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Foraging ecology of the critically endangered hawksbill sea turtle in the Gulf of Guinea

2026-08Artigo científico Acesso aberto
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datacite.subject.sdg14:Proteger a Vida Marinha
datacite.subject.sdg15:Proteger a Vida Terrestre
datacite.subject.sdg13:Ação Climática
dc.contributor.authorVieira, Sara
dc.contributor.authorFerreira-Airaud, Betânia
dc.contributor.authorBaptista, Vânia
dc.contributor.authorTiwari, Manjula
dc.contributor.authorCastilho, Rita
dc.contributor.authorTeodosio, Maria
dc.date.accessioned2026-06-30T13:50:00Z
dc.date.available2026-06-30T13:50:00Z
dc.date.issued2026-08
dc.description.abstractUnderstanding the ecological roles of critically endangered species is essential for effective conservation planning. This study investigates the foraging ecology and nutritional condition of the hawksbill sea turtle (Eretmochelys imbricata) in São Tomé Island, a key foraging ground in the Gulf of Guinea. We integrated stable isotope analyses of epidermal tissues with RNA/DNA ratios to assess habitat use, trophic position, and physiological status across life stages. Thirty hawksbill turtles (juveniles and adults) were sampled during in-water surveys conducted between 2021 and 2022 using minimally invasive techniques. Prey samples were also collected for isotopic baselines. Carbon (δ13C) and nitrogen (δ15N) values revealed significant ontogenetic shifts, with adults occupying broader isotopic niches. While sponges remained the dominant food source at both stages, adults exhibited greater dietary diversity, including red algae and tunicates. Juveniles showed higher spatial and temporal fidelity, suggesting stronger residency patterns. Estimated trophic positions ranged from 2.57 to 2.79, consistent with secondary consumers. RNA/DNA ratios indicated higher metabolic activity in juveniles and males, while lower values in females likely reflect reproductive metabolic suppression. These findings represent the first integrative assessment of hawksbill turtle foraging and nutritional condition in the region. The study provides critical baseline data on one of the most genetically isolated and endangered hawksbill populations worldwide. This approach enhances understanding of their ecological function and supports the development of targeted conservation actions that account for life-stage–specific needs, contributing to adaptive management and long-term recovery of this critically endangered population.eng
dc.description.sponsorshipUID/04326/2025; UID/PRR/04326/2025
dc.identifier.doi10.1016/j.marenvres.2026.108119
dc.identifier.issn0141-1136
dc.identifier.urihttp://hdl.handle.net/10400.1/29174
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier BV
dc.relationCentre for Marine and Environmental Research
dc.relation“Population assessment and management needs of the hawksbill sea turtle, Eretmochelys imbricata, in São Tomé and Príncipe”
dc.relation.ispartofMarine Environmental Research
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectSão Tomé and Príncipe
dc.subjectEretmochelys imbricata
dc.subjectRNA/DNA
dc.subjectStable isotopes
dc.subjectFeeding ecology
dc.subjectEcophysiology
dc.subjectConservation
dc.titleForaging ecology of the critically endangered hawksbill sea turtle in the Gulf of Guineaeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardNumberLA/P/0101/2020
oaire.awardNumberUI/BD/151308/2021
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardTitle“Population assessment and management needs of the hawksbill sea turtle, Eretmochelys imbricata, in São Tomé and Príncipe”
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/OE/UI%2FBD%2F151308%2F2021/PT
oaire.citation.startPage108119
oaire.citation.titleMarine Environmental Research
oaire.citation.volume220
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStreamOE
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameVieira
person.familyNameFerreira-Airaud
person.familyNameBaptista
person.familyNameCastilho
person.familyNameTeodosio
person.givenNameSara
person.givenNameBetânia
person.givenNameVânia
person.givenNameRita
person.givenNameMaria
person.identifier479502
person.identifier452212
person.identifier.ciencia-id0C1F-4F1B-256B
person.identifier.ciencia-id0513-0407-A6C1
person.identifier.ciencia-idAF10-647B-65FB
person.identifier.orcid0000-0001-6113-1862
person.identifier.orcid0000-0002-2874-1367
person.identifier.orcid0000-0002-1428-3334
person.identifier.orcid0000-0003-0727-3688
person.identifier.orcid0000-0002-0939-9885
person.identifier.ridB-6185-2008
person.identifier.ridB-5077-2013
person.identifier.scopus-author-id55820032600
person.identifier.scopus-author-id56271196600
person.identifier.scopus-author-id56196396700
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
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