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Local indicators for global species: Pelagic sharks in the tropical northeast Atlantic, Cabo Verde islands region

2020Journal article Open access
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dc.contributor.authorCoelho, Rui
dc.contributor.authorMacías, David
dc.contributor.authorOrtiz de Urbina, Josetxu
dc.contributor.authorMartins, Albertino
dc.contributor.authorMonteiro, Carlos
dc.contributor.authorLino, Pedro G.
dc.contributor.authorRosa, Daniela
dc.contributor.authorCasaca Santos, Catarina
dc.contributor.authorBach, Pascal
dc.contributor.authorMurua, Hilario
dc.contributor.authorAbaunza, Pablo
dc.contributor.authorSantos, Miguel N.
dc.date.accessioned2020-12-04T10:52:53Z
dc.date.available2021-03-01T01:30:23Z
dc.date.issued2020
dc.description.abstractPelagic sharks are an important bycatch in pelagic fisheries, especially for drifting longlines targeting swordfish. In the Cabo Verde Archipelago (tropical NE Atlantic), pelagic shark catches can reach a significant proportion of the total catches. Due to the increased concern on the status of pelagic shark species, this study was developed to enhance the current knowledge of those sharks in the Cabo Verde region in comparison to the adjacent areas, especially associated with European Union (EU) pelagic longline fishing activity. Stock status indicators for the two main species, blue shark (Prionace glauca) and shortfin mako (Isurus oxyrinchus), were developed, based on fisheries data from logbooks and onboard scientific observers, including analysis of size frequency distributions and standardized catch-per-unit-of-effort (CPUE) indexes over time. The standardized CPUEs have been stable or increasing for both species in the past 10 years, indicating no signs of local depletion. In terms of sizes, the blue shark catch is composed mainly of adults, which can be a sign of a stable population. On the contrary, the catch of shortfin mako is composed mainly of juveniles, which in conjunction of a decrease of mean size might be a cause of concern, highlighting possible overfishing on the species in the region. Thirty satellite tags, 25 archival miniPATs and 5 SPOT GPS, were deployed in the Cabo Verde Exclusive Economic Zone (EEZ), showing that those species are highly mobile. The biomass and size distributions were modeled with spatial and seasonal models (GAMs) identifying locations where juveniles are predominantly concentrated and that should be prioritized for conservation. This work presents new information on the status of pelagic sharks in the Cabo Verde region in the context of those highly migratory species, and can now be used to promote more sustainable fisheries in the region.pt_PT
dc.description.sponsorshipFCT IF/00253/2014, SFRH/BD/136074/2018, SFRH/BD/139187/2018, EU/MARE/2012/21: “Scientific advice for fisheries beyond EU waters”, specifically within Specific Contract N° 7: “The provision of advice on the conservation of pelagic sharks associated to fishing activity under EU Sustainable Fisheries Partnership Agreements in the Atlantic Ocean”.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.1016/j.ecolind.2019.105942pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.1/14880
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S1470160X19309379?via%3Dihubpt_PT
dc.titleLocal indicators for global species: Pelagic sharks in the tropical northeast Atlantic, Cabo Verde islands regionpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.startPage105942pt_PT
oaire.citation.titleEcological Indicatorspt_PT
oaire.citation.volume110pt_PT
person.familyNameCoelho
person.familyNameRosa
person.familyNameCasaca Santos
person.givenNameRui
person.givenNameDaniela
person.givenNameCatarina
person.identifier134638
person.identifier.ciencia-idDC1A-20B7-EAC0
person.identifier.ciencia-id0512-E394-FF42
person.identifier.orcid0000-0003-3813-5157
person.identifier.orcid0000-0001-7156-7408
person.identifier.orcid0000-0002-2253-0737
person.identifier.ridC-1163-2008
person.identifier.scopus-author-id56257111100
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication6366aa1b-1301-43a3-b2b0-1280311ac95f
relation.isAuthorOfPublicationa9de9fd6-e33b-4a43-b9fb-3b9cb4cdd433
relation.isAuthorOfPublicationf9c93cfc-9da0-4049-909e-41c83114e549
relation.isAuthorOfPublication.latestForDiscoverya9de9fd6-e33b-4a43-b9fb-3b9cb4cdd433

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