Assessing Relative Age And Age Structure In Natural Populations Of Bolomys Lasiurus (rodentia: Sigmodontinae) In Northeastern Brazil

dc.creatorDe Oliveira J.A.
dc.creatorStrauss R.E.
dc.creatorDos Reis S.F.
dc.date1998
dc.date2015-06-30T15:08:03Z
dc.date2015-11-26T15:21:15Z
dc.date2015-06-30T15:08:03Z
dc.date2015-11-26T15:21:15Z
dc.date.accessioned2018-03-28T22:30:46Z
dc.date.available2018-03-28T22:30:46Z
dc.identifier
dc.identifierJournal Of Mammalogy. , v. 79, n. 4, p. 1170 - 1183, 1998.
dc.identifier222372
dc.identifier
dc.identifierhttp://www.scopus.com/inward/record.url?eid=2-s2.0-0042426047&partnerID=40&md5=a9d9ac7f4f1f55c9fd9383906377d696
dc.identifierhttp://www.repositorio.unicamp.br/handle/REPOSIP/100813
dc.identifierhttp://repositorio.unicamp.br/jspui/handle/REPOSIP/100813
dc.identifier2-s2.0-0042426047
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1260179
dc.descriptionWear-induced changes in the crown topography of molariform teeth have been widely used to index relative age in rodents. To assess the consistency of molar-wear estimates in natural populations of a sigmodont rodent (Bolomys lasiurus), we investigated the association between molar wear and two other age-dependent craniodental characters: degree of exposure of molar roots from the alveoli and ossification of the basisphenoid-basioccipital suture. We compared magnitudes of Spearman correlation coefficients among states of these characters in samples cross-classified by vegetation, season, and locality, under the null hypothesis of high correlation in the absence of differential environmental effects on molar wear. A bootstrap procedure was used to derive empirical sampling distributions of the age-index correlations and, thus, to establish realistic confidence intervals. We then employed a multivariate procedure to reduce subjectivity of classifying combinations of indices of age into age classes. Using a principal component analysis of the correlation matrix of craniodental indices, variation expressed among indices was summarized as a multivariate age factor. An objective ordering of sets of indices of age (the various combinations of tooth-wear, molar-root exposure, and suture-ossification conditions observed among all samples) was provided by projecting individuals onto the first principal component. The method revealed age-frequency differences between wet- and dry-season samples from northeastern Brazil, ostensibly due to the occurrence of a reproductive peak at the beginning of the rainy season, and predicted a maximum life span for B. lasiurus of ca. 1-1.5 years in the wild.
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dc.languageen
dc.publisher
dc.relationJournal of Mammalogy
dc.rightsfechado
dc.sourceScopus
dc.titleAssessing Relative Age And Age Structure In Natural Populations Of Bolomys Lasiurus (rodentia: Sigmodontinae) In Northeastern Brazil
dc.typeArtículos de revistas


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