Reproduction and modulation of the stress response: an experimental test in the house sparrow

The stress response is highly variable among individuals, but the causes of this variation remain largely unknown. In response to stressors, vertebrates secrete elevated levels of glucocorticoids which enhance survival, but concurrently interfere with reproduction. We tested the hypothesis that indi...

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Bibliographic Details
Published in:Proceedings of the Royal Society of London 2007-02, Vol.274 (1608), p.391-397
Main Authors: Lendvai, Ádám Zoltán, Giraudeau, Mathieu, Chastel, Olivier
Format: Article
Language:English
Subjects:
Analysis of Variance
Animal reproduction
Animals
Aviculture
Biodiversity and Ecology
Bird nesting
Bird songs
Body condition
Breeding
Breeding seasons
Brood Size Manipulation
Clutch Size - physiology
Corticosterone
Corticosterone - metabolism
Environment and Society
Environmental Sciences
Life History
Parental Care
Passer domesticus
Reproduction - physiology
Sparrows
Sparrows - physiology
Stress response
Stress, Physiological - metabolism
Stress-Response Modulation
Time Factors
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Summary:The stress response is highly variable among individuals, but the causes of this variation remain largely unknown. In response to stressors, vertebrates secrete elevated levels of glucocorticoids which enhance survival, but concurrently interfere with reproduction. We tested the hypothesis that individuals flexibly modulate their stress response with respect to the reproductive value of their brood in free-living house sparrows (Passer domesticus). We experimentally increased or decreased clutch size during the nestling period and found that parents tending enlarged clutches responded less strongly to a stressor than those tending reduced clutches. In addition, we examined whether individuals responded less strongly to a stressor as the breeding season progressed and future reproductive opportunities declined. We found that the stress response decreased with breeding date during the birds' first breeding attempt, but it remained constant during their second breeding attempt. Within-individual variability in the stress response was related to the brood size manipulations the birds received in their two consecutive breeding attempts. These results provide the first experimental support for the hypothesis that individuals actively modulate their stress response with respect to the value of current reproduction.
ISSN:0962-8452
0370-1662
1471-2954
2053-9126
DOI:10.1098/rspb.2006.3735