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Long-term multitracking reveals contrasting yet highly resident movement ecologies of two sympatric and endangered deep-sea sharks

2025-10Artigo científico Acesso aberto
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datacite.subject.sdg14:Proteger a Vida Marinha
datacite.subject.sdg13:Ação Climática
datacite.subject.sdg09:Indústria, Inovação e Infraestruturas
dc.contributor.authorGandra, Miguel
dc.contributor.authorFontes, Jorge
dc.contributor.authorMacena, Bruno C.L.
dc.contributor.authorMeyer, Carl G.
dc.contributor.authorAfonso, Pedro
dc.date.accessioned2026-03-20T15:39:16Z
dc.date.available2026-03-20T15:39:16Z
dc.date.issued2025-10
dc.description.abstractStudying shark movement ecology is vital for understanding their ecological roles and supporting sustainable management and conservation strategies. However, such information remains scarce for deep-sea sharks. We used biotelemetry to investigate the spatial behaviour and movements of two endangered deep-sea predators, the kitefin (Dalatias licha) and bluntnose sixgill (Hexanchus griseus) sharks, in the Azores, northern Mid-Atlantic Ridge. We tagged a total of 21 kitefin sharks with acoustic transmitters (some including depth sensors) and seven sixgill sharks with different tag configurations: three were fitted exclusively with acoustic transmitters, two were double-tagged with both acoustic transmitters and pop-up satellite archival tags (PSATs), and two were tagged exclusively with PSATs deployed via a speargun-equipped submersible. Both species exhibited diel vertical migrations and unexpected high site fidelity (up to 4 years), using habitats that inter-connect seamounts, slopes, and island shelves. Sixgill sharks exhibited more extensive and diverse individual home ranges and vertical diel activity patterns than kitefin sharks. Sexual segregation was evident in kitefin sharks, with males and females displaying distinct differences in depth distribution and habitat use, supporting earlier hypotheses based on fisheries data. These behavioural patterns suggest that sixgill sharks function as wide-ranging, deep-sea opportunistic foragers and predators, traversing interconnected habitats in search of prey – including kitefin sharks, which occupy a more slope-associated mesopredator niche. Our novel findings support ecological theory suggesting that deep-sea sharks exhibit far more contrasting spatial ecologies than previously thought, driven by their life histories. These differences may have implications for their high vulnerability to fisheries and climate change-induced habitat degradation.eng
dc.description.sponsorship01-0145-FEDER-000140; 817669; 862428; UI&D/003/2021–2024
dc.identifier.doi10.1016/j.ocecoaman.2025.107782
dc.identifier.issn0964-5691
dc.identifier.urihttp://hdl.handle.net/10400.1/28496
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationNeuropeptide Y NPY system as a new target to delay aging
dc.relationNew Approach to Underwater Technologies for Innovative, Low-cost Ocean obServation
dc.relationAlgarve Centre for Marine Sciences
dc.relationUnderstanding behavioural rules in movements of marine megafauna
dc.relationUAc - Okeanos R&D Centre - University of the Azores
dc.relation.ispartofOcean & Coastal Management
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectBiotelemetry
dc.subjectHexanchus griseus
dc.subjectDalatias licha
dc.subjectSpatial ecology
dc.subjectSite fidelity
dc.subjectSexual segregation
dc.subjectDeep-sea conservation
dc.titleLong-term multitracking reveals contrasting yet highly resident movement ecologies of two sympatric and endangered deep-sea sharkseng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberSFRH/BD/120023/2016
oaire.awardNumber101000825
oaire.awardNumberUIDB/04326/2020
oaire.awardNumberUI/BD/151309/2021
oaire.awardNumberUIDB/05634/2020
oaire.awardTitleNeuropeptide Y NPY system as a new target to delay aging
oaire.awardTitleNew Approach to Underwater Technologies for Innovative, Low-cost Ocean obServation
oaire.awardTitleAlgarve Centre for Marine Sciences
oaire.awardTitleUnderstanding behavioural rules in movements of marine megafauna
oaire.awardTitleUAc - Okeanos R&D Centre - University of the Azores
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/POR_CENTRO/SFRH%2FBD%2F120023%2F2016/PT
oaire.awardURIinfo:eu-repo/grantAgreement/EC/H2020/101000825/EU
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//UI%2FBD%2F151309%2F2021/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDB%2F05634%2F2020/PT
oaire.citation.startPage107782
oaire.citation.titleOcean & Coastal Management
oaire.citation.volume269
oaire.fundingStreamPOR_CENTRO
oaire.fundingStreamH2020
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameGandra
person.givenNameMiguel
person.identifier.ciencia-id4F1A-6372-FA55
person.identifier.orcid0000-0003-1506-5141
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100008530
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project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameEuropean Commission
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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