AVOCETTA - VOLUME 18 - N. 2
Dependence of Yellow-Iegged Gulls (Larus cachinnans) on food from human activity in two Western Mediterranean coloniesBOSCHI M., ORO D. and RUIZ X.
Abstract:The diet of tledging chicks of the Yellow-Iegged Gull (Larus cachinnans) was studied in the Medes Islands and the Ebro Delta, two Northwestern Mediterranean colonies with differing ecological characteristics. The diet ofthe Medes Islands colony showed a higher biomass percentage oftip food than from the Ebro Delta colony. At the Ebro Delta, chicks consumed a higher biomass percentage ofpreys from channel s, mainly mullets (Mugil sp.) and showed a higher foraging niche width. The consumption of garbage from refuse tips seems to affect the growth patterns in both populations.