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Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles

2019Journal article Open access
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dc.contributor.authorRaposo, Cheila
dc.contributor.authorPatrício, Ana Rita
dc.contributor.authorCatry, Paulo
dc.contributor.authorDellinger, Thomas
dc.contributor.authorGranadeiro, José P.
dc.date.accessioned2021-05-10T09:10:33Z
dc.date.available2021-05-10T09:10:33Z
dc.date.issued2019
dc.description.abstractThe loggerhead sea turtle Caretta caretta is a vulnerable migratory species that spends its frst years of life in the open sea. During this developmental phase, loggerheads can be found foraging in the epipelagic zone of the waters surrounding the Madeira Archipelago, providing a rare opportunity to gather information on the ecology of its oceanic developmental stage. In this study, we characterized the isotopic niche of these juveniles, using stable isotope analysis. We assessed two groups of turtles, turtles captured alive (n=24) and turtles captured as bycatch on local longlines (n=12), and explored whether animals caught in the local fshing gear represented a random sample of the population, or whether there is some evidence for a specialized foraging behaviour. We found that turtle bycatch had a signifcantly higher mean stable nitrogen isotope value in whole blood (δ15N=8.5±0.6‰ SD) compared to the group of turtles captured alive in the same period (δ15N=7.6±0.5‰ SD), indicating that they had a diferent diet. While there was a tendency for turtle bycatch to be slightly larger, we found no efect of body size on δ15N values. We propose a distinct foraging behaviour strategy hypothesis, with a group of turtles being more susceptible to interactions with fsheries and thus having a higher mortality risk, which should motivate the implementation of existing guidelines to reduce sea turtle bycatch.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationRaposo, C., Patrício, A. R., Catry, P., Dellinger, T., & Granadeiro, J. P. (2019). Evidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtles. Marine Biology, 166(3), 29. 10.1007/s00227-019-3466-8pt_PT
dc.identifier.doi10.1007/s00227-019-3466-8pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/3379
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherSpringerpt_PT
dc.relationTrophic links in open oceans: combining spatial data, dietary information and biomarkers from top predators to unveil structure and functioning of subtropical pelagic ecosystems
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectLoggerhead sea turtle Caretta carettapt_PT
dc.subjectCaretta carettapt_PT
dc.subjectTrophic diferencespt_PT
dc.subjectMadeira Archipelago (Portugal)pt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências da Vidapt_PT
dc.titleEvidence for trophic differences between live and bycatch oceanic juvenile loggerhead sea turtlespt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleTrophic links in open oceans: combining spatial data, dietary information and biomarkers from top predators to unveil structure and functioning of subtropical pelagic ecosystems
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FMAR-PRO%2F0929%2F2014/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FMAR%2F04292%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/Investigador FCT/IF%2F00502%2F2013%2FCP1186%2FCT0003/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876/UID%2FAMB%2F50017%2F2013/PT
oaire.citation.issue3pt_PT
oaire.citation.titleMarine Biologypt_PT
oaire.citation.volume166pt_PT
oaire.fundingStream3599-PPCDT
oaire.fundingStream5876
oaire.fundingStreamInvestigador FCT
oaire.fundingStream5876
person.familyNameDellinger
person.givenNameThomas
person.identifier.ciencia-idD21E-BADC-7807
person.identifier.orcid0000-0002-2424-8620
person.identifier.scopus-author-id7003679889
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.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
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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