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首页> 外文期刊>Biochemical Genetics >Genetic Diversity and Population Structure Analysis of Three Deep-Sea Amphipod Species from Geographically Isolated Hadal Trenches in the Pacific Ocean
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Genetic Diversity and Population Structure Analysis of Three Deep-Sea Amphipod Species from Geographically Isolated Hadal Trenches in the Pacific Ocean

机译：太平洋地理上哈瓦尔沟渠的三种深海Amphipod种群遗传多样性和人口结构分析

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摘要

Amphipods of the superfamily Lysianassoidea that inhabit the hadal zone (>6000 m) have large bathymetric ranges and play a key role in deep ocean ecosystems. The endemism of these amphipod species makes them a good model for investigating potent natural selection and restricted dispersal in deep ocean trenches. Here, we describe genetic diversity and intraspecific population differentiation among three amphipod species from four Pacific trenches based on a mtDNA concatenated dataset (CO Iota and 16S rRNA genes) from 150 amphipod individuals. All amphipod populations had low genetic diversity, as indicated by haplotype and nucleotide diversity values. Population geographic relationship analysis of two Alicella gigantea populations revealed no genetic differentiation between these two localities (pairwise genetic differentiation coefficient = 0.00032, gene flow = 784.58), and the major variation (99.97%) was derived from variation within the populations. Historical demographic events were investigated using Tajima's D and Fu's F neutrality tests and analysis of mismatch distribution. Consistent results provided strong evidence to support the premise that demographic expansion occurred only for the Mariana population of Hirondellea gigas, possibly within the last 2.1-3.4 million years. These findings suggest that the formation of amphipod population structure might be the result of multiple factors including high hydrostatic pressure, food distribution, trench topographic forcing and potential ecological interactions.
机译：居住的超家族赖氏莲花藻（> 6000米）的Amphipods具有大量的碱基范围，并在深海生态系统中发挥关键作用。这些Amphipod物种的民族性使它们成为调查深海沟渠中有效的自然选择和限制分散的良好模型。在这里，我们描述了基于来自150个Amphipod个体的MTDNA级联数据集（CO IOTA和16S rRNA基因的四个太平洋沟槽的三个Amphipod物种之间的遗传多样性和拆放人口分化。所有Amphipod群体都有低遗传多样性，如单倍型和核苷酸多样性值所示。群体的群体地理关系分析揭示这两个地方之间没有遗传分化（成对遗传分化系数= 0.00032，基因流= 784.58），并且主要变异（99.97％）来自群体内的变异。使用Tajima的D和Fu的中立测试来调查历史人口事件和不匹配分布分析。一致的结果提供了强有力的证据，以支持人口扩张仅针对Hirondellea Gigas的Mariana人口发生的前提，可能在最后的2.1-340万年内。这些发现表明，AMphipod群体结构的形成可能是多种因素的结果，包括高静水压力，食物分布，沟式地形迫使和潜在的生态相互作用。

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