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Assortative fertilization and selection at larval stage in the mussels Mytilus edulis and M-galloprovincialis ArchiMer
Bierne, Nicolas; David, Pierre; Boudry, Pierre; Bonhomme, F.
Assortative mating (prezygotic isolation) and reduced hybrid fitness (postzygotic isolation) are typically invoked to explain the stability of hybrid zones. In the tension zone model. these factors work in opposition to migration, which promotes genetic homogeneity. Many marine animals migrate over long distances through a planktonic larval stage. Therefore. strong reproductive isolation is needed to maintain stable marine hybrid zones. However, surprisingly little is known about mating preferences and hybrid fitness in marine organisms. Smooth-shelled mussels (Mytilus spp.) form a well-known species complex, with hybridization over extensive areas such as the contact zone of M. edulis and M. galloprovincialis around European Atlantic coasts. This paper...
Tipo: Text Palavras-chave: Preferential fertilization; Mytilus galloprovincialis; Mytilus edulis; Hybrid viability; Heterosis; Gamete competition.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/publication-2781.pdf
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Can habitat specialisation maintain a mosaic hybrid zone in marine bivalves? ArchiMer
Bierne, Nicolas; David, Pierre; Langlade, Aime; Bonhomme, F.
Maintaining the integrity of differentiated genomes in marine organisms needs efficient isolation mechanisms, because planktonic larval dispersion provides contacts between taxa. Habitat specialisation is interesting in this respect, because it can both prevent interspecific crosses (each taxon reproduces in its own habitat) and eliminate hybrids (typically less fit than a parental taxon in each habitat). The contact zone between smooth-shelled mussels Mytilus edulis and M. galloprovincialis in Europe is a good example, as allozyme genotypes typical of both taxa seem to segregate into different habitats. However, allozymes may be selected directly and it is not known whether the same pattern can be extended to the whole genome. Here, we used 6 presumably...
Tipo: Text Palavras-chave: Habitat specialisation; Hybrid zone; Introgression; Mytilus edulis; Mytilus galloprovincialis.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/00000/10228/7597.pdf
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Fitness landscapes support the dominance theory of post-zygotic isolation in the mussels Mytilus edulis and M. galloprovincialis ArchiMer
Bierne, Nicolas; Bonhomme, Francois; Boudry, Pierre; Szulkin, M; David, Pierre.
We studied the genetic basis of post-zygotic isolation in the marine mussels Mytilus edulis and Mytilus galloprovincialis. Evidence was obtained for a high number of recessive Dobzhansky-Muller substitutions in the genome of these two mussel taxa. We analysed the segregation of unlinked diagnostic markers in the progeny of two backcrosses and an F-2 cross, 36 h and 200 days after fertilization. Directional selection favouring M. galloprovincialis genotypes was observed in both kinds of cross. In the F-2, epistatic interactions between each pair of chromosome fragments mapped by the markers were identified in addition. Our results imply that homozygous-homozygous interactions are required for breakdown of coadaptation, in accordance with the dominance...
Tipo: Text Palavras-chave: Mytilus; Dobzhansky Muller incopatibilities; Post zygotic isolation; Negative epistasis; Hybrid breakdown; Hybrid zone.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1350.pdf
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