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Type: Artigo de periódico
Title: Environmental correlates of geographical variation in skull and mandible shape of the punare rat Thrichomys apereoides (Rodentia : Echimyidae)
Author: Monteiro, LR
Duarte, LC
dos Reis, SF
Abstract: The pattern of correlations between geographic-environmental variables and geometric shape descriptors for the skull and mandible of Thrichomys apereoides was studied by recently developed combinations of geometry and multivariate statistical techniques. Environmental variables were obtained for each locality: altitude, mean temperature, rainfall, human population density, and vegetation type. The three views of the skull (dorsal, lateral and ventral) and the mandible were significantly associated with a latitudinal environmental gradient along the diagonal of open areas (caatinga and cerrado) throughout the range sampled. The populations from xeric environments presented relatively larger coronoid processes, larger jugals and wider snouts (related to the activity of jaw closing muscles). A correlation of patterns of shape variation from data sets of different skull views showed that lateral skull shape is the most informative view. Further studies are necessary to separate completely the contribution of genetic and environmental components to skull and mandible shape divergence among populations of T apereoides.
Subject: Thrichomys
two-block partial least squares
geometric morphometrics
geographic variation
environmental gradient
Country: EUA
Editor: Wiley-blackwell
Citation: Journal Of Zoology. Wiley-blackwell, v. 261, n. 47, n. 57, 2003.
Rights: fechado
Identifier DOI: 10.1017/S0952836903003893
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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