{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,6]],"date-time":"2026-03-06T04:02:06Z","timestamp":1772769726477,"version":"3.50.1"},"reference-count":96,"publisher":"Oxford University Press (OUP)","issue":"6","license":[{"start":{"date-parts":[[2019,7,30]],"date-time":"2019-07-30T00:00:00Z","timestamp":1564444800000},"content-version":"vor","delay-in-days":365,"URL":"https:\/\/academic.oup.com\/journals\/pages\/open_access\/funder_policies\/chorus\/standard_publication_model"}],"funder":[{"name":"VHP"},{"DOI":"10.13039\/501100006424","name":"FRC","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100006424","id-type":"DOI","asserted-by":"publisher"}]},{"name":"JGC","award":["SFRH\/BPD\/85024\/2012"],"award-info":[{"award-number":["SFRH\/BPD\/85024\/2012"]}]},{"name":"JGC","award":["SFRH\/BPD\/95372\/2013"],"award-info":[{"award-number":["SFRH\/BPD\/95372\/2013"]}]},{"name":"JGC","award":["PD\/BD\/127991\/2016"],"award-info":[{"award-number":["PD\/BD\/127991\/2016"]}]},{"name":"JGC","award":["UID\/MAR\/04292\/2013"],"award-info":[{"award-number":["UID\/MAR\/04292\/2013"]}]},{"DOI":"10.13039\/100006129","name":"FCT","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100006129","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Ria Formosa Natural Park"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2018,12,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Fisheries produce large quantities of discards, an important resource for scavenging seabirds. However, a policy reform banning discards, which is soon to be implemented within the EU, will impose a food shortage upon scavengers, and it is still largely unknown how scavengers will behave. We studied the diet (hard remains), trophic (stable isotope analysis), and foraging (individual tracking) ecology of two gull species breeding in sympatry: Audouin\u2019s gull Larus audouinii (AG) and yellow-legged gull Larus michahellis (YLG), in South Portugal, under normal fishery activity (NFA; work days) and low fishery activity (LFA; weekends), over two consecutive years. We established a pattern of dietary, spatial, and temporal segregation between the two gull species. Under LFA, yellow-legged gulls reduced their time spent at-sea, thus foraging more in alternative habitats (e.g. refuse dumps) and widening their isotopic niche (i.e. generalist behaviour). Contrastingly, Audouin\u2019s gull had a narrower trophic niche (i.e. specialist behaviour), foraging exclusively at-sea, reducing the amount of demersal fish and increasing the amount of pelagic fish in their diet. Under NFA, both species foraged mostly at-sea, feeding almost exclusively on fish, with increased consumption of demersal species (i.e. fishery discards). In general, yellow-legged gull had a broader trophic niche (i.e. generalist behaviour) when compared with the narrower isotopic niche of Audouin\u2019s gull (i.e. specialist behaviour). Overall, both gull species relied heavily on fishery discards. However, there was visible dietary, spatial, and temporal segregation between the two species, associated with their dietary and habitat preferences that could be attributed to the availability of anthropogenic resources, such as fishery discards.<\/jats:p>","DOI":"10.1093\/icesjms\/fsy096","type":"journal-article","created":{"date-parts":[[2018,6,27]],"date-time":"2018-06-27T12:14:15Z","timestamp":1530101655000},"page":"1949-1964","source":"Crossref","is-referenced-by-count":44,"title":["How fishing intensity affects the spatial and trophic ecology of two gull species breeding in sympatry"],"prefix":"10.1093","volume":"75","author":[{"given":"Diana M","family":"Matos","sequence":"first","affiliation":[{"name":"Department of Life Sciences, MARE\u2014Marine and Environmental Sciences Centre, University of Coimbra, Rua da Matem\u00e1tica 49, Coimbra, Portugal"}]},{"given":"Jaime A","family":"Ramos","sequence":"first","affiliation":[{"name":"Department of Life Sciences, MARE\u2014Marine and Environmental Sciences Centre, University of Coimbra, Rua da Matem\u00e1tica 49, Coimbra, Portugal"}]},{"given":"Joana G","family":"Calado","sequence":"first","affiliation":[{"name":"Department of Life Sciences, MARE\u2014Marine and Environmental Sciences Centre, University of Coimbra, Rua da Matem\u00e1tica 49, Coimbra, Portugal"}]},{"given":"Filipe R","family":"Ceia","sequence":"first","affiliation":[{"name":"Department of Life Sciences, MARE\u2014Marine and Environmental Sciences Centre, University of Coimbra, Rua da Matem\u00e1tica 49, Coimbra, Portugal"}]},{"given":"Jessica","family":"Hey","sequence":"first","affiliation":[{"name":"Cardiff School of Biosciences, Cardiff University, The Sir Martin Evans Building, Museum Ave, Cardiff, UK"}]},{"given":"Vitor H","family":"Paiva","sequence":"first","affiliation":[{"name":"Department of Life Sciences, MARE\u2014Marine and Environmental Sciences Centre, University of Coimbra, Rua da Matem\u00e1tica 49, Coimbra, Portugal"}]}],"member":"286","published-online":{"date-parts":[[2018,7,30]]},"reference":[{"key":"2020030521272278000_fsy096-B1","doi-asserted-by":"crossref","first-page":"657","DOI":"10.1007\/s00227-013-2368-4","article-title":"Foraging movements and habitat niche of two closely related seabirds breeding in sympatry","volume":"161","author":"Af\u00e1n","year":"2014","journal-title":"Marine Biology"},{"key":"2020030521272278000_fsy096-B2","doi-asserted-by":"crossref","first-page":"123","DOI":"10.1016\/j.scitotenv.2017.09.232","article-title":"Potential for gulls to transport bacteria from human waste sites to beaches","volume":"615","author":"Alm","year":"2018","journal-title":"Science of the Total Environment"},{"key":"2020030521272278000_fsy096-B3","doi-asserted-by":"crossref","first-page":"297","DOI":"10.1007\/s11367-013-0646-5","article-title":"Environmental assessment of sardine (Sardina pilchardus) purse seine fishery in Portugal with LCA methodology including biological impact 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