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Fine-scale foraging segregation in a green turtle (Chelonia mydas) feeding ground in the Bijagós archipelago, Guinea Bissau

2022Journal article Open access
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dc.contributor.authorMadeira, Fernando Miguel
dc.contributor.authorRebelo, Rui
dc.contributor.authorCatry, Paulo
dc.contributor.authorNeiva, João Guilherme
dc.contributor.authorBarbosa, Castro
dc.contributor.authorRegalla De Barros, Aissa
dc.contributor.authorPatrício, Ana Rita
dc.date.accessioned2022-11-15T16:08:13Z
dc.date.available2022-11-15T16:08:13Z
dc.date.issued2022
dc.description.abstractGreen turtles (Chelonia mydas) are highly dependent on neritic foraging areas throughout much of their life. Still, knowledge of recruitment dynamics, foraging habits, and habitat use in these areas is limited. Here, we evaluated how the distribution and food preferences of green sea turtles from different life stages varied within a foraging aggregation. We focused on two islands in Guinea-Bissau, Unhocomo and Unhocomozinho, using water captures and survey dives to record habitat use and characteristics, and stable isotopes to infer diet. Additionally, we used stable isotopes to infer their diet. Two habitat types were sampled: deeper (2.26 ± 0.4 m) rocky sites fringed by mangrove with macroalgae, and sandy shallows (1.37 ± 0.12 m) surrounded by rocky reefs with macroalgae and seagrass. The two benthic communities were similar isotopically and in terms of species composition, except for the presence or absence of seagrass, which had unique signatures. We captured 89 turtles ranging from 35 cm to 97 cm in curved carapace length (i.e., juvenile to adult stages). Size distribution was habitat-dependent, with most smaller turtles present in sandy shallows and larger turtles favoring slightly deeper rocky sites. Turtle isotopic signatures differed between the habitat of capture, regardless of size, revealing a marked dichotomy in foraging preference. All turtles fed primarily on macroalgae, mostly rhodophytes. However, individuals captured in sandy habitats had evident seagrass skewed isotopic signatures. Larger turtles may be unable to use the more diverse shallower foraging sites due to increased vulnerability to predation. Despite the proximity of the sampled foraging sites (2.7 km apart), the two foraging subgroups seem to maintain consistently different feeding habits. Our study highlights how heterogeneous green turtle foraging habits can be within populations, even at small geographic scales.pt_PT
dc.description.sponsorshipCITESpt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMadeira, F. M.,Rebelo, R., Catry, P. , Neiva, J., Barbosa, C. Regalla, A. & Patrício, A. R. (2022). Fine-scale foraging segregation in a green turtle (Chelonia mydas) feeding ground in the Bijagós archipelago, Guinea Bissau. Frontiers in Marine Science, 9. https://doi.org/10.3389/fmars.2022.984219pt_PT
dc.identifier.doi10.3389/fmars.2022.984219pt_PT
dc.identifier.issn22967745
dc.identifier.urihttp://hdl.handle.net/10400.12/8808
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherFrontiers Media S.A.pt_PT
dc.relation004/ONGC/2022pt_PT
dc.relation22PTLX000731pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectChelonia mydas (green turtle)pt_PT
dc.subjectForaging segregationpt_PT
dc.subjectStable isotopespt_PT
dc.subjectDietary studiespt_PT
dc.subjectBijago´ s archipelagopt_PT
dc.subjectMacrophytespt_PT
dc.titleFine-scale foraging segregation in a green turtle (Chelonia mydas) feeding ground in the Bijagós archipelago, Guinea Bissaupt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.conferencePlaceSwitzerlandpt_PT
oaire.citation.endPage13pt_PT
oaire.citation.startPage1pt_PT
oaire.citation.titleFrontiers in Marine Sciencept_PT
oaire.citation.volume9pt_PT
person.familyNameCatry
person.familyNameNeiva
person.familyNameRegalla de Barros
person.familyNameRita Caldas Patrício
person.givenNamePaulo
person.givenNameJoão Guilherme
person.givenNameAissa
person.givenNameAna
person.identifierB-3437-2019
person.identifier.ciencia-idEF1A-6A4A-013A
person.identifier.ciencia-id8D15-F799-1252
person.identifier.orcid0000-0003-3000-0522
person.identifier.orcid0000-0003-3081-5537
person.identifier.orcid0000-0003-1522-8211
person.identifier.orcid0000-0003-4963-2343
person.identifier.ridI-5408-2013
person.identifier.scopus-author-id7003725276
person.identifier.scopus-author-id53981714800
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
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relation.isAuthorOfPublication2b1eccaf-7262-443f-bc58-f3f281ed4d38
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relation.isAuthorOfPublicationf7b4c081-4776-4d08-b519-4ed8f9077476
relation.isAuthorOfPublication.latestForDiscovery2b1eccaf-7262-443f-bc58-f3f281ed4d38

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