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Träfflista för sökning "WFRF:(Palkopoulou Eleftheria) srt2:(2010)"

Sökning: WFRF:(Palkopoulou Eleftheria) > (2010)

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1.
  • Backström, Niclas, et al. (författare)
  • A high-density scan of the Z chromosome in ficedula flycatchers reveals candidate loci for diversifying selection
  • 2010
  • Ingår i: Evolution. - : Wiley. - 0014-3820 .- 1558-5646. ; 64:12, s. 3461-3475
  • Tidskriftsartikel (refereegranskat)abstract
    • Theoretical and empirical data suggest that genes located on sex chromosomes may play an important role both for sexually selected traits and for traits involved in the build-up of hybrid incompatibilities. We investigated patterns of genetic variation in 73 genes located on the Z chromosomes of two species of the flycatcher genus Ficedula, the pied flycatcher and the collared flycatcher. Sequence data were evaluated for signs of selection potentially related to genomic differentiation in these young sister species, which hybridize despite reduced fitness of hybrids. Seven loci were significantly more divergent between the two species than expected under neutrality and they also displayed reduced nucleotide diversity, consistent with having been influenced by directional selection. Two of the detected candidate regions contain genes that are associated with plumage coloration in birds. Plumage characteristics play an important role in species recognition in these flycatchers suggesting that the detected genes may have been involved in the evolution of sexual isolation between the species.
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2.
  • Backström, Niclas, et al. (författare)
  • No evidence for Z-chromosome rearrangements between the pied flycatcher and the collared flycatcher as judged by gene-based comparative genetic maps
  • 2010
  • Ingår i: Molecular Ecology. - 0962-1083 .- 1365-294X. ; 19:16, s. 3394-3405
  • Tidskriftsartikel (refereegranskat)abstract
    • Revealing the genetic basis of reproductive isolation is fundamental for understanding the speciation process. Chromosome speciation models propose a role for chromosomal rearrangements in promoting the build up of reproductive isolation between diverging populations and empirical data from several animal and plant taxa support these models. The pied flycatcher and the collared flycatcher are two closely related species that probably evolved reproductive isolation during geographical separation in Pleistocene glaciation refugia. Despite the short divergence time and current hybridization, these two species demonstrate a high degree of intrinsic post-zygotic isolation and previous studies have shown that traits involved in mate choice and hybrid viability map to the Z-chromosome. Could rearrangements of the Z-chromosome between the species explain their reproductive isolation? We developed high coverage Z-chromosome linkage maps for both species, using gene-based markers and large-scale SNP genotyping. Best order maps contained 57-62 gene markers with an estimated average density of one every 1-1.5 Mb. We estimated the recombination rates in flycatcher Z-chromosomes to 1.1-1.3 cM/Mb. A comparison of the maps of the two species revealed extensive co-linearity with no strong evidence for chromosomal rearrangements. This study does therefore not provide support the idea that sex chromosome rearrangements have caused the relatively strong post-zygotic reproductive isolation between these two Ficedula species.
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Ellegren, Hans (2)
Backström, Niclas (2)
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Palkopoulou, Elefthe ... (2)
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