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We studied 4 natural and 2 urban yellow-legged gull <jats:italic>Larus michahellis<\/jats:italic> colonies and compared (1) diet composition (through pellet analysis) and (2) isotopic niches of adults and chicks, (3) diet delivered to chicks of different ages, and (4) fatty acid (FA) composition of fledglings, in order to assess diet composition, diversity and quality, and the relevance of marine prey for natural and urban gull populations. Adult urban gulls consumed considerably lower proportions of marine prey when compared to gulls from natural colonies; however, they fed their younger chicks (&lt;20 d old) mostly with fish, representing 61-80% of their chick food deliveries. Refuse items were mostly delivered to chicks older than 20 d. Overall, urban isotopic niches were not completely distinct from those of natural colonies, in some cases sharing ca. 50% of their niche space. Fledglings from the most urbanized colony presented overall higher FA concentrations and diversity, but they were lacking some omega-3 FAs relevant to their physiology. Our results highlight the importance of marine resources in the diet of urban gulls, particularly during early chick rearing, the relevance of food sources in the area around the breeding colonies and the fact that urban gulls benefit from year-round reliable anthropogenic food resources.<\/jats:p>","DOI":"10.3354\/meps13599","type":"journal-article","created":{"date-parts":[[2020,12,8]],"date-time":"2020-12-08T10:19:46Z","timestamp":1607422786000},"page":"189-201","update-policy":"https:\/\/doi.org\/10.3354\/policy","source":"Crossref","is-referenced-by-count":33,"title":["The importance of marine resources in the diet of urban gulls"],"prefix":"10.3354","volume":"660","author":[{"given":"J","family":"Pais de Faria","sequence":"first","affiliation":[{"name":"University of Coimbra, MARE - Marine and Environmental Sciences Centre, Department of Life Sciences, Cal\u00e7ada Martim de Freitas, 3000-456 Coimbra, Portugal"}]},{"given":"PT","family":"Vaz","sequence":"additional","affiliation":[{"name":"University of Coimbra, MARE - Marine and Environmental Sciences Centre, Department of Life Sciences, Cal\u00e7ada Martim de Freitas, 3000-456 Coimbra, Portugal"}]},{"given":"CS","family":"Lopes","sequence":"additional","affiliation":[{"name":"University of Coimbra, MARE - Marine and Environmental Sciences Centre, Department of Life Sciences, Cal\u00e7ada Martim de Freitas, 3000-456 Coimbra, Portugal"}]},{"given":"JG","family":"Calado","sequence":"additional","affiliation":[{"name":"University of Coimbra, MARE - Marine and Environmental Sciences Centre, Department of Life Sciences, Cal\u00e7ada Martim de Freitas, 3000-456 Coimbra, Portugal"},{"name":"Molecular and Environmental Biology Centre (CBMA), Universidade do Minho Campus de Gualtar, 4710-057 Braga, Portugal"},{"name":"Animal Ecology Group, Universidade de Vigo, Lab 97, Torre CACTI, Campus As Lagoas, 36310 Vigo, Spain"}]},{"given":"JM","family":"Pereira","sequence":"additional","affiliation":[{"name":"University of Coimbra, MARE - Marine and Environmental Sciences Centre, Department of Life Sciences, Cal\u00e7ada Martim de Freitas, 3000-456 Coimbra, Portugal"},{"name":"Environment and Sustainability Institute, University of Exeter, Penryn Campus, Penryn TR10 9FE, UK"}]},{"given":"SN","family":"Ver\u00edssimo","sequence":"additional","affiliation":[{"name":"University of Coimbra, MARE - Marine and Environmental Sciences Centre, Department of Life Sciences, Cal\u00e7ada Martim de Freitas, 3000-456 Coimbra, Portugal"}]},{"given":"VH","family":"Paiva","sequence":"additional","affiliation":[{"name":"University of Coimbra, MARE - Marine and Environmental Sciences Centre, Department of Life Sciences, Cal\u00e7ada Martim de Freitas, 3000-456 Coimbra, Portugal"}]},{"given":"AMM","family":"Gon\u00e7alves","sequence":"additional","affiliation":[{"name":"University of Coimbra, MARE - Marine and Environmental Sciences Centre, Department of Life Sciences, Cal\u00e7ada Martim de Freitas, 3000-456 Coimbra, Portugal"},{"name":"Department of Biology and CESAM, University of Aveiro, 3810-193 Aveiro, Portugal"}]},{"given":"JA","family":"Ramos","sequence":"additional","affiliation":[{"name":"University of Coimbra, MARE - Marine and Environmental Sciences Centre, Department of Life Sciences, Cal\u00e7ada Martim de Freitas, 3000-456 Coimbra, Portugal"}]}],"member":"1913","reference":[{"key":"Ref1","doi-asserted-by":"publisher","DOI":"10.1016\/j.scitotenv.2017.09.232"},{"key":"Ref2","doi-asserted-by":"publisher","DOI":"10.1007\/s10344-015-0958-9"},{"key":"Ref3","doi-asserted-by":"publisher","DOI":"10.2307\/1521306"},{"key":"Ref4","doi-asserted-by":"publisher","DOI":"10.1093\/icesjms\/fsm152"},{"key":"Ref5","doi-asserted-by":"publisher","DOI":"10.18637\/jss.v067.i01"},{"key":"Ref6","doi-asserted-by":"publisher","DOI":"10.1111\/j.0021-8790.2004.00861.x"},{"key":"Ref7","doi-asserted-by":"publisher","DOI":"10.1016\/S0169-2046(97)00037-6"},{"key":"Ref8","doi-asserted-by":"crossref","unstructured":"Birnie-Gauvin K, Peiman K, Raubenheimer D, Cooke S (2017) Nutritional physiology and ecology of wildlife in a changing world. 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