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Trophic ecology and coastal niche partitioning of two sympatric shark species in the Azores (mid-Atlantic)

2024-01-11Artigo científico Acesso aberto
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datacite.subject.sdg14:Proteger a Vida Marinha
datacite.subject.sdg02:Erradicar a Fome
datacite.subject.sdg12:Produção e Consumo Sustentáveis
dc.contributor.authorPriester, C. Robert
dc.contributor.authorDierking, Jan
dc.contributor.authorHansen, Thomas
dc.contributor.authorAbecasis, David
dc.contributor.authorFontes, Jorge M.
dc.contributor.authorAfonso, Pedro
dc.date.accessioned2026-05-20T17:33:01Z
dc.date.available2026-05-20T17:33:01Z
dc.date.issued2024-01-11
dc.description.abstractThe exploitation of marine resources has caused drastic declines of many large predatory fishes. Amongst these, sharks are of major conservation concern due to their high vulnerability to overfishing and their ecological role as top predators. The 2 protected and endangered shark species tope Galeorhinus galeus and smooth hammerhead Sphyrna zygaena use overlapping coastal areas around the globe as essential fish habitats, but data to assess their trophic ecology and niche partitioning are scarce. We provide the first comparative assessment of the trophic ecology, ontogenetic shifts, and niche partitioning of the co-occurring tope and juvenile smooth hammer head around the Azores Islands, mid-north Atlantic, based on δ13C, δ15N, and δ34S (CNS) stable isotope analysis of muscle tissue of the sharks and their putative prey species. Overall, isotopic niches of both species indicated a reliance on similar resources throughout the sampled sizes (tope: 35– 190; smooth hammerhead 54–159 cm total length), with significant ontogenetic shifts. Topes displayed a gradual shift to higher trophic levels and a more generalist diet with increasing size (increasing δ15N values and isotopic niche volumes, respectively), whereas smooth hammerhead diet shifted towards prey with lower δ34S at a constant trophic level and a more specialized diet than tope of comparable body size (decreasing δ34S and constant δ15N and δ13C values, respectively). Our results indicate contrasting ontogenetic shifts in δ13C and δ34S along with pronounced differences between niche overlap of life stages pointing to intra- and interspecific niche partitioning of habitat and prey.eng
dc.identifier.doi10.3354/meps14487
dc.identifier.eissn1616-1599
dc.identifier.issn0171-8630
dc.identifier.urihttp://hdl.handle.net/10400.1/29017
dc.language.isoeng
dc.peerreviewedyes
dc.publisherInter-Research Science Center
dc.relationAlgarve Centre for Marine Sciences
dc.relationAlgarve Centre for Marine Sciences
dc.relationCentre for Marine and Environmental Research
dc.relation.ispartofMarine Ecology Progress Series
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectSphyrna zygaena
dc.subjectGaleorhinus galeus
dc.subjectCarbon
dc.subjectNitrogen
dc.subjectSulfur
dc.subjectStable isotope analysis
dc.subjectIsotopic niche
dc.subjectEssential fish habitats
dc.subjectShark nursery
dc.titleTrophic ecology and coastal niche partitioning of two sympatric shark species in the Azores (mid-Atlantic)eng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberUIDB/04326/2020
oaire.awardNumberUIDP/04326/2020
oaire.awardNumberLA/P/0101/2020
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%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UIDP%2F04326%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.citation.endPage130
oaire.citation.startPage113
oaire.citation.titleMarine Ecology Progress Series
oaire.citation.volume726
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameAbecasis
person.givenNameDavid
person.identifier298405
person.identifier.ciencia-id7E1E-B2F7-B966
person.identifier.orcid0000-0002-9802-8153
person.identifier.ridB-2871-2012
person.identifier.scopus-author-id23017767300
project.funder.identifierhttp://doi.org/10.13039/501100001871
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.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
relation.isAuthorOfPublicationef3e9a91-cff1-419d-af31-4bc2800897dd
relation.isAuthorOfPublication.latestForDiscoveryef3e9a91-cff1-419d-af31-4bc2800897dd
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