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The multi-annual residency of juvenile smooth hammerhead shark in an oceanic island nursery

2022-07Journal article Open access
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dc.contributor.authorAfonso, Pedro
dc.contributor.authorGandra, Miguel
dc.contributor.authorGraça, Gonçalo
dc.contributor.authorMacena, Bruno
dc.contributor.authorVandeperre, Frederic
dc.contributor.authorFontes, Jorge
dc.date.accessioned2022-12-13T14:18:14Z
dc.date.available2022-12-13T14:18:14Z
dc.date.issued2022-07
dc.description.abstractThe increased risk of local extinction becomes critical for sharks depending on the narrow and isolated coastal habitats of oceanic islands. This includes large pelagic oceanic sharks that use such habitats as nurseries, as previously hypothesized for the smooth hammerhead Sphyrna zygaena, the least known of cosmopolitan large hammerhead sharks. We used a combination of acoustic and satellite telemetry in a juvenile population of Faial and Pico islands, Azores, mid-north Atlantic, to confirm if this isolated archipelago holds nurseries, and to answer questions related to their function and spatial-temporal stability. Our long-term acoustic tracking data showed a cluster of individual core home ranges in specific areas of north shore Faial, and surface positions from five Argos-linked tagged individuals also showed a clustering overlap in those areas for up to 1 year. These patterns seem to reveal a true habitat preference within the Faial-Pico island (sub) population of juvenile smooth hammerhead shark, and thus constitute strong evidence for this area to be considered a nursery. Some individuals remained in this nursery for up to 4 years, especially during summers. Sharks also showed a strong diel behavior, typically using the inshore nurseries during the day and moving further offshore during the night, during which they increased activity and dove deeper, most possibly to feed. We speculate that a combination of increased feeding opportunities, expanded trophic niche, and reduced predatory pressure may be a key evolutionary driver for the existence, prolonged use, and even preference of coastal nurseries at oceanic islands by juvenile smooth hammerhead shark. Given that these nurseries may constitute essential fish habitat for this species, they should be explicitly included in spatial management measures at the local and regional scales, as they may also play a role of greater importance to the north Atlantic population of this oceanic species.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doi10.3389/fmars.2022.844893pt_PT
dc.identifier.eissn2296-7745
dc.identifier.urihttp://hdl.handle.net/10400.1/18633
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherFrontiers Media SApt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectSphyrna zygaenapt_PT
dc.subjectEssential fish habitatpt_PT
dc.subjectShark nurserypt_PT
dc.subjectAcoustic telemetrypt_PT
dc.subjectSatellite telemetrypt_PT
dc.titleThe multi-annual residency of juvenile smooth hammerhead shark in an oceanic island nurserypt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleFrontiers in Marine Sciencept_PT
oaire.citation.volume9pt_PT
person.familyNameGandra
person.givenNameMiguel
person.identifier.ciencia-id4F1A-6372-FA55
person.identifier.orcid0000-0003-1506-5141
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication0110c3f0-88d0-44fc-ae8d-9a5bab5ebd23
relation.isAuthorOfPublication.latestForDiscovery0110c3f0-88d0-44fc-ae8d-9a5bab5ebd23

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