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首页> 外文期刊>Marine biology >Population structure and genetic variation of lane snapper (Lutjanus synagris) in the northern Gulf of Mexico
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Population structure and genetic variation of lane snapper (Lutjanus synagris) in the northern Gulf of Mexico

机译：墨西哥湾北部车道鲷（Lutjanus synagris）的种群结构和遗传变异

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摘要

Lane snappers (Lutjanus synagris), sampled from eight localities in the northern Gulf of Mexico (Gulf) and one locality along the Atlantic coast of Florida, were assayed for allelic variation at 14 nuclear-encoded micro-satellites and for sequence variation in a 590 base-pair fragment of the mitochondrially encoded ND-4 gene (mtDNA). Significant heterogeneity among the nine localities in both microsatellite allele and genotype distributions and mtDNA haplotype distributions was indicated by exact tests and by analysis of molecular variance (AMOVA). Exact tests between pairs of localities and spatial analysis of molecular variance (SAMOVA) for both microsatellites and mtDNA revealed two genetically distinct groups: a Western Group that included six localities from the northwestern and northcentral Gulf and an Eastern Group that included three localities, one from the west coast of Florida, one from the Florida Keys, and one from the east (Atlantic) coast of Florida. The between-groups component of molecular variance was significant for both microsatellites (Φ_(CT) = 0.016, P = 0.009) and mtDNA (Φ_(CT) = 0.208, P = 0.010). Exact tests between pairs of localities within each group and spatial autocorrelation analysis did not reveal genetic heterogeneity or an isolation-by-distance effect among localities within either group. MtDNA haplotype diversity was significantly less (P < 0.0001) in the Western Group than in the Eastern Group; microsatellite allelic richness and gene diversity also were significantly less in the Western Grouprn(P = 0.015 and 0.013, respectively). The difference in genetic variability between the two groups may reflect reduced effective population size in the Western Group and/or asymmetric rates of genetic migration. The relative difference in variability between the two groups was substantially greater in mtDNA and may reflect one or more mtDNA selective sweeps; tests of neutrality of the mtDNA data were consistent with this possibility. Bayesian analysis of genetic demography indicated that both groups have experienced a historical decline in effective population size, with the decline being greater in the Western Group. Maximum-likelihood analysis of microsatellite data indicated significant asymmetry in average, long-term migration rates between the two groups, with roughly twofold greater migration from the Western Group to the Eastern Group. The difference in mtDNA variability and the order-of-magnitude difference in genetic divergence between mtDNA and microsatellites may reflect different demographic events affecting mtDNA disproportionately and/or a sexual and/or spatial bias in gene flow and dispersal. The spatial discontinuity among lane snappers in the region corresponds to a known zone of vicariance in other marine species. The evidence of two genetically distinct groupings (stocks) has implications for management of lane snapper resources in the northern Gulf.
机译：从墨西哥北部墨西哥湾（Gulf）的八个地点和佛罗里达州大西洋海岸的一个地点采样的Lane鲷鱼（Lutjanus synagris）在14个核编码的微卫星上进行了等位基因变异分析，并在590中进行了序列变异分析线粒体编码的ND-4基因（mtDNA）的碱基对片段。精确测试和分子变异分析（AMOVA）表明，微卫星等位基因和基因型分布以及mtDNA单倍型分布的9个位置之间存在显着异质性。地点对之间的精确测试以及微卫星和mtDNA的分子变异空间分析（SAMOVA）显示了两个遗传上不同的群体：一个西部群体包括西北西北和中北部海湾的六个地点，一个东部群体包括三个地点，一个来自佛罗里达州西海岸，一个来自佛罗里达礁岛礁，另一个来自佛罗里达州东部（大西洋）海岸。对于微卫星（Φ_（CT）= 0.016，P = 0.009）和mtDNA（Φ_（CT）= 0.208，P = 0.010）而言，分子变异的组间成分均显着。每组内的局部对之间的精确测试和空间自相关分析未显示出遗传异质性或两组内各局部之间的距离隔离效应。西部组的MtDNA单倍型多样性显着低于东部组（P <0.0001）。 Western Grouprn中微卫星等位基因的丰富度和基因多样性也显着降低（分别为P = 0.015和0.013）。两组之间遗传变异的差异可能反映了西部组有效种群的减少和/或遗传迁移率的不对称。两组之间变异性的相对差异在mtDNA中明显更大，可能反映了一个或多个mtDNA选择性扫描。 mtDNA数据的中立性测试与此可能性一致。贝叶斯遗传人口学分析表明，这两个群体的有效人口数量都经历了历史性的下降，而西方群体的下降幅度更大。对微卫星数据的最大似然分析表明，两组之间的平均，长期迁移率存在显着的不对称性，其中从西部组向东部组的迁移大约大两倍。 mtDNA变异性的差异以及mtDNA与微卫星之间遗传差异的数量级差异可能反映了不同的人口统计学事件，它们不成比例地影响mtDNA和/或基因流动和分散的性和/或空间偏向。该区域泳道鲷鱼之间的空间不连续性对应于其他海洋物种的已知变化区。两种遗传上不同的种群（种群）的证据对北部海湾巷鲷鱼资源的管理产生了影响。

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  • 来源
    《Marine biology》 |2009年第9期|1841-1855|共15页
  • 作者

    S. Karlsson; E. Saillant; J. R. Gold;

  • 作者单位

    Center for Biosystematics and Biodiversity, Texas A&M University, College Station, TX 77843-2258, USA;

    Center for Biosystematics and Biodiversity, Texas A&M University, College Station, TX 77843-2258, USA;

    Center for Biosystematics and Biodiversity, Texas A&M University, College Station, TX 77843-2258, USA;

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