Abstract
As predicted by life history theory, once recruited into the breeding population and with increasing age, long-lived animals should be able to manage more efficiently the conflict between self-maintenance and reproduction. Consequently, breeding performances should improve with age before stabilizing at a certain level. Using temperature–depth recorders and isotopic analysis, we tested how age affects the foraging behaviour of king penguin Aptenodytes patagonicus during one trip in the chick-rearing phase. Depending on sex and age, king penguins expressed two different foraging strategies. Older birds gained more daily mass per unit body mass than younger ones. Older females conducted shorter trips, dived deeper and performed more prey pursuits. They also had higher blood levels of δ15N than younger individuals and males indicating sex- and age-specific dietary regimes. However, we found no differences in carbon isotopic signature, suggesting that individuals exploited the same foraging areas independently of sex and age. Our results suggest that king penguins are able to increase the quantity of energy extracted with increasing age and that such a strategy is sex-related. Our study is the first to reveal of an interaction between age and sex in determining foraging efficiency in king penguins.
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Acknowledgments
Thanks to Paul E. Viblanc for his help in pre-analysing diving data. We are grateful to B. Friess for his help on the Radio Frequency IDentification analysis and H. Gachot-Neveu for sexing birds. Thanks to T. Raclot for his help in delipidating samples, to J.-P. Robin for lyophylizing samples and to P. Richard and G. Guillou for isotopic measurements. We thank all volunteers for their help with field work. This work was supported by the Institut Polaire Français Paul-Emile Victor (Program ECOPHY 137), and by the grants from the Centre National de la Recherche Scientifique, the Fondation Prince Albert II de Monaco (http://www.fpa2.com) and the Fondation des Treilles (to M.L.V.), and the Marie Curie Intra European Fellowship (FP7-PEOPLE-IEF-2008, European Commission; project No 235962) (to C.L.B.).
Ethical note
All procedures employed during animal handling, PIT-tag implantations and data-logger deployments were approved by the Ethical Committee of the French Polar Institute (IPEV Program ECOPHY 137: permits 01/315/AUT issued on the 4 July 2001, 01/322/AUT issued on the 16 August 2001, 2005-191 issued on the 21 November, 2009-57 issued on the 26 August, and 2009-59 issued on the August 29). The handling of individuals was performed without anaesthetic and lasted no longer than 15 min.
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Communicated by S. Garthe.
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Le Vaillant, M., Le Bohec, C., Prud’Homme, O. et al. How age and sex drive the foraging behaviour in the king penguin. Mar Biol 160, 1147–1156 (2013). https://doi.org/10.1007/s00227-013-2167-y
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DOI: https://doi.org/10.1007/s00227-013-2167-y