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首页> 外文期刊>Evolution: International Journal of Organic Evolution >MULTIPLE MODES OF SPECIATION INVOLVED IN THE PARALLEL EVOLUTION OF SYMPATRIC MORPHOTYPES OF LAKE WHITEFISH (COREGONUS CLUPEAFORMIS, SALMONIDAE)
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MULTIPLE MODES OF SPECIATION INVOLVED IN THE PARALLEL EVOLUTION OF SYMPATRIC MORPHOTYPES OF LAKE WHITEFISH (COREGONUS CLUPEAFORMIS, SALMONIDAE)

机译：白斑鱼症状形态特征的平行进化中涉及的多种形态学模式

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We performed a phylogenetic analysis of mtDNA variation among seven sympatric pairs of dwarf and normal morphotypes of whitefish from northern Quebec and the St. John River drainage to address three questions relevant to understanding their radiation. Are all sympatric pairs reproductively isolated? Do phylogenetic analyses confirm that sympatric whitefish morphotypes found in eastern North America represent the outcome of polyphyletic evolutionary events? If so, did all sympatric pairs from the St. John River drainage originate from the same scenario of allopatric divergence and secondary contact? The hypothesis of genetic differentiation was supported for all sympatric pairs from the St. John River drainage, whereas lack of mtDNA diversity precluded any test of reproductive isolation for northern Quebec populations. Patterns of mtDNA variation confirmed that dwarf and normal morphotypes evolved in parallel among independent, yet closely related, lineages, thus providing indirect evidence for the role of natural selection in promoting phenotypic radiation in whitefish. Patterns of mtDNA diversity among sympatric pairs of the St. John River indicated a complex picture of whitefish evolution that implied sympatric divergence and multiple allopatric divergence/secondary contact events on a small geographic scale. These results suggests that ecological opportunities, namely trophic niche availability, may promote population divergence in whitefish. [References: 62]
机译：我们对来自魁北克省北部和圣约翰河排水系统的七个白patri的正常和同型形态的七个同伴对中的mtDNA变异进行了系统发育分析，以解决与了解其辐射有关的三个问题。所有同居伴侣都生殖隔离吗？系统发育分析是否证实在北美东部发现的同卵白鲑形态型代表多系统进化事件的结果？如果是这样，圣约翰河排水系统中的所有同居者对是否都来自同异相发散和二次接触的相同情况？遗传分化的假设得到了圣约翰河流域所有同胞对的支持，而缺乏mtDNA多样性则排除了对魁北克北部人群进行生殖隔离的任何测试。 mtDNA变异的模式证实，矮人和正常形态型在独立但密切相关的谱系中平行进化，因此为自然选择在促进白鱼表型辐射中的作用提供了间接证据。圣约翰河的同胞对之间的mtDNA多样性模式显示了白鱼进化的复杂情况，这暗示着在较小的地理范围内同胞分离和多种异源分离/二次接触事件。这些结果表明，生态机会，即营养生态位的可获得性，可能会促进白鱼的种群分化。 [参考：62]

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