La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

Titre :	Diet and foraging range of Slender-billed Gulls Chroicocephalus genei breeding in the Saloum Delta, Senegal (2019)
Auteurs :	Jan Veen, Auteur ; Hanneke Dallmeijer, Auteur ; Almut E. Schlaich, Auteur ; Thor Veen, Auteur ; Wim C. Mullié, Auteur
Type de document :	Article
Dans :	Ardea (107(1) April, 2019)
Article en page(s) :	33-46
Résumé :	West African Slender-billed Gulls Chroicocephalus genei are considered vulnerable due to a very restricted breeding range. However, little information on their ecology is available to support conservation action. We describe diet and foraging range of Slender-billed Gulls breeding in the Saloum Delta National Park in Senegal. Diet was analysed on the basis of fish otoliths in excretion (mixture of pellets and faeces) collected near nests at the end of the incubation period between 2000 and 2015. Gulls mainly consumed fish of the families Cichlidae (25-93%), Clupeidae (0-54%) and Mugilidae (0-34%). The log-ratio proportion of Mugilidae increased significantly between 2000 and 2015, but there was no significant trend for other prey taxa. In 2014, UvA-BITS GPS-trackers were fitted to three Slender-billed Gulls to study movement and foraging range. During daytime, these gulls spent 27% of their time incubating the eggs, 10% elsewhere in the colony and 63% outside the colony on foraging trips. Foraging trips lasted on average

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