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Stressed mothers lay eggs with high corticosterone levels which produce low-quality offspring.
TLDR
Maternal stress impaired offspring phenotype and viability by increasing transmission of glucocorticosteroids to the eggs, and a novel mechanism mediating early maternal effects whereby maternal stress affects offspring quality is identified.
Habitat structure and the evolution of bird song: a meta-analysis of the evidence for the acoustic adaptation hypothesis
TLDR
The meta-analysis supports the acoustic adaptation hypothesis, but habitat structure only weakly predicts the acoustical properties of bird songs, and other potentially relevant factors should be included in realistic models of the evolution of bird song acoustics.
Immunocompetence, ornamentation, and viability of male barn swallows (Hirundo rustica).
TLDR
The results of this study are the first to demonstrate that immunocompetence can predict long-term survival in a free-ranging vertebrate and are compatible with current models of parasite-mediated sexual selection.
Immunocompetence of nestling barn swallows in relation to brood size and parental effort
TLDR
It is concluded that T-lymphocyte cell-mediated immune response as well as body mass is influenced by the level of parental investment and brood size, perhaps via its effect on competition for food.
Challenging claims in the study of migratory birds and climate change
TLDR
A proper integration across biological disciplines seems essential for the field's transition from affirming patterns to understanding mechanisms and making robust predictions regarding future consequences of shifting phenologies.
Effects of elevated egg corticosterone levels on behavior, growth, and immunity of yellow-legged gull (Larus michahellis) chicks
TLDR
It is suggested that egg corticosterone can affect the behavior and immunity of offspring in birds and disclose a mechanism mediating early maternal effects whereby stress experienced by females may negatively translate to offspring phenotypic quality.
AN EXPERIMENTAL STUDY OF PATERNITY AND TAIL ORNAMENTATION IN THE BARN SWALLOW (HIRUNDO RUSTICA)
TLDR
There is a causal, positive relationship between male tail length and paternity and this study shows that female choice is a component of selection for larger male ornaments.
Better red than dead: carotenoid-based mouth coloration reveals infection in barn swallow nestlings
TLDR
It is demonstrated that the gape colour of nestlings challenged with a novel antigen and provided with the principal circulating carotenoid (lutein) have more brightly coloured red gapes than their challenged but unsupplemented siblings and this suggests that parents may favour nestlings with superior health by preferentially feeding offspring with the brightest gapes.
Song correlates with social context, testosterone and body condition in male barn swallows
TLDR
Relationships between song structure and social context suggest that some features, such as the rattle, might have originally evolved to serve in male-male interactions; a female preference may have further promoted song evolution leading to complex syllable repertoires.
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