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Assessing the Cost of Mounting an Immune Response
The evolution of parasite resistance has often been assumed to be governed by antagonistic selection pressures. Defense against pathogens, by mounting an immune response, confers evident benefits butExpand
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Testosterone and oxidative stress: the oxidation handicap hypothesis
Secondary sexual traits (SST) are usually thought to have evolved as honest signals of individual quality during mate choice. Honesty of SST is guaranteed by the cost of producing/maintaining them.Expand
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Stress Response and the Value of Reproduction: Are Birds Prudent Parents?
In vertebrates, stressors such as starvation or predator attacks stimulate the rapid elevation of circulating glucocorticoid hormones, triggering physiological and behavioral responses that aidExpand
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The oxidation handicap hypothesis and the carotenoid allocation trade‐off
The oxidation handicap hypothesis proposes that testosterone mediates the trade‐off between the expression of secondary sexual traits and the fight against free radicals. Coloured traits controlledExpand
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Patterns of aging in the long-lived wandering albatross
How does an animal age in natural conditions? Given the multifaceted nature of senescence, identifying the effects of age on physiology and behavior remains challenging. We investigated the effectsExpand
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Stress, prolactin and parental investment in birds: a review.
In this paper, we review the relationships that link avian parental behavior, stress (acute or chronic) and energetic constraints to the secretion of prolactin, the 'parental hormone'. ProlactinExpand
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Age, experience and reproductive performance in a long-lived bird: a hormonal perspective
The ultimate factors influencing age-specific reproductive performance in birds have been widely discussed, and several hypotheses have been suggested to explain why young/inexperienced breeders haveExpand
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Sexual dimorphism in steppe tortoises (Testudo horsfieldii): influence of the environment and sexual selection on body shape and mobility
Abstract Selective forces shape sexes differently, with male body proportions facing strong selection to enhance mate searching and male-to-male combat traits, and female fitness being influenced byExpand
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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, andExpand
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How does corticosterone affect parental behaviour and reproductive success? A study of prolactin in black-legged kittiwakes
Summary 1. An emergency life-history stage is expressed in breeding vertebrates when the immediate survival is threatened by poor energetic conditions (i.e. allostatic overload). This emergencyExpand
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