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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
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.
Egg colouration and male parental effort in the pied flycatcher Ficedula hypoleuca
This evidence is only tentative until experimental confirmation, but suggests that males are affected by the colour of their mates’ eggs, a possibility not considered hitherto in the study of sexual selection.
Evidence for the signaling function of egg color in the pied flycatcher Ficedula hypoleuca
The signaling hypothesis for explaining bright colors of avian eggs is supported, as mean within-clutch egg darkness was positively associated with both measures of female immunocompetence and better female condition was associated with colors tending away from intermediate and toward short wavelengths.
Nestling cell-mediated immune response, body mass and hatching date as predictors of local recruitment in the pied flycatcher Ficedula hypoleuca
Nestling immunocompetence as measured with the PHA assay is a better predictor of local recruitment probability than mass or hatching date in the study population, and should be considered in future studies of determinants of offspring survival chances and fitness in avian populations.
Female ornaments in the Pied Flycatcher Ficedula hypoleuca : associations with age, health and reproductive success
This work addressed the associations of these two ornaments with female age and with some health and breeding parameters in a Spanish population of Pied Flycatchers, finding that the white forehead patch characteristic of males and the larger wing patches may indicate some aspects of female quality.
Sex recognition by odour and variation in the uropygial gland secretion in starlings.
This study reveals for first time that a passerine species can discriminate the sex of conspecifics by relying on chemical cues and suggests that the uropygial gland secretion may potentially function as a chemical signal used in mate choice and/or intrasexual competition in this species.
Are eggshell spottiness and colour indicators of health and condition in blue tits Cyanistes caeruleus
Clear evidence of eggshell spottiness and general colour as indicators of general condition and stress in avian populations is presented for the first time.
A trade-off between two resource-demanding functions: post-nuptial moult and immunity during reproduction in male pied flycatchers
The results suggest that experimental activation of the males’ immune system decreased the resources necessary for initiating post-nuptial moult, suggesting the trade-off between immunity and moult onset may imply costs of delayed moult in cases of infection and may interact with reproductive immunosuppression in Cases of moult–breeding overlap.