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Extra pair paternity in birds: a review of interspecific variation and adaptive function
TLDR
The remaining challenges of understanding the relative roles of genes and ecology in determining variation between taxa in the rate of extra paternity are highlighted, and testing for differences between extra‐pair offspring and those sired within‐pair is highlighted.
Ultraviolet colour variation influences blue tit sex ratios
TLDR
Experimental evidence that females skew the sex ratio of their offspring in response to the ultraviolet plumage ornamentation of their mates is reported, suggesting that chromosomal sex determination may not constrain the sex ratios of multiparous vertebrates.
Stable recombination hotspots in birds
TLDR
To study the evolution and determinants of recombination in species lacking the gene that encodes PRDM9, fine-scale genetic maps from population resequencing data for two bird species found that both species have recombination hotspots, which are enriched near functional genomic elements.
Contrasting levels of extra-pair paternity in mainland and island populations of the house sparrow (Passer domesticus): is there an «island effect»?
TLDR
The analysis of the genetic mating system of two populations of the house sparrow and uses the results from four other populations to test existing hypotheses using an intra-specific comparative approach to find no effect of breeding density and genetic variation on the level of extra-pair paternity.
Hybridization and adaptive mate choice in flycatchers
TLDR
It is shown that, paradoxically, pairing with another species may offer the best fitness return for an individual, despite reduced fitness of hybrid offspring, and appears to represent adaptive mate choice under some circumstances.
Sexual variation in heritability and genetic correlations of morphological traits in house sparrow (Passer domesticus)
TLDR
The results suggest that sex‐specific additive genetic variances and covariances, although ignored in most studies, should be included when making predictions of evolutionary changes from standard quantitative genetic models.
Seasonal changes in a ultraviolet structural colour signal in blue tits, Parus caeruleus
TLDR
It is suggested that it is important to consider plumage age when exploring variation in structural plumage coloration, and that it can largely explain the difference between the British and Swedish studies.
Extra‐pair paternity in birds
TLDR
It is argued that variation in EPP can be partly explained when taking the right perspective, and certain behaviours and ecological variables might facilitate or constrain EPP, as indicated by the finding that EPP was negatively associated with latitude within noncolonial species, suggesting a role of breeding synchrony.
Correlations between ultraviolet coloration, overwinter survival and offspring sex ratio in the blue tit
TLDR
The correlations that are found are consistent with models of adaptive sex ratio adjustment in response to mate quality, but careful experimental work is required to provide tests of the assumptions of these models, and should be a priority for future work.
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