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Foraging behavior of juvenile loggerhead sea turtles in the open ocean: from Lévy exploration to area-restricted search

2018Journal article Open access
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dc.contributor.authorFreitas, C.
dc.contributor.authorCaldeira, R.
dc.contributor.authorReis, J.
dc.contributor.authorDellinger, T.
dc.date.accessioned2021-05-10T11:00:28Z
dc.date.available2021-05-10T11:00:28Z
dc.date.issued2018
dc.description.abstractMost sea turtle species spend part of, or their entire juvenile stage in pelagic habitats. A key question is how pelagic turtles exploit their environment to optimize prey intake and max imize fitness. This study combined animal telemetry with remote-sensed environmental data to quantify the drivers and patterns of foraging behavior of juvenile loggerhead sea turtles in the pelagic eastern North Atlantic. Juveniles ranged in size from 34 to 58 cm straight carapace length. First-passage time (FPT) analysis, used to quantify search effort, indicated that turtles performed area-restricted searches at nested spatial scales of 10 and 50 to 200 km. High-usage areas, as quantified by FPT, were associated with increased dive activity and weak surface currents, as well as with oceanographic features (high chlorophyll a and shallower bathymetry) thought to stimu late prey availability. Conversely, low-usage areas (i.e. transit areas) were associated with deep, probably exploratory dives, typical from Lévy movement patterns. Further interpretation of dive data indicates greater dive activity in shallow depths (0 to 10 m) during the night and during tran sit. Conversely, greater activity at intermediate depths (10 to 50 m) was observed during daytime, under strong lunar illumination and in high-usage areas, suggesting these depths are major day time foraging layers. This study clarifies the foraging ecology of sea turtles during their develop ment phase in the open sea, providing evidence that these pelagic predators can adjust their for aging strategies and effort in response to the local conditions of their dynamic environment.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationFreitas, C., Caldeira, R., Reis, J., & Dellinger, T. (2018). Foraging behavior of juvenile loggerhead sea turtles in the open ocean: from Lévy exploration to area-restricted search. Marine Ecology Progress Series, 595, 203-215. 10.3354/meps12581pt_PT
dc.identifier.doi10.3354/meps12581pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/3381
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherInter Researchpt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectArgospt_PT
dc.subjectBiologgingpt_PT
dc.subjectCaretta carettapt_PT
dc.subjectDive histogramspt_PT
dc.subjectSatellite telemetrypt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências da Vidapt_PT
dc.titleForaging behavior of juvenile loggerhead sea turtles in the open ocean: from Lévy exploration to area-restricted searchpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage215pt_PT
oaire.citation.startPage203pt_PT
oaire.citation.titleMarine Ecology Progress Seriespt_PT
oaire.citation.volume595pt_PT
person.familyNameCaldeira
person.familyNameDellinger
person.givenNameRui
person.givenNameThomas
person.identifier278940
person.identifier.ciencia-id7917-3AB5-8D9C
person.identifier.ciencia-idD21E-BADC-7807
person.identifier.orcid0000-0001-8805-3016
person.identifier.orcid0000-0002-2424-8620
person.identifier.ridJ-9829-2013
person.identifier.scopus-author-id7003731164
person.identifier.scopus-author-id7003679889
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication62abb399-1b3a-4b8c-9920-8721fe616290
relation.isAuthorOfPublication3bf4a068-5b47-46f6-becb-79eabbb56f11
relation.isAuthorOfPublication.latestForDiscovery3bf4a068-5b47-46f6-becb-79eabbb56f11

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