Assessing the impact of urban landfills as feeding sites on physiological parameters of a generalist seabird species

The increasing human population and associated urban waste pose a significant threat to wildlife. Our study focused on the Kelp gull (Larus dominicanus), known for opportunistic feeding in anthropogenic areas, particularly urban landfills. We assessed the physiological status of Kelp gulls at a landfill and compared it with gulls from a protected natural site. Results indicate that gulls from the anthropogenic site exhibited lower levels of key physiological parameters linked to diet, including triglycerides, total proteins, uric acid, plasmatic enzyme activity, body condition index, and leukocyte count, in comparison to their counterparts from the natural site. These findings suggest that Kelp gulls experience inferior physical and nutritional conditions when utilizing anthropogenic sites like landfills governmentally managed. •Physiological indicators on the health of Kelp gulls using an urban landfill as a feeding site•Gulls from the anthropogenic site had lower values of nutritional parameters and leukocyte counts.•Kelp gulls using urban landfills may experience weaker nutritional conditions.