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Little migrants: assessment of stranded loggerhead turtles (Caretta caretta) source populations found in the north-east atlantic

2025-11Journal article Open access
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dc.contributor.authorCorona, Luana Santos
dc.contributor.authorGalatoulas, Adam
dc.contributor.authorNicolau, Lídia
dc.contributor.authorPereira, Andreia F. T.
dc.contributor.authorSá, Sara F.
dc.contributor.authorLopes da Cunha, Regina
dc.contributor.authorMarçalo, Ana
dc.contributor.authorCastilho, Rita
dc.date.accessioned2025-11-04T13:38:47Z
dc.date.available2025-11-04T13:38:47Z
dc.date.issued2025-11
dc.description.abstractMaritime activities affect the migratory routes of marine organisms, including loggerhead turtles (Caretta caretta). The coastal waters of mainland Portugal lie along these routes, providing foraging grounds but lacking nesting beaches, making them ideal for studying turtle migration. This study presents the first assessment of the natal origins of loggerheads in the North-East Atlantic. We analysed the genetic diversity of 127 stranded loggerhead turtles along the Portuguese coast, sequencing the mitochondrial DNA control region (776 bp). Sixteen haplotypes were identified, including a previously unknown one. Mixed-stock analysis revealed that loggerhead turtles stranded in Portuguese mainland coastal waters appear to originate predominantly from the Western Atlantic, with possible contributions from other regions including Cape Verde and the Eastern Mediterranean, though the latter remains uncertain. The primary sources were Florida rookeries, particularly Canaveral National Seashore, Melbourne Beach, Juno Beach, and Ft. Lauderdale. Our findings underscore the role of oceanic circulation patterns in shaping migration routes, as turtles predominantly followed major currents across the Atlantic. The predominance of juveniles among stranded individuals in areas with known high fishing pressure indicates that Portuguese waters may pose significant anthropogenic risks for this life stage. This study highlights the vulnerability of juvenile loggerheads in Portuguese waters and underscores the need for conservation strategies, including bycatch mitigation and fisheries management. Further ecological studies, such as tag tracking, are essential to understanding migratory patterns and improving conservation efforts in this critical migratory corridor.eng
dc.description.sponsorshipUID/PRR/04326/2025
dc.identifier.doi10.1016/j.gecco.2025.e03878
dc.identifier.issn2351-9894
dc.identifier.urihttp://hdl.handle.net/10400.1/27873
dc.language.isoeng
dc.peerreviewedyes
dc.publisherElsevier
dc.relationCentre of Marine Sciences
dc.relationCentre for Marine and Environmental Research
dc.relation.ispartofGlobal Ecology and Conservation
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/
dc.subjectSea turtle
dc.subjectMix stock
dc.subjectMitochondrial DNA
dc.subjectAtlantic Ocean
dc.subjectForaging ground
dc.titleLittle migrants: assessment of stranded loggerhead turtles (Caretta caretta) source populations found in the north-east atlanticeng
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleCentre of Marine Sciences
oaire.awardTitleCentre for Marine and Environmental Research
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FMulti%2F04326%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/LA%2FP%2F0101%2F2020/PT
oaire.citation.titleGlobal Ecology and Conservation
oaire.citation.volume63
oaire.fundingStream6817 - DCRRNI ID
oaire.fundingStream6817 - DCRRNI ID
oaire.versionhttp://purl.org/coar/version/c_970fb48d4fbd8a85
person.familyNameLopes da Cunha
person.familyNameMarçalo
person.familyNameCastilho
person.givenNameRegina
person.givenNameAna
person.givenNameRita
person.identifierR-000-JHM
person.identifier452212
person.identifier.ciencia-id7314-E2C4-78A2
person.identifier.ciencia-id0513-0407-A6C1
person.identifier.orcid0000-0002-4275-9723
person.identifier.orcid0000-0002-0485-341X
person.identifier.orcid0000-0003-0727-3688
person.identifier.ridM-3463-2013
person.identifier.ridB-6185-2008
person.identifier.scopus-author-id8855869800
person.identifier.scopus-author-id6505855915
person.identifier.scopus-author-id56271196600
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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