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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. Expand
Haematozoa in forest birds from southern Chile: Latitudinal gradients in prevalence and parasite lineage richness
Geo- graphical gradients in prevalence of avian haematozoa differ between parasite genera and hemispheres, probably in relation to the existence of appropriate vector-parasite-host interactions. Expand
Immune Defense and Host Sociality: A Comparative Study of Swallows and Martins
It is shown that the impact of parasites on host reproductive success was positively associated with the degree of sociality in the bird family Hirundinidae, however, the cost of parasitism in highly colonial species was countered by high levels of T‐ and B‐cell immune responses. Expand
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 ofExpand
New data on epizootiology and genetics of piroplasms based on sequences of small ribosomal subunit and cytochrome b genes.
These new findings confirm the ability of some piroplasms to infect multiple hosts, as well as the existence of a relatively wide genetic polymorphisms with respect to the cytochrome b gene. Expand
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. Expand
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. Expand
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. Expand
Heterophil/lymphocyte ratios and heat-shock protein levels are related to growth in nestling birds
Abstract Growing altricial birds may experience nutritional stress in the nest due to sibling competition, food restriction, or parasites. Nutritional stress may be detected through its effect onExpand
Reproductive effort affects immune response and parasite infection in a lizard : a phenotypic manipulation using testosterone
The results suggest that higher investment in reproduction decreases the immune defences, and conduces to the use of structural resources, which may render individuals more susceptible to some haemoparasites. Expand