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Size-based differences in isotopic niche width (delta C-13 and delta N-15) of green turtles (Chelonia mydas) nesting on Principe Island, Gulf of Guinea

2021-02Journal article Restricted access
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dc.contributor.authorFerreira, Rogério L.
dc.contributor.authorCeia, Filipe R.
dc.contributor.authorBorges, Teresa C.
dc.contributor.authorRamos, Jaime A.
dc.contributor.authorBolten, Alan B.
dc.date.accessioned2021-09-08T10:58:09Z
dc.date.available2021-09-08T10:58:09Z
dc.date.issued2021-02
dc.description.abstractWithin the same population, nesting green turtles (Chelonia mydas) might exploit different niches by exhibiting polymorphic foraging strategies and/or inhabiting geographically distinct foraging areas. This is crucial information for the conservation of this species. Here, we used stable carbon and nitrogen isotope ratios (delta C-13 and delta N-15) to test for differences in a population of green turtles nesting on Principe Island (1 degrees 37 ' N; 7 degrees 24'E), Central Africa. A total of 60 nesting females were sampled on the two main nesting beaches of the island in December 2012. Minimum curved carapace length (CCL) was recorded, and delta C-13 and delta N-15 values were measured in the epidermis of each individual. Overall, CCL varied from 87.0 to 108.0 cm (mean +/- SD =100.0 +/- 5.1), delta C-13 values from -19.4 to -8.6 parts per thousand (-17.3 +/- 1.8) and delta N-15 values from 7.9 to 17.3 parts per thousand (13.6 +/- 1.5). Despite the large variation in both isotopic ratios, their distributions were unimodal, showing an absence of polymorphic foraging strategies and isotopically distinct foraging areas. However, smaller females (< median, 100.8 cm) occupied a much larger isotopic niche (i.e., four times greater) than larger females. These results suggest that nesting green turtles may forage opportunistically on the resources available in each of their foraging home ranges, with smaller females venturing to more isotopic-diversified areas and/or exhibiting broader foraging strategies than larger females. In addition, and in accordance with other studies, findings suggest that the foraging grounds used by the Principe green turtle nesting females are distributed mainly throughout the Gulf of Guinea.
dc.description.sponsorshipFoundation for Science and Technology; European Social FundEuropean Social Fund (ESF) [SFRH/BD/73947/2010, SFRH/BPD/95372/2013]; FCT strategic program of MARE [UID/MAR/04292/2013]
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1111/maec.12636
dc.identifier.issn0173-9565
dc.identifier.urihttp://hdl.handle.net/10400.1/17046
dc.language.isoeng
dc.peerreviewedyes
dc.publisherWILEY
dc.relationREPRODUCTIVE BIOLOGY AND NEST SITE SELECTION OF THE HAWKSBILL TURTLE, ERETMOCHELYS IMBRICATA, POPULATION OF PRÍNCIPE ISLAND
dc.relationTracing marine wildlife movement patterns in the North Atlantic environment: an isotopic approach
dc.relationMARE - Marine and Environmental Sciences Centre
dc.subjectConnectivity
dc.subjectEastern Atlantic
dc.subjectIsotopic niche
dc.subjectSea turtles
dc.subjectStable isotopes
dc.subjectTrophic ecology
dc.subject.otherMarine & Freshwater Biology
dc.titleSize-based differences in isotopic niche width (delta C-13 and delta N-15) of green turtles (Chelonia mydas) nesting on Principe Island, Gulf of Guinea
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleREPRODUCTIVE BIOLOGY AND NEST SITE SELECTION OF THE HAWKSBILL TURTLE, ERETMOCHELYS IMBRICATA, POPULATION OF PRÍNCIPE ISLAND
oaire.awardTitleTracing marine wildlife movement patterns in the North Atlantic environment: an isotopic approach
oaire.awardTitleMARE - Marine and Environmental Sciences Centre
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBD%2F73947%2F2010/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT//SFRH%2FBPD%2F95372%2F2013/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FMAR%2F04292%2F2013/PT
oaire.citation.issue1
oaire.citation.startPagee12636
oaire.citation.titleMarine Ecology-An Evolutionary Perspective
oaire.citation.volume42
oaire.fundingStream6817 - DCRRNI ID
person.familyNameFerreira
person.familyNameBorges
person.givenNameRogério
person.givenNameTeresa Cerveira
person.identifier.ciencia-id5A1E-E8AD-3E24
person.identifier.orcid0000-0002-5140-7244
person.identifier.orcid0000-0002-6414-0083
person.identifier.ridM-3388-2013
person.identifier.scopus-author-id6604001208
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
rcaap.rightsrestrictedAccess
rcaap.typearticle
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relation.isAuthorOfPublication7975c9b8-d25a-4bec-91f4-d1193a8e8082
relation.isAuthorOfPublication.latestForDiscovery222f1040-63d1-420c-af7a-fa839a330c1c
relation.isProjectOfPublication85c91e5f-cfda-455a-9f96-2dcbe181c0a7
relation.isProjectOfPublication04f85ba6-d132-4226-a203-fd01296a28d4
relation.isProjectOfPublication10d45e59-7729-4f62-9521-f5adc560d562
relation.isProjectOfPublication.latestForDiscovery10d45e59-7729-4f62-9521-f5adc560d562

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