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首页> 外文期刊>Journal of Parasitology >Phylogeography and demographic history of Gotocotyla sawara (Monogenea: Gotocotylidae) on Japanese Spanish mackerel (Scomberomorus niphonius) along the coast of China.
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Phylogeography and demographic history of Gotocotyla sawara (Monogenea: Gotocotylidae) on Japanese Spanish mackerel (Scomberomorus niphonius) along the coast of China.

机译：中国沿海日本Japanese鱼（Scomberomorus niphonius）上的锯齿蛾（Gotocotyla sawara）（Monogenea：Gotocotylidae）的系统记录和人口统计历史。

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Recent studies indicate that the northwestern Pacific Ocean is an ideal system in which to study and understand the roles of the Pleistocene sea-level fluctuations and ocean currents in shaping phylogeographic patterns of species, but most of these investigations have been concerned with vertebrates, and only a few have focused on invertebrates. In the present study, we examined the genetic population structure and historic demography of a platyhelminth species, Gotocotyla sawara (Monogenea, Gotocotylidae), a gill parasite of Japanese Spanish mackerel, Scomberomorus niphonius, along the coast of China. A fragment of the mitochondrial cytochrome oxidase I (COI) gene for 169 individuals and the internal transcribed spacers for 24 individuals were sequenced from specimens representing 8 populations of this parasite along the coast of China. High levels of COI haplotype diversity (0.9994) and nucleotide diversity (0.015805) were detected for G. sawara. Phylogenetic analysis revealed no phylogeographical pattern for G. sawara in the sample area. Analysis of molecular variance (AMOVA) revealed no significant differences at all hierarchical levels, and pairwise FST analysis demonstrated a high rate of gene flow of this parasite among different populations in coastal Chinese waters. Moreover, the exact test of differentiation supported the null hypothesis that G. sawara along the coast of China constitutes a panmictic population. Both neutrality tests and mismatch distribution revealed that G. sawara underwent population expansion in the late Pleistocene era. Recent range expansion after the last glacial maximum and insufficient time to attain migration-drift equilibrium may account in part for the lack of genetic structure in the geographic areas considered in this study. Dispersal of parasite eggs and larvae along ocean currents, coupled with the long-distance migrations of host fishes, could also be responsible for genetic homogeneity of this parasite. It is also possible that other hosts of this monogean, such as the ridged-eye flounder, Pleruonichthys cornutus, may contribute to the genetic mixing of Gotocotyla sawara populations.
机译：最近的研究表明，西北太平洋是研究和了解更新世海平面涨落和洋流在塑造物种系统地理学模式中的作用的理想系统，但是这些研究大多数与脊椎动物有关，并且仅一些专注于无脊椎动物。在本研究中，我们研究了中国沿岸的日本寄生鲭鱼S（Scomberomorus niphonius）的Go寄生虫，一种蠕虫（Ptoheltythawawara，Monogenea，Gotocotylidae）的遗传种群结构和历史人口统计学。从代表中国沿海8个寄生虫种群的标本中测序了169个个体的线粒体细胞色素氧化酶I（COI）基因的片段和24个个体的内部转录间隔子。锯齿状假单胞菌检测到高水平的COI单倍型多样性（0.9994）和核苷酸多样性（0.015805）。系统发育分析表明在样品区域中没有锯齿杆菌的系统地理特征。分子变异分析（AMOVA）显示在所有层次上均无显着差异，而成对的F <​​sub> ST 分析表明，该寄生虫在中国沿海水域不同种群之间的基因流率很高。此外，精确的区分检验支持零假设，即中国沿海地区的锯齿G（G。sawara）构成恐慌种群。中立性测试和错配分布都表明，锯齿山羊草在更新世晚期经历了种群扩展。在最后一次冰川最大期之后最近的范围扩展和没有足够的时间来达到迁移漂移平衡可能部分解释了本研究中所考虑的地理区域缺乏遗传结构的原因。沿洋流传播的寄生虫卵和幼虫，加上宿主鱼的长距离迁移，也可能是造成这种寄生虫遗传同质的原因。这种独角兽的其他寄主，例如棱角比目鱼，Pleruonichthys cornutus，也可能有助于锯齿Gotocotyla sawara种群的遗传混合。

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