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首页> 外文期刊>Fisheries Research >Evidence for fine geographical scale heterogeneity in gene frequencies in yellowfin tuna (Thunnus albacares) from the north Indian Ocean around Sri Lanka
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Evidence for fine geographical scale heterogeneity in gene frequencies in yellowfin tuna (Thunnus albacares) from the north Indian Ocean around Sri Lanka

机译：来自斯里兰卡北部印度洋的黄鳍金枪鱼（Thunnus albacares）基因频率中精细的地理尺度异质性的证据

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摘要

Yellowfin tuna are currently considered by the member nations of the Indian Ocean Tuna Commission to constitute a single stock in the Indian Ocean due to a lack of knowledge about yellowfin tuna population structure in this region. Previous studies of Indian Ocean yellowfin tuna based on morphology and fisheries data have hinted at the presence of multiple stocks in the region, and further, that stocks may mix in the north western Indian Ocean around Sri Lanka. To better understand the genetic stock structure of yellowfin tuna in the north western Indian Ocean, we examined genetic variation in 285 yellowfin individuals collected over a period of 4 years from six fishing grounds around Sri Lanka and a single fishing ground in the Maldive Islands. We screened variation in both the mitochondrial ATPase 6 and 8 region (498bp) and three microsatellite loci. Significant genetic differentiation was detected among sites for mitochondrial DNA (^FdSdT=0.1285, P<0.001) and at two microsatellite loci (FdSdT=0.0164, P<0.001 and FdSdT=0.0064, P<0.001), while spatial analysis of molecular variance of mtDNA data identified three genetically heterogenous groups namely; western, south eastern and all remaining sites. These results suggest the possibility that genetically discrete yellowfin tuna populations may be present in the north western Indian Ocean.
机译：由于缺乏对黄鳍金枪鱼种群结构的了解，印度洋金枪鱼委员会的成员国目前认为黄鳍金枪鱼在印度洋构成单一种群。先前根据形态学和渔业数据对印度洋黄鳍金枪鱼的研究表明，该区域存在多种种群，此外，斯里兰卡北部印度洋西北部种群可能混合。为了更好地了解印度洋西北部黄鳍金枪鱼的遗传种群结构，我们研究了在4年期间从斯里兰卡周围的六个渔场和马尔代夫群岛的一个渔场中收集的285个黄鳍金枪鱼个体的遗传变异。我们筛选了线粒体ATPase 6和8区域（498bp）和三个微卫星基因座的变异。在线粒体DNA（^ FdSdT = 0.1285，P <0.001）和两个微卫星基因座（FdSdT = 0.0164，P <0.001和FdSdT = 0.0064，P <0.001）的位点之间检测到显着的遗传分化。 mtDNA数据确定了三个遗传异质组，即：西部，东南部和所有其余站点。这些结果表明，印度洋西北部可能存在遗传离散的黄鳍金枪鱼种群。

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