性内切核酸酶对147个个体的线粒体DNA进行限制性片段长度多态性分析，确定了从阿拉伯湾内三个位置和外四个位置采样的七个旗鱼Istiophorus platypterus种群的遗传结构。共有来自27个假定限制位点的39个复合单倍型显示出海湾内外种群之间频率的显着差异（分子变异分析34.80％，P <0.001； F-ST = 0.356），以及它们之间受限迁移的证据（移民的平均人数，Nm = 0.903）。仅在海湾内部或外部发现的单倍型聚集在单倍系统发育的所有主要分支上，在这两个地区均发现。海湾种群遗传多样性的降低以及种群群之间的很大程度差异是由于单倍型频率的差异而不是单倍型之间的差异所致，这说明了印度洋的奠基者效应和最近对基因型的采样。这可能与大约8000年前最后一次冰川消融结束后海平面上升淹没了海湾后向海湾的扩散有关。从那以后的某个时刻，该种群已经进化完成了其在海湾地区的生命周期，并在霍尔木兹海峡显示出与分散数据一致的基因流显着破坏。这些发现代表了在边缘海域内大型，高度易变的掠食性直纹比目鱼中发生的谱系隔离的第一个明确证据。

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