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Seasonal variation in seabird abundance and bycatch at artisanal bottom-set net fisheries in the southern Iberian Atlantic coast

2025-08Journal article Open access
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dc.contributor.authorPereira, Jorge M.
dc.contributor.authorRamos, Jaime A.
dc.contributor.authorAlmeida, Ana
dc.contributor.authorMarçalo, Ana
dc.contributor.authorCarvalho, Flávia
dc.contributor.authorFagundes, Isabel
dc.contributor.authorGonçalves, Jorge Manuel Santos
dc.contributor.authorFrade, Magda
dc.contributor.authorOliveira, Nuno
dc.contributor.authorNascimento, Tânia
dc.contributor.authorPaiva, Vitor H.
dc.date.accessioned2025-04-23T10:37:40Z
dc.date.available2025-04-23T10:37:40Z
dc.date.issued2025-08
dc.description.abstractBycatch is a major cause of seabird mortality, yet most studies focus on industrial fisheries, with limited knowledge on artisanal fisheries. This study investigates the seasonal abundance of seabirds off the southern-eastern coast of mainland Portugal, their attendance at artisanal bottom-set net fisheries, and observed bycatch, using onboard observations and fishermen interviews. From March 2020 to November 2022, 24,643 seabirds were observed attending fishing vessels in 183 daily fishing trips (98.4 % of 186 trips), spanning 20 species across 7 families, with 25 seabirds recorded as bycatch. Lesser black-backed and Yellow-legged gulls (Larus fuscus and Larus michahellis) were the most abundant species, followed by Audouin's gulls (Ichthyaetus audouinii), Great shearwaters (Ardenna gravis), and Northern gannets (Morus bassanus). During summer, the abundance of Yellow-legged and Audouin's gulls (local breeders) and Lesser black-backed gulls (non-breeding species) increased with fishery catch per unit effort. Great shearwaters were more affected by gear type, exhibiting higher attendance and bycatch in trammel nets during autumn. 65 % of Great shearwater bycatch occurred during a single fishing event, probably from fishermen cleaning nets and discarding fish and viscera during net setting. Fishermen interviews identified Northern gannets and Great cormorants (Phalacrocorax carbo) as the most frequently bycaught species, particularly in winter when onboard observations were limited. These findings underscore the impact of artisanal fisheries on seabird populations and highlight the importance of combining onboard data with fishermen interviews to improve bycatch estimates and inform conservation efforts. Our study also suggests that fishermen behaviour during fishery operations significantly influence seabird bycatch.eng
dc.description.sponsorshipLIFE18 NAT/PT/000927; 2022.07032.CEECIND/CP1714/CT0009; 2021.01812.CEECIND/CP1656/CT0014
dc.identifier.doi10.1016/j.ocecoaman.2025.107660
dc.identifier.issn0964-5691
dc.identifier.urihttp://hdl.handle.net/10400.1/27070
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationMarine and Environmental Sciences Centre
dc.relationMarine and Environmental Sciences Centre
dc.relationAquatic Research Infrastructure Network
dc.relationAlgarve Centre for Marine Sciences
dc.relationAlgarve Centre for Marine Sciences
dc.relationCentre for Marine and Environmental Research
dc.relation.ispartofOcean & Coastal Management
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectFishermen interviews
dc.subjectOnboard observations
dc.subjectSeabird-fishery interactions
dc.subjectSmall-scale fisheries
dc.subjectTrammel nets
dc.titleSeasonal variation in seabird abundance and bycatch at artisanal bottom-set net fisheries in the southern Iberian Atlantic coasteng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleMarine and Environmental Sciences Centre
oaire.awardTitleMarine and Environmental Sciences Centre
oaire.awardTitleAquatic Research Infrastructure Network
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04292%2F2020/PT
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oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.citation.startPage107660
oaire.citation.titleOcean & Coastal Management
oaire.citation.volume267
oaire.fundingStream6817 - DCRRNI ID
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oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameMarçalo
person.familyNameCarvalho
person.familyNameGonçalves
person.familyNameFrade
person.givenNameAna
person.givenNameFlávia
person.givenNameJorge Manuel Santos
person.givenNameMagda
person.identifierR-000-JHM
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person.identifier.ciencia-id1013-ED6A-65EB
person.identifier.orcid0000-0002-0485-341X
person.identifier.orcid0009-0001-2751-7689
person.identifier.orcid0000-0001-7704-8190
person.identifier.orcid0000-0002-4006-5648
person.identifier.ridG-5206-2011
person.identifier.scopus-author-id6505855915
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project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
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