..., if they did so, they would pay greater production costs than high-quality individuals. We tested an alternative explanation for the black bib size of male house sparrows, Passer domesticus , an honest signal of quality the expression of which is negatively related to levels of the pigment pheomelanin...

... content, it is unclear whether observed effects reflected lack of induction by the low carbohydrate levels or suppression by the high lipid levels. Here, we isolated the specific effects of dietary carbohydrate and lipid on carbohydrases. We hand-fed house sparrow nestlings on diets with 25% starch and 8...

...-allocation hypothesis). Here in wild-caught house sparrows ( Passer domesticus ), we tested the second hypothesis, asking whether sustained elevation of baseline glucocorticoids, due to captivity, caused a greater rate of decline in immune functions than flight performance. A greater decline in immune...

... (irreversible developmental plasticity) in digestive physiology caused by the neonatal diet may form such a mechanism. We previously showed that the lack of starch in the diet of house sparrow ( Passer domesticus ) nestlings between 3 and 12 days post-hatching significantly decreased the activity of intestinal...

... in auditory processing of the house sparrow ( Passer domesticus L.) using auditory brainstem responses (ABRs) to tone bursts. We measured amplitude and latency of the first ABR peak in spring, summer and autumn at stimulus frequencies from 0.8 to 6.4 kHz and intensity levels from 24 to 80 dB SPL. ABR...

...Paweł Brzęk; Kevin Kohl; Enrique Caviedes-Vidal; William H. Karasov SUMMARY House sparrow nestlings are fed primarily on insects during the first 3 days of their life, and seeds become gradually more important afterwards. We tested whether developmental changes in size and functional capacity...

... serves as a barrier to water vapor diffusion through the skin. We measured cutaneous water loss (CWL) in two populations of house sparrow Passer domesticus L., one living in a desert environment in Saudi Arabia, and another living in a mesic environment in Ohio, USA. We found that CWL rates at 30°C were...

... that is absorbed only passively and is not catabolized, and of 3- O -methyl- d -glucose(3OM d -glucose), the d -glucose analogue that is actively and passively transported and not catabolized. In house sparrows Passer domesticus , we applied a pharmacokinetic method to measure simultaneous in vivo absorption...

... reflects the health and condition of individuals and is used in mate selection. The information contained in melanin-based and structurally based ornamental colors in birds is less well resolved, however. We subjected male house sparrows Passer domesticus and brown-headed cowbirds Molothrus ater...

...Giovanni Casotti ABSTRACT Seasonal variability in kidney morphology of the house sparrow Passer domesticus was examined using light microscopy. Sparrows were captured from the wild in winter, spring, summer and autumn. The kidneys were perfused with half-strength Karnovsky’s fixative and processed...

...Mark A. Chappell; Claus Bech; William A. Buttemer ABSTRACT We evaluated the relationship between organ mass and the limits to aerobic metabolism in house sparrows Passer domesticus . The results were used to test three models of performance limitation (the central limitation, peripheral limitation...