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Linked selection and recombination rate variation drive the evolution of the genomic landscape of differentiation across the speciation continuum of Ficedula flycatchers.
TLDR
It is concluded that the heterogeneous landscape of differentiation in Ficedula flycatchers evolves mainly as the result of background selection and selective sweeps in genomic regions of low recombination, and the necessity of incorporating linked selection as a null model to identify genome regions involved in adaptation and speciation is emphasized.
Single‐nucleotide polymorphism characterization in species with limited available sequence information: high nucleotide diversity revealed in the avian genome
TLDR
Higher nucleotide diversity in the avian genome could be due to the relatively older age of flycatcher populations, compared with humans, and/or a higher long‐term effective population size.
Sex chromosome evolution and speciation in Ficedula flycatchers
TLDR
It is shown that male plumage traits involved in reinforcing prezygotic isolation in Ficedula flycatcher species are sex linked, suggesting a major role of sex–chromosome evolution in mediating post–and prezyGotic barriers to gene flow and point to a causal link in the development of the two forms of reproductive isolation.
A New Upper Jurassic Ophthalmosaurid Ichthyosaur from the Slottsmøya Member, Agardhfjellet Formation of Central Spitsbergen
TLDR
The paleobiogeographical implications of this result suggest the presence of a single clade of Boreal ophthalmosaurid ichthyosaurs that existed during the latest Jurassic, a pattern also reflected in the high degree of endemicity among some Boreal invertebrates, particularly ammonoids.
Hybrid speciation in sparrows I: phenotypic intermediacy, genetic admixture and barriers to gene flow
TLDR
It is proposed that an origin of hybrid species where the hybrid lineage gets geographically isolated from its parental species, as seems to have happened in this system, might be more common in nature than previously assumed.
Flycatcher song in allopatry and sympatry – convergence, divergence and reinforcement
TLDR
Reinforcement has reduced the frequency of mixed singing in the pied flycatcher and caused a divergence in the song of the collared flycatchers, suggesting that mixed song may increase the rate of maladaptive hybridization.
Sex Chromosome-Linked Species Recognition and Evolution of Reproductive Isolation in Flycatchers
TLDR
It is demonstrated that species recognition is inherited on the Z chromosome, which is also the known location of species-specific male plumage traits and genes causing low hybrid fitness, suggesting that the sex chromosomes may be a hotspot for adaptive speciation.
POPULATION DIVERGENCE IN SEXUAL ORNAMENTS: THE WHITE FOREHEAD PATCH OF NORWEGIAN PIED FLYCATCHERS IS SMALL AND UNSEXY
TLDR
Study of the white forehead patch of male pied flycatchers in a Norwegian population over seven years indicates that females do not use patch size as a mate choice cue, and possible reasons for population divergences are discussed, such as female choice on an alternative secondary sexual character (general plumage color) and speciation among FicedulaFlycatchers.
Speciation, introgressive hybridization and nonlinear rate of molecular evolution in flycatchers
TLDR
It is suggested that the observed deviation from linearity can be explained by a more rapid mutational saturation of the mtDNA sequences than of the nuclear DNA sequences, as supported by analyses of third codon position transversions at two protein coding mtDNA genes.
Differential species recognition abilities of males and females in a flycatcher hybrid zone
TLDR
In two aviary experiments, the hypothesis that males and females prefer to mate conspecifically was tested and it was found that the female showed the strongest sexual response to theconspecific male and the males showed no preference for conspespecific or heterospecific female flycatchers.
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