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Avian egg colour and sexual selection: does eggshell pigmentation reflect female condition and genetic quality?
The hypothesis that egg colour is a sexually selected signal of the laying female's genetic quality to its mate in order to induce a higher allocation of paternal care can be applied to animals with colourful eggs and paternal care.
Are avian blood parasites pathogenic in the wild? A medication experiment in blue tits (Parus caeruleus)
Medicated females may be able to devote more resources to parental care through being released from the drain imposed upon them by parasites and/or through a reduced allocation to an immune response, adding support to previous findings relating host's life–history traits and haematozoan infections.
Linked selection and recombination rate variation drive the evolution of the genomic landscape of differentiation across the speciation continuum of Ficedula flycatchers.
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.
A sexually selected character displacement in flycatchers reinforces premating isolation
In populations where two species coexist, it is shown that female choice selects for a divergence in male plumage colour and that the resulting character displacement reduces the frequency of hybridization.
Strategies of mass change in breeding birds
From a revision of the literature, it is deduced that IML is mainly found among large birds with precocial development, while IMC is typical of smaller species with altricial development.
Experimental evidence that egg color indicates female condition at laying in a songbird
The signaling hypothesis of eggshell coloration in birds is based on the assumption that females of species with blue-green eggs signal their phenotypic quality to their mates through deposition of
Egg colour reflects the amount of yolk maternal antibodies and fledging success in a songbird
It is shown that the intensity of blue–green colour of pied flycatcher Ficedula hypoleuca eggs reflects the amount of maternal antibodies in the yolk, a form of passive immunity crucial for offspring performance.
The results do not support the thermoregulatory hypothesis and show that certain measures of female health are related to nest-building effort in some years, probably depending on environmental conditions.
Environmental and genetic variation in the haematocrit of fledgling pied flycatchers Ficedula hypoleuca
The cross-fostering experiment indicated that almost all measured variation in haematocrit was explained by the nest where the bird was reared, not by their nest of origin, meaning that there was a very small, non-significant resemblance in the haem atocrit of genetically related sibs when reared in different environments.
"Terminal Investment" and a Sexual Conflict in the Collared Flycatcher (Ficedula albicollis)
The results strongly suggest that old collared flycatcher females increase their reproductive effort at the cost of a decreased probability of surviving to the next year, and it is suggested that this is a consequence of a conflict between the sexes over the division of work.