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首页> 外文期刊>Marine biology >Mitochondrial Dna And Electronic Tracking Reveal Population Structure Of Atlantic Bluefin Tuna (thunnus Thynnus)
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Mitochondrial Dna And Electronic Tracking Reveal Population Structure Of Atlantic Bluefin Tuna (thunnus Thynnus)

机译：线粒体DNA和电子跟踪揭示了大西洋蓝鳍金枪鱼（Thunnus Thynnus）的种群结构

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Population subdivision was examined in Atlantic bluefin tuna (Thunnus thynnus) through sequencing of the control region of the mitochondrial genome. A total of 178 samples from the spawning grounds in the Gulf of Mexico, Bahamas and Mediterranean Sea were analyzed. Among the samples from these locations were 36 electronically tagged bluefin tuna that were tagged in the North Atlantic and subsequently traveled to one of these known spawning grounds during the spawning season. Bluefin tuna populations from the Gulf of Mexico and the Mediterranean Sea were found to be genetically distinct based on Φ_(st), and sequence nearest neighbor analyses, showing that these two major spawning areas support independent stocks. Sequence nearest neighbor analysis indicated significant population subdivision among the Gulf of Mexico, western Mediterranean and eastern Mediterranean Sea. However, it was not possible to find significant pairwise differences between any sampling areas when using all samples. If only samples that had a high likelihood of assignment to a specific spawning site were used (young of the year, spawning adults), the differentiation increased among all sampling areas and the Western Mediterranean Sea was distinct from the Eastern Mediterranean Sea and the Gulf of Mexico. It was not possible to distinguish samples from the Bahamas from those collected at any of the other sampling sites. These data support tagging results that suggested distinctness of the Gulf of Mexico, Eastern and Western Mediterranean Sea spawning areas. This level of stock differentiation is only possible if Atlantic bluefin tuna show strong natal homing to individual spawning grounds.
机译：通过对线粒体基因组控制区进行测序，对大西洋金枪鱼（Thunnus thynnus）中的种群细分进行了检查。总共分析了来自墨西哥湾，巴哈马和地中海产卵场的178个样品。在这些地点的样本中，有36个电子标签的蓝鳍金枪鱼在北大西洋被标记，随后在产卵季节前往这些已知的产卵场之一。根据Φ_（st）和最近邻分析序列，发现墨西哥湾和地中海蓝鳍金枪鱼种群在遗传上是不同的，表明这两个主要产卵区支持独立种群。序列最近邻分析表明，在墨西哥湾，西地中海和东地中海中存在显着的人口细分。但是，在使用所有样本时，不可能在任何样本区域之间发现明显的成对差异。如果仅使用极有可能分配给特定产卵地点的样本（一年中的年轻人，成年产卵），则所有采样区域之间的差异都会增加，并且西地中海与东地中海和墨西哥湾不同墨西哥。无法将巴哈马的样品与在其他任何采样地点采集的样品区分开。这些数据支持标记结果，表明墨西哥湾，东地中海和西地中海产卵区的不同。只有在大西洋蓝鳍金枪鱼对个体产卵场显示出强烈的幼体归巢的情况下，才有可能达到这种种群分化水平。

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