Influence of sea-ice-related features and anthropogenic subsidies on the foraging behaviour of a high-Arctic seabird, the ivory gull (Pagophila eburnea) | Influence des caractéristiques de a glace de mer et des ressources d'origines anthropiques sur le comportement de recherche de nourriture d'un oiseau marin du haut-Arctique, la mouette ivoire (Pagophila eburnea).
2022
Dumas, Keyvan | Gilg, Olivier | Courbin, Nicolas | Corregidor-Castro, Alejandro | Evanno, Guillaume | Strøm, Hallvard | Mosbech, Anders | Frederiksen, Morten | Yannic, Glenn | Laboratoire d'Ecologie Alpine (LECA) ; Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (Fédération OSUG)-Université Grenoble Alpes (UGA) | Laboratoire Chrono-environnement (UMR 6249) (LCE) ; Centre National de la Recherche Scientifique (CNRS)-Université de Franche-Comté (UFC) ; Université Bourgogne Franche-Comté [COMUE] (UBFC)-Université Bourgogne Franche-Comté [COMUE] (UBFC) | Groupe de recherche en écologie arctique (GREA) | Aarhus University [Aarhus] | Dynamique et durabilité des écosystèmes : de la source à l’océan (DECOD) ; Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro)-Institut Agro Rennes Angers ; Institut national d'enseignement supérieur pour l'agriculture, l'alimentation et l'environnement (Institut Agro) | Norwegian Polar Institute | MF was supported by the North-East Greenland Environmental Study Program, financed by the Greenland Government, and GY was supported by the French Polar Institute-IPEV [Program “Ivory1210”].
International audience
Show more [+] Less [-]English. The Arctic region is currently experiencing major modifications in sea ice extent and phenology due to global climate and anthropogenic changes. As Arctic marine ecosystems rely greatly on the presence of sea ice and its seasonal dynamics, these changes could have major impacts on Arctic biota. The ivory gull (Pagophila eburnea) is an endemic Arctic seabird whose populations are declining in Canada and Svalbard. Its affinity for sea ice makes it a good sentinel species of current changes in the high Arctic. We explored the influence of sea-ice-related features and anthropogenic subsidies on the foraging behaviour of ivory gulls during the breeding season. To this end, we analysed the movement of adult ivory gulls in north-east Greenland. We confirmed that ivory gulls use a dual foraging strategy, with birds faithful to their foraging areas at short distances from the colony, but used individual-specific areas during long-distance foraging trips. We highlight that ivory gulls are spatially specialised individuals within a generalist species. We demonstrated that human settlements attracted foraging birds, which shows that human presence in such a remote place may influence seabird behaviour. Finally, by combining hidden Markov models and resourceselection functions, we showed that ivory gulls selected highly concentrated sea ice for foraging during the breeding season. Our study provides key information on the use of space and foraging strategies of ivory gulls during the breeding season, and more broadly, how Arctic seabirds use ice features.
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