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Towards mitigation of seabird bycatch: Large-scale effectiveness of night setting and Tori lines across multiple pelagic longline fleets

2020Journal article Restricted access
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dc.contributor.authorJiménez, Sebastián
dc.contributor.authorDomingo, Andrés
dc.contributor.authorWinker, Henning
dc.contributor.authorParker, Denham
dc.contributor.authorGianuca, Dimas
dc.contributor.authorNeves, Tatiana
dc.contributor.authorCoelho, Rui
dc.contributor.authorKerwath, Sven
dc.date.accessioned2020-12-02T13:48:10Z
dc.date.available2022-07-01T00:30:17Z
dc.date.issued2020
dc.description.abstractBycatch in pelagic longline fleets remains a considerable source of mortality for threatened seabirds. Despite efforts to implement mitigation measures, the effectiveness of their application across multiple fleets and wide spatio-temporal scales remains poorly understood. We analyse about 15,800 sets and 36.4 million hooks observed during 583 trips aboard 132 vessels from five pelagic longline fleets (Brazil, Portugal, South Africa, Uruguay and foreign charter-vessels) operating in the south Atlantic and southwestern Indian Oceans (2002–2016) to assess the large-scale effect on bycatch rates of the implementation over time of night-setting and Tori (bird-scaring or streamer) lines. There was a highly significant decrease in standardised bycatch rate from 2002 to 2008 to 2009–2011 and a further reduction in 2012–2016, as consequence of an increased use of mitigation measures. This reduction on fleet-wide bycatch rates temporally coincides with the progressive implementation of mitigation measures in the two relevant Regional Fishery Management Organisations. Night-setting significantly reduced bycatch rates under all conditions, particularly for albatrosses. Surprisingly, bycatch rate during daylight was higher when Tori lines were deployed. Inconsistencies in Tori line deployments, entanglements with the fishing gear and the non-use of this measure with low seabird abundance may explain this pattern. At night, relative moon illumination increased bycatch rate, especially of petrels, but Tori lines significantly reduced seabird bycatch. Our results imply that a major reduction in global bycatch of threatened seabirds could be achieved, if night setting and Tori lines are correctly applied and extensively implemented by fleets operating south of 25°S.pt_PT
dc.description.sponsorshipFCT IF/00253/2014pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.biocon.2020.108642pt_PT
dc.identifier.issn0006-3207
dc.identifier.urihttp://hdl.handle.net/10400.1/14856
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S000632072030700X?via%3Dihubpt_PT
dc.subjectBycatch reductionpt_PT
dc.subjectAlbatrosspt_PT
dc.subjectPetrept_PT
dc.subjectTori linept_PT
dc.subjectTuna RFMOspt_PT
dc.titleTowards mitigation of seabird bycatch: Large-scale effectiveness of night setting and Tori lines across multiple pelagic longline fleetspt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage108642pt_PT
oaire.citation.titleBiological Conservationpt_PT
oaire.citation.volume247pt_PT
person.familyNameCoelho
person.givenNameRui
person.identifier134638
person.identifier.ciencia-idDC1A-20B7-EAC0
person.identifier.orcid0000-0003-3813-5157
person.identifier.ridC-1163-2008
person.identifier.scopus-author-id56257111100
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication6366aa1b-1301-43a3-b2b0-1280311ac95f
relation.isAuthorOfPublication.latestForDiscovery6366aa1b-1301-43a3-b2b0-1280311ac95f

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