FIG. 2.

Enterobacterial prevalence on yellow-legged gull chicks according to refuse consumption on the Iberian Mediterranean coast. The numbers of birds positive for Salmonella spp. (a), Salmonella enterica subsp. enterica serovar Typhimurium (b), Campylobacter spp. (c), and Campylobacter jejuni (d) are shown in black according to refuse consumption. The numbers of gulls negative for enterobacteria are shown in white. x axis categories represent the quintiles (n = 182; none = 38, low = 35, medium = 36, high = 37, very high = 36) according to the individual refuse consumption percentages estimated from isotopic mixing models.