Abstract
Because glucocorticoid (stress) hormones fundamentally affect various aspects of the behaviour, life history and fitness of free-living vertebrates, there is a need to understand the environmental factors shaping their variation in natural populations. Here, we examined whether spatial heterogeneity in breeding territory quality affected the stress of colonial king penguin (Aptenodytes patagonicus). We assessed the effects of local climate (wind, sun and ambient temperature) and social conditions (number of neighbours, distance to neighbours) on the baseline levels of plasma total corticosterone (CORT) in 77 incubating and 42 chick-brooding birds, breeding on territories of central or peripheral colony location. We also assessed the oxidative stress status of a sub-sample of central vs. peripheral chick-brooders to determine whether chronic stress arose from breeding on specific territories. On average, we found that brooders had 55 % higher CORT levels than incubators. Regardless of breeding status, central birds experienced greater social density (higher number of neighbours, shorter distance between territories) and had higher CORT levels than peripheral birds. Increasing social density positively explained 40 % of the variation in CORT levels of both incubators and brooders, but the effect was more pronounced in brooders. In contrast, climate was similar among breeding territories and did not significantly affect the CORT levels of breeding birds. In brooders, oxidative stress status was not affected by local density or weather conditions. These results highlight that local heterogeneity in breeding (including social) conditions may strongly affect the stress levels of breeding seabirds. The fitness consequences of such variation remain to be investigated.
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Acknowledgments
We are sincerely grateful to R. Boonstra and C. Saraux for enlightened comments on a previous draft of the paper. Three anonymous reviewers provided insightful comments on the manuscript. We wish to thank M. Kauffmann and C. Zimmer for their help during fieldwork, and P. Ohlmann for providing facilities for CORT measurements. This research was funded by the French Polar Institute (IPEV-Research Program 119) and the National Center for Scientific Research (CNRS-INEE). Logistic support in the field was provided by the Terres Australes et Antarctiques Françaises. V. A. V. was the recipient of a post-doctoral fellowship from the AXA foundation.
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Communicated by Pawel Koteja.
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Viblanc, V.A., Gineste, B., Stier, A. et al. Stress hormones in relation to breeding status and territory location in colonial king penguin: a role for social density?. Oecologia 175, 763–772 (2014). https://doi.org/10.1007/s00442-014-2942-6
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DOI: https://doi.org/10.1007/s00442-014-2942-6