Feeding ecology of yellow-legged gulls Larus michahellis in the western Mediterranean: a comparative assessment using conventional and isotopic methods

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Annual and seasonal consistency in the feeding ecology of an opportunistic species, the yellow-legged gull Larus michahellis (2014, methodology): “This increase has been mainly attributed to the ability of gulls to adapt to human-altered environments by opportunistically exploiting both terrestrial (e.g. refuse dumps) and marine (e.g. fishery discards) resources (Moreno et al. 2009, Ramos et al. 2009a).”
Age and sexual differences in the exploitation of two anthropogenic food resources for an opportunistic seabird (2010, background): “2009) or the use of marine or terrestrial food (Ramos et al. 2009).”
A three-isotope approach to disentangling the diet of a generalist consumer: the yellow-legged gull in northwest Spain (2010, methodology): “Although isotopic mixing models are very helpful in providing quantitative indices of food item contributions to a consumer’s diet (Caut et al. 2008; Ramos et al. 2009a), they require prior conventional diet analysis in order to correctly select potential preys.”
Seasonal changes in the diet of a critically endangered seabird and the importance of trawling discards (2009, background): “Boxes represent the range of expected values in the consumer, considering 99% CI for prey and accounting for diet-blood isotopic fractionation factors of 1.7‰ for 15N and 0.9‰ for 13C (following Ramos et al. 2009).”