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Compensatory growth in oceanic loggerhead sea turtles: response to a stochastic environment

2003Journal article Open access
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dc.contributor.authorBjorndal, Karen A.
dc.contributor.authorBolten, Alan B.
dc.contributor.authorDellinger, Thomas
dc.contributor.authorDelgado, Cláudia
dc.contributor.authorMartins, Helen R.
dc.date.accessioned2021-05-21T14:11:20Z
dc.date.available2021-05-21T14:11:20Z
dc.date.issued2003
dc.description.abstractCompensatory growth (CG, accelerated growth that may occur when an organism that has grown at a reduced rate as a result of suboptimal environmental conditions is exposed to better conditions) is considered an adaptation to variable en vironments. Although documented thoroughly under captive conditions, CG has rarely been studied in wild populations. In their first years of life, oceanic-stage loggerhead sea turtles (Caretta caretta) have relatively little control over their geographic position or movements and thus have an extremely stochastic lifestyle with great variation in food availability and temperature. This environmental variation results in variable growth rates. We evaluate somatic growth functions of oceanic-stage loggerheads from the eastern Atlantic based on skeletochronology that allowed us to assign age and cohort to each individual. We demonstrate CG in these turtles based on three different analytical approaches: changes in coefficients of variation in size-at-age, generalized additive model regression analyses of somatic growth, and linear regression of age-specific growth rates. As a result of CG, variation in size-at-age in these juvenile loggerheads is substantially reduced. Thus, size is a better predictor of age than expected based on variation in growth rates. CG decreases with age, apparently as loggerheads gain greater control over their movements. In addition, we have evaluated for the first time in wild sea turtles the time-dependent nature of somatic growth by distinguishing among age, year, and cohort effects using a mixed longitudinal sampling design with assigned-age individuals. Age and year had significant effects on growth rates, but there was no significant cohort effect. Our results address critical gaps in knowledge of the demog raphy of this endangered species.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationBjorndal, K. A., Bolten, A. B., Dellinger, T., Delgado, C., & Martins, H. R. (2003). Compensatory growth in oceanic loggerhead sea turtles: response to a stochastic environment. Ecology, 84(5), 1237-1249.pt_PT
dc.identifier.doi10.1890/0012-9658(2003)084[1237:CGIOLS]2.0.CO;2pt_PT
dc.identifier.urihttp://hdl.handle.net/10400.13/3422
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherEcological Society of Americapt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/pt_PT
dc.subjectAge–year–cohort effectspt_PT
dc.subjectCaretta carettapt_PT
dc.subjectCompensatory growthpt_PT
dc.subjectDemographypt_PT
dc.subjectMarine turtlept_PT
dc.subjectSkeletochronologypt_PT
dc.subjectSomatic growthpt_PT
dc.subjectTime-varying parameterspt_PT
dc.subject.pt_PT
dc.subjectFaculdade de Ciências da Vidapt_PT
dc.titleCompensatory growth in oceanic loggerhead sea turtles: response to a stochastic environmentpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1249pt_PT
oaire.citation.issue5pt_PT
oaire.citation.startPage1237pt_PT
oaire.citation.titleEcologypt_PT
oaire.citation.volume84pt_PT
person.familyNameDellinger
person.givenNameThomas
person.identifier.ciencia-idD21E-BADC-7807
person.identifier.orcid0000-0002-2424-8620
person.identifier.scopus-author-id7003679889
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication3bf4a068-5b47-46f6-becb-79eabbb56f11
relation.isAuthorOfPublication.latestForDiscovery3bf4a068-5b47-46f6-becb-79eabbb56f11

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