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dc.contributor.CRUESPUNIVERSIDADE DE ESTADUAL DE CAMPINASpt_BR
dc.typeArtigo de periódicopt_BR
dc.titleUsing Delta13c Stable Isotopes To Quantify Individual-level Diet Variation.pt_BR
dc.contributor.authorAraújo, Márcio Spt_BR
dc.contributor.authorBolnick, Daniel Ipt_BR
dc.contributor.authorMachado, Glaucopt_BR
dc.contributor.authorGiaretta, Ariovaldo Apt_BR
dc.contributor.authordos Reis, Sérgio Fpt_BR
unicamp.authorMárcio S Araújo, Programa de Pós-Graduação em Ecologia, Instituto de Biologia, Universidade Estadual de Campinas, Caixa Postal 6109, 13083-970, Campinas, SP, Brazil. maraujo@unicamp.brpt_BR
unicamp.author.externalDaniel I Bolnick,pt
unicamp.author.externalGlauco Machado,pt
unicamp.author.externalAriovaldo A Giaretta,pt
unicamp.author.externalSérgio F dos Reis,pt
dc.subjectAnimalspt_BR
dc.subjectAnurapt_BR
dc.subjectCarbonpt_BR
dc.subjectCarbon Isotopespt_BR
dc.subjectDietpt_BR
dc.subjectEcosystempt_BR
dc.subjectFeeding Behaviorpt_BR
dc.description.abstractIndividual-level diet variation can be easily quantified by gut-content analysis. However, because gut contents are a 'snapshot' of individuals' feeding habits, such cross-sectional data can be subject to sampling error and lead one to overestimate levels of diet variation. In contrast, stable isotopes reflect an individual's long-term diet, so isotope variation among individuals can be interpreted as diet variation. Nevertheless, population isotope variances alone cannot be directly compared among populations, because they depend on both the level of diet variation and the variance of prey isotope ratios. We developed a method to convert population isotope variances into a standardized index of individual specialization (WIC/TNW) that can be compared among populations, or to gut-content variation. We applied this method to diet and carbon isotope data of four species of frogs of the Brazilian savannah. Isotopes showed that gut contents provided a reliable measure of diet variation in three populations, but greatly overestimated diet variation in another population. Our method is sensitive to incomplete sampling of the prey and to among-individual variance in fractionation. Therefore, thorough sampling of prey and estimates of fractionation variance are desirable. Otherwise, the method is straightforward and provides a new tool for quantifying individual-level diet variation in natural populations that combines both gut-content and isotope data.en
dc.relation.ispartofOecologiapt_BR
dc.relation.ispartofabbreviationOecologiapt_BR
dc.date.issued2007-Julpt_BR
dc.identifier.citationOecologia. v. 152, n. 4, p. 643-54, 2007-Jul.pt_BR
dc.language.isoengpt_BR
dc.description.volume152pt_BR
dc.description.firstpage643-54pt_BR
dc.rightsfechadopt_BR
dc.sourcePubMedpt_BR
dc.identifier.issn0029-8549pt_BR
dc.identifier.doi10.1007/s00442-007-0687-1pt_BR
dc.identifier.urlhttp://www.ncbi.nlm.nih.gov/pubmed/17356809pt_BR
dc.date.available2015-11-27T13:09:53Z-
dc.date.accessioned2015-11-27T13:09:53Z-
dc.description.provenanceMade available in DSpace on 2015-11-27T13:09:53Z (GMT). No. of bitstreams: 1 pmed_17356809.pdf: 449353 bytes, checksum: 152784572717bff5cb44a356c18687fd (MD5) Previous issue date: 2007en
dc.identifier.urihttp://repositorio.unicamp.br/jspui/handle/REPOSIP/197201-
dc.identifier.idPubmed17356809pt_BR
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