September 1, 1999Biological Journal of the Linnean Society
Integrating molecular genetics and ecology in studies of adaptive radiation: whitefish, Coregonus sp., as a case study
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Discussion
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Implication
Molecular ecological analysis demonstrates parallel ecotype divergence and reproductive isolation in postglacial whitefish, highlighting the joint role of natural selection and genetics in speciation.
Key Points
- To examine the mechanisms of adaptive radiation and speciation in postglacial whitefish by integrating phylogeographic, genetic, and ecological niche analyses.
- Conducted mitochondrial DNA phylogeographic analysis across postglacial lake populations to identify historical lineages originating from Pleistocene glacial refugia.
- Quantified niche partitioning throughout ontogeny and evaluated gene flow across ecotypes using microsatellite loci in relation to morphological specialization.
- Synthesized observational genetic and ecological data with experimental evidence evaluating embryonic mortality in hybrid versus pure ecotype crosses.
- Mitochondrial DNA identified five phylogenetic races surviving distinct glacial refugia, confirming parallel evolution of sympatric ecotypes through both allopatric and sympatric origins.
- Gene flow estimated from microsatellite loci was negatively correlated with morphological specialization between ecotypes across lakes.
- Embryonic mortality rates were 2 to 5 times higher in hybrid crosses compared to pure crosses between ecotypes from different glacial races.
Cite This Study
Bernatchez et al. (1999) studied this question.