Mendez L. auteur aut IRD Borsa Philippe auteur aut IRD Cruz S. auteur aut IRD de Grissac S. auteur aut IRD Hennicke J. auteur aut IRD Lallemand J. auteur aut IRD Prudor A. auteur aut IRD Weimerskirch H. auteur aut IRD text journalArticle eng text/pdf born digital access While interspecific differences in foraging behaviour have attracted much attention, less is known about how foraging behaviour differs between populations of the same species. Here we compared the foraging strategy of a pantropical seabird, the red-footed booby Sula sula, in 5 populations breeding in contrasted environmental conditions. The foraging strategy strongly differed between sites, from strictly diurnal short trips in Europa Island (Mozambique channel) to long trips including up to 5 nights at sea in Genovesa Island (Galapagos archipelago). The Expectation Maximisation binary Clustering (EMbC) algorithm was used to determine the different behaviours of individuals during their foraging trips (travelling, intensive foraging, resting and relocating). During the day, the activity budget was similar for all the breeding colonies. During the night, birds were primarily on the water, drifting with currents. At all sites, birds similarly performed intensive foraging in zones of area-restricted search (ARS), although the size and duration of ARS zones differed markedly. Red-footed boobies foraged over deep oceanic waters, with chlorophyll a concentrations varying between sites. Birds did not appear to target areas with higher productivity. We suggest that range differences between populations may be linked to other factors such as intra-and interspecific competition. specialized Sula sula Tropical GPS tracking Area-restricted search ARS Chlorophyll a Expectation Maximisation binary Clustering EMbC OCEAN INDIEN PACIFIQUE NOUVELLE CALEDONIE CHESTERFIELD 036 034 080 568 217-230 2017 0171-8630 https://www.documentation.ird.fr/hor/PAR00016085 10.3354/meps12052 0171-8630 [F B010069493] https://www.documentation.ird.fr/hor/PAR00016085 https://www.documentation.ird.fr/intranet/publi/2017/05/010069493.pdf Accès réservé (Intranet de l'IRD) IRD - Base Horizon / Pleins textes 2017-06-01 2023-07-11 PAR00016085 fre