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首页> 外文期刊>Marine biology >Genetic evidence for the existence of cryptic species in an endangered clam Coelomactra antiquata
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Genetic evidence for the existence of cryptic species in an endangered clam Coelomactra antiquata

机译：濒临灭绝的蛤Co斑潜蝇中隐性物种存在的遗传证据

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摘要

Coelomactra antiquata is a commercially important bivalve species, but has been suffering from severe population decline due to over-exploitation and the deterioration of environmental conditions. Previous genetic survey of C. antiquata conducted with allozymes combined with morphology revealed high levels of genetic differentiation between northern and southern populations which suggests a cryptic species might exist in C. antiquata. To test this hypothesis, amplified fragment length polymorphisms (AFLPs) and 16S rRNA gene sequence were used to re-evaluate the spatial genetic structure of six populations of C. antiquata along the coast of China. Both genetic markers display a sharp genetic break between the four northern populations (northern lineage) and two southern population (southern lineage). Large numbers of private alleles (AFLP) were found within the northern or southern populations and a deep divergence of about 6.5% in 16S rRNA gene sequence between the northern and southern lineages suggests the occurrence of potential cryptic or sibling species of C. antiquata. Applying previously published rates of mutation, divergence between the two lineages is estimated to have occurred approximately 3 million years ago and may be due to allopatric isolation during the middle Pliocene times. While no genetic differentiation was found within the northern or southern populations in both AFLP and 16S mtDNA markers, the results indicate that the northern and southern lineage should be managedrnseparately and any translocation between the two areas should be avoided.
机译：腔棘古猿是一种商业上重要的双壳类物种，但由于过度开发和环境条件的恶化，种群数量急剧下降。先前使用等位酶结合形态学对古猿衣原体进行的遗传调查显示，北部和南部种群之间存在高水平的遗传分化，这表明古猿衣原体中可能存在一种隐性物种。为了验证这一假设，使用扩增的片段长度多态性（AFLP）和16S rRNA基因序列重新评估了中国沿海六个C. antiquata种群的空间遗传结构。两种遗传标记均显示出四个北方种群（北谱系）和两个南方种群（南谱系）之间的遗传突变。在北部或南部种群中发现了大量私人等位基因（AFLP），并且在北部和南部谱系之间的16S rRNA基因序列中存在约6.5％的深差异，表明存在潜在的隐隐梭状隐孢或同胞物种。应用以前公布的突变率，估计这两个谱系之间的分歧大约发生在三百万年前，这可能是由于上新世中期的异相隔离所致。虽然在AFLP和16S mtDNA标记的北部或南部种群中均未发现遗传分化，但结果表明，应该分开管理北部和南部血统，并且应避免在两个区域之间发生任何易位。

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  • 来源
    《Marine biology》 |2009年第7期|1507-1515|共9页
  • 作者

    Lingfeng Kong; Qi Li;

  • 作者单位

    Fisheries College, Ocean University of China, 266003 Qingdao, China;

    Fisheries College, Ocean University of China, 266003 Qingdao, China;

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