Bost C. A. auteur aut IRD Cotte C. auteur aut IRD Terray Pascal auteur aut IRD Barbraud C. auteur aut IRD Bon C. auteur aut IRD Delord K. auteur aut IRD Gimenez O. auteur aut IRD Handrich Y. auteur aut IRD Naito Y. auteur aut IRD Guinet C. auteur aut IRD Weimerskirch H. auteur aut IRD text journalArticle eng text/pdf reformatted digital access Determining the links between the behavioural and population responses of wild species to environmental variations is critical for understanding the impact of climate variability on ecosystems. Using long-term data sets, we show how large-scale climatic anomalies in the Southern Hemisphere affect the foraging behaviour and population dynamics of a key marine predator, the king penguin. When large-scale subtropical dipole events occur simultaneously in both subtropical Southern Indian and Atlantic Oceans, they generate tropical anomalies that shift the foraging zone southward. Consequently the distances that penguins foraged from the colony and their feeding depths increased and the population size decreased. This represents an example of a robust and fast impact of large-scale climatic anomalies affecting a marine predator through changes in its at-sea behaviour and demography, despite lack of information on prey availability. Our results highlight a possible behavioural mechanism through which climate variability may affect population processes. specialized OCEAN INDIEN ATLANTIQUE OCEAN AUSTRAL 036 032 021 6 art. 8220 [9 p.] 2015 2041-1723 https://www.documentation.ird.fr/hor/fdi:010065460 10.1038/ncomms9220 2041-1723 [F B010065460] https://www.documentation.ird.fr/hor/fdi:010065460 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers17-10/010065460.pdf IRD - Base Horizon / Pleins textes 2016-01-14 2017-10-31 fdi:010065460 fre