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Immunocompetence and condition-dependent sexual advertisement in male house sparrows (Passer domesticus)
TLDR
The results support the view that immune defences are important for survival and parasite resistance in natural populations, and that they might becostly to produce, and do not support the condition-dependent hypothesis of sexual advertisement.
Extrapair paternity in relation to sexual ornamentation, arrival date, and condition in a migratory bird
TLDR
The novel hypothesis that arrival date in migratory birds represents a reliable indicator of male quality that can be used by females as a cue in extrapair mating decisions is tested and suggests that extrapair paternity depends on the effects of condition, through its indirect effects on arrival date, tail length, and other variables.
Immunocompetence and nestling survival in the house martin : the tasty chick hypothesis
TLDR
It is suggested that ectoparasites may be a key factor in the evolution and the maintenance of the establishment of weight hierarchies within broods and predicted that immunocompetence was positively correlated with body condition, and that nestlings dying before fledging should have lower immune responses when challenged with an antigen.
Dynamics of an immune response in house sparrows Passer domesticus in relation to time of day, body condition and blood parasite infection
TLDR
This work investigated the temporal dynamics of the T-cell mediated response to a challenge of the immune system with phytohemag-glutinin in house sparrows in relation to time of day, body condition and blood parasite infection.
Nest building is a sexually selected behaviour in the barn swallow
TLDR
The hypothesis that nest building is a sexually selected trait is tested and it is predicted that females paired with males of high parental quality may obtain a mate providing large amounts of parental investment, while, as has been shown previously, females mated to attractive males will acquire mates with good genetic quality.
Malarial parasites decrease reproductive success: an experimental study in a passerine bird
TLDR
It is demonstrated that malarial parasites can have dramatic effects on clutch size and other demographic variables, potentially influencing the evolution of clutch size, but also the population dynamics of heavily infected populations of birds.
Testosterone and sexual signalling in male house sparrows (Passer domesticus)
TLDR
The result suggests that testosterone can be causally involved in the expression of a secondary sexual trait in house sparrows, at least in terms of its seasonal exposure.
Antioxidants and condition‐dependence of arrival date in a migratory passerine
TLDR
It is found that male tail length, the main secondary sexual character, body condition, and hematocrit were negatively correlated with arrival date in the first year, indicating better quality of early arriving males, and Arrival date is a condition-dependent character in barn swallows.
Genetic and environmental components of phenotypic variation in immune response and body size of a colonial bird, Delichon urbica (the house martin)
TLDR
Highly social bird species such as the house martin, which are subject to intense selection by parasites, have a limited scope for immediate microevolutionary response to selection because of low heritabilities, but also alimited scope for long-term response to Selection because evolvability as indicated by small additive genetic coefficients of variation is weak.
Sexual selection and tail streamers in the barn swallow
TLDR
Experimental manipulation of the length of the outermost tail feathers has demonstrated sexual selection advantages of tail elongation and disadvantages of tail shortening, with opposite effects for natural selection in terms of foraging efficiency, haematocrit and survival.
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