Ventral colour, not tail streamer length, is associated with seasonal reproductive performance in a Chinese population of Barn Swallows (Hirundo rustica gutturalis)

@article{Liu2018VentralCN,
  title={Ventral colour, not tail streamer length, is associated with seasonal reproductive performance in a Chinese population of Barn Swallows (Hirundo rustica gutturalis)},
  author={Yu Liu and Elizabeth S C Scordato and Rebecca J. Safran and Matthew R. Evans},
  journal={Journal of Ornithology},
  year={2018},
  volume={159},
  pages={675-685}
}
AbstractPhenotypic differentiation is common among populations that have large geographic distributions. One proposed mechanism driving phenotype divergence is sexual selection, which predicts that trait differences among closely related populations are underlain by variation in reproductive performance. Here, we examined a population of Asian Barn Swallows (Hirundo rustica gutturalis) in northeastern China. We ask whether traits shown to be under divergent sexual selection in other Barn… 
Analysing phenotypic variation in barn swallows (Hirundo rustica) across China to assess subspecies status
Phenotypic variation is often used to delineate species and subspecies boundaries. Statistical analysis of phenotypic variation within a species is helpful both for understanding biodiversity and
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Interestingly, it was found that the impact of urbanization was sex‐dependent, negatively affecting males’ body mass, its regression residuals, and females’ wing length, and it was also found that northern and western individuals were larger, regarding both body mass andWing length, than southern and eastern individuals.
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Evidence is found that the barn swallow mating system, demographic history and linked selection each contribute to low Z‐linked diversity and high Z‐ linked differentiation, suggesting that sex‐linked traits are important in reproductive isolation, especially in migratory divide regions.
The role of claw color in species recognition and mate choice in a fiddler crab
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It is found that color is important in conspecific mate recognition but the variation among males in claw “yellowness” is unlikely to be used by females in intraspecific mates choice decisions, and no single component of claw color independently affected female choices.
A migratory divide spanning two continents is associated with genomic and ecological divergence
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Results indicate that assortative mating by timing of arrival and/or selection against hybrids with intermediate migratory traits may maintain reproductive isolation between the subspecies, and that inhospitable geographic features may have contributed to the diversification of Asian avifauna by influencing migratory patterns.
Migratory divides coincide with reproductive barriers across replicated avian hybrid zones above the Tibetan Plateau.
TLDR
The remarkable geographic coincidence between migratory divides and genetic breaks supports a long-standing hypothesis that the Tibetan Plateau is a substantial barrier contributing to the diversity of Siberian avifauna.

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