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Reproduction and modulation of the stress response: an experimental test in the house sparrow
TLDR
The hypothesis that individuals flexibly modulate their stress response with respect to the reproductive value of their brood in free-living house sparrows is tested and it is found that parents tending enlarged clutches responded less strongly to a stressor than those tending reduced clutches.
Parasites in the City: Degree of Urbanization Predicts Poxvirus and Coccidian Infections in House Finches (Haemorhous mexicanus)
TLDR
The results indicate that the physical presence of humans in cities and the associated altered urban landscape characteristics are associated with increased infections with both a virus and a gastrointestinal parasite in this common songbird resident of North American cities.
Effects of access to preen gland secretions on mallard plumage
TLDR
It is shown that preen oil acts to maintain plumage condition and suggests that feather microstructure is essential to maintain feathers waterproofness, and shows that plumage waterproofness is mostly due to the spatial micro-structure of feathers.
A review of urban impacts on avian life‐history evolution: Does city living lead to slower pace of life?
TLDR
According to the hypothesis, differences in age structure should arise between urban and rural populations, providing a novel alternative explanation for physiological differences and earlier breeding.
Carotenoid-based plumage coloration reflects feather corticosterone levels in male house finches (Haemorhous mexicanus)
TLDR
The results suggest that CORT should not be considered as a simple indicator of individual quality but rather as a mediator of complex allocation decisions or signals of metabolic activity that could link up with more elaborate expression of ornamental traits.
Effects of carotenoid supplementation and oxidative challenges on physiological parameters and carotenoid-based coloration in an urbanization context
TLDR
Overall, the results fail to reveal key carotenoid-specific physiological differences in urban and desert finches, and instead implicate other ecophysiological factors that drive urban/desert differences in carOTenoid ornamentation.
Within-individual plasticity explains age-related decrease in stress response in a short-lived bird
TLDR
It is suggested that stress responsiveness is a plastic trait that may vary within individuals in an adaptive manner, and natural selection may act on the reaction norms producing optimal phenotypic response in the actual environment and life-history stage.
Preen gland removal increases plumage bacterial load but not that of feather-degrading bacteria
TLDR
It is found that preen gland removal led to higher loads of OCB, which suggests that the antimicrobial spectrum of the preen oil is broader than previously thought and that, by reducing the overall feather bacterial loads, thePreen gland could help birds to protect themselves against a variety of potentially harmful bacteria.
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