Share This Author
Assessing the Cost of Mounting an Immune Response
Overall, this study stresses the magnitude of costs associated with mounting immune responses and the ecological and evolutionary consequences for natural populations.
Testosterone and oxidative stress: the oxidation handicap hypothesis
- C. Alonso-Alvarez, S. Bertrand, B. Faivre, O. Chastel, G. Sorci
- Biology, MedicineProceedings of the Royal Society B: Biological…
- 22 March 2007
The hypothesis that testosterone depresses resistance to oxidative stress in a species with a testosterone-dependent sexual signal, the zebra finch, is tested and found that cell-mediated immune response was depressed in testosterone-treated birds, supporting the immunocompetence handicap hypothesis.
Stress Response and the Value of Reproduction: Are Birds Prudent Parents?
- V. Bókony, Á. Lendvai, A. Liker, F. Angelier, J. Wingfield, O. Chastel
- Biology, Environmental ScienceThe American Naturalist
- 12 March 2009
The results support the brood value hypothesis and suggest that the stress response evolves as an adaptive basis for life‐history strategies, as well as suggesting that circulating corticosterone concentrations might be matched to the anticipated demands and risks during nesting.
Patterns of aging in the long-lived wandering albatross
- V. Lecomte, G. Sorci, H. Weimerskirch
- BiologyProceedings of the National Academy of Sciences
- 22 March 2010
It is proposed that foraging efficiency (i.e., the ability of individuals to extract energy from their environment) might play a central role in shaping aging patterns in natural conditions.
Stress, prolactin and parental investment in birds: a review.
Age, experience and reproductive performance in a long-lived bird: a hormonal perspective
- F. Angelier, H. Weimerskirch, S. Dano, O. Chastel
- BiologyBehavioral Ecology and Sociobiology
- 22 January 2007
The very old and most experienced birds, which had the lowest probability of successfully fledging a young, displayed elevated corticosterone levels and low prolactin levels, possibly indicating a degradation of breeding skills and/or a disruption of the endocrine system in senescent birds.
Sexual dimorphism in steppe tortoises (Testudo horsfieldii): influence of the environment and sexual selection on body shape and mobility
Evaluating the sexual dimorphism of body proportion of more than 800 wild steppe tortoises in Uzbekistan found males were able to right themselves more quickly than females did in experimental tests, and a number of simple hypotheses can be tested on a wide range of chelonian species.
Multicolony tracking reveals the winter distribution of a pelagic seabird on an ocean basin scale
Aim An understanding of the non‐breeding distribution and ecology of migratory species is necessary for successful conservation. Many seabirds spend the non‐breeding season far from land, and…
The oxidation handicap hypothesis and the carotenoid allocation trade‐off
- C. Alonso-Alvarez, L. Pérez‐Rodríguez, R. Mateo, O. Chastel, J. Viñuela
- BiologyJournal of evolutionary biology
- 1 November 2008
Testosterone‐treated males maintained the highest circulating carotenoid levels, but showed the palest red traits and no evidence of oxidative damage, suggesting that the trade‐off was apparently solved by reducing redness, allowing increased carotENoid availability, which could have contributed to buffer oxidative stress.
Effects of warm sea–surface temperature anomalies on the blue petrel at the Kerguelen Islands
- C. Guinet, O. Chastel, M. Koudil, J. Durbec, P. Jouventin
- Environmental ScienceProceedings of the Royal Society of London…
- 7 June 1998
Several long–term studies on Southern Ocean seabirds and seals have suggested a possible link between major declines in breeding performance and El Niño Southern Oscillation events. We report that…