Identidade taxonômica e variação geográfica de Oligoryzomys BANGS, 1900 (Rodentia, Cricetidae) do sul de Minas Gerais

• Ano de defesa: 2011
• Autor(a) principal: Stumpp, Rodolfo German Antonelli Vidal
• Orientador(a): Giudice, Gisele Mendes Lessa Del
• Banca de defesa: Gonçalves, Pablo Rodrigues , Romano, Pedro Seyferth Ribeiro
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso embargado
• Idioma: por
• Instituição de defesa: Universidade Federal de Viçosa
• Programa de Pós-Graduação: Mestrado em Biologia Animal
• Departamento: Biologia e Manejo animal
• País: BR
• Palavras-chave em Português: Roedores; Análise morfométrica; Variação geográfica; Taxonomia
• Palavras-chave em Inglês: Rodents; Craniometry; Morphology; Taxonomy; Evolution
• Área do conhecimento CNPq: CNPQ::CIENCIAS BIOLOGICAS::ZOOLOGIA::TAXONOMIA DOS GRUPOS RECENTES
• Link de acesso: http://locus.ufv.br/handle/123456789/2261

Rodents of the genus Oligoryzomys are widely distributed in Brazil, occurring in virtually all states. Nine species are recognized for the country; however, the distance between them is quite difficult due to great morphological similarity between them. In addition, many species are sympatric in some areas, further hindering their separation. One of this area is Zona da Mata of Minas Gerais, inserted in the Atlantic Forest domain. Two species of the genus are found in this area, O. flavescens and O. nigripes. Thus, the objective was to characterize morphologically sympatric populations of these species, comparing them spatially and temporally. Thirty measurements of the cranium were taken for the morphometric analysis. Descriptive and multivariate statistics analysis were performed to visualize the morphometric patterns. These two species, primarily O. nigripes, show great intrainterpopulation variation, both quantitative and qualitative, not just in the cranium, but also in the hair color. Many of these variations were age effects. Cranial differences among O. flavescens and O. nigripes were minimal, but in some aspects the second specie was bigger. Spatial variations existed, but apparently were not affected by altitude or distance between populations. Time variations also existed, and the specimens collected 40 years ago are bigger than those collected less than 10 years ago. These results demonstrate the difficulty that exists in the characterization of these species indicating that there should be more studies taxonomic using various tools in order to define and better understand the species of this genus.