Integrating molecular genetics and ecology in studies of adaptive radiation:: whitefish, Coregonus sp., as a case study
Integrating molecular genetics and ecology in studies of adaptive radiation:: whitefish, Coregonus sp., as a case study
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DOI：
10.1111/j.1095-8312.1999.tb01165.x
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发表时间：
1999-09-01
影响因子：
1.9
通讯作者：
Lu, GQ
中科院分区：
文献类型：
--
作者：
Bernatchez, L;Chouinard, A;Lu, GQ
白鲑（Coregonus sp.）利用冰后期湖泊中发现的生物样品来说明将分子方法和生态方法相结合的好处。一个详细的线粒体DNA的地理分析表明，这个物种复合体是由五个主要的系统发育组确定的种族，幸存下来的更新世冰川在不同的避难所。这也为同域生态类型的平行进化提供了证据，包括异地起源和同域起源。这有力地表明了自然选择在推动它们分化中的作用。生态位划分的比较分析支持的假设，在整个个体发育的差异生态机会的持久性可能是选择力，促进白鱼生态型达到专业化的程度。这些相同的生态过程也负责的可能性，是由一个负面的基因流的程度，估计从微卫星位点之间的生殖隔离的相关性的程度，并在不同的湖泊生态类型之间的形态专业化。然而，以前的实验研究表明，胚胎死亡率是2至5倍高杂交相比，纯杂交的生态型从不同的冰川种族。这表明，遗传和生态机制可能共同作用，以确定物种形成率在白鱼。希望这项研究不仅能进一步激发进化生态学家对分子遗传学的兴趣，也能激发分子学家对生态学的兴趣。促进这些看似遥远的研究领域的融合可能是分子生态学作为一门学科的重要成就。(C)1999年伦敦林奈学会。
Species pairs of whitefish (Coregonus sp.) found in postglacial lakes are used to illustrate the benefits of combining molecular and ecological approaches iel studies of adaptive radiation. A detailed mitochondrial DNA phylogeographic analysis revealed that this species complex is composed of five major phylogenetic groups identifying races that survived the Pleistocene glaciations in distinct refugia. It also provided evidence for parallel evolution of sympatric ecotypes, involving both allopatric and sympatric origins. This strongly indicated the role of natural selection in driving their divergence. A comparative analysis of niche partitioning supported the hypothesis that the persistence of differential ecological opportunity throughout their ontogeny may be the selective force promoting the extent of specialization reached by whitefish ecotypes. The possibility that these same ecological processes are also responsible; was supported by a negative for determining the extent of their reproductive isolation correlation between the extent of gene flow, estimated from microsatellite loci, and that of morphological specialization between ecotypes in different lakes. Previous experimental studies, however, revealed that embryonic mortality rates were 2 to 5 times higher hybrid compared to pure crosses of ecotypes from distinct glacial races. This indicates that both genetic and ecological mechanisms may jointly act to determine speciation rate in whitefish. It is hoped that this study will not only stimulate further the interest of evolutionary ecologists for molecular genetics, but also that of molecularists for ecology. Promoting the fusion of such apparently remote fields of research may represent the must important achievement of molecular ecology as a discipline. (C) 1999 The Linnean Society of London.