Ontogenetic and sexual variation in cranial characters of Aegialomys Xanthaeolus (Thomas, 1894)(Cricetidae: Sigmodontinae) from Ecuador and Peru

Autor(es)

Joyce R. Prado ; Alexandre R. Percequillo ^[2]

• Tipo de documento: Artigo Científico
• Fonte: Papéis Avulsos de Zoologia (São Paulo); v. 51, n. 9, p. 155-177, 2011-00-00.

Resumo

Aegialomys xanthaeolus (Cricetidae: Sigmodontinae) inhabits the arid montane areas of western Ecuador and Peru, and higher elevations in the upper Marañón valley in northern Peru. Some researchers have included this species in broader systematic assessments over the years, but there are no comprehensive studies focusing on intraspecific variation. There are several sources of intraspecific phenotypic variation, including sexual dimorphism and age. These sources may confound the assessment of similarity/dissimilarity among populations, therefore it is essential that non-geographic variation is evaluated before studies on geographical variation and species delimitation are carried out. Here we summarize existing information regarding the geographical distribution of A. xanthaeolus and evaluate variation related to sex and age. We analyzed 19 traditional cranio-dental measurements taken from specimens housed in scientific collections, and organized the collecting localities of specimens examined in a gazetteer and plotted them on a distribution map. Uni and multivariate statistical analyses allow us to assert that age variation was significant, as age classes 3, 4 and 5 can be pooled for the subsequent analysis of geographic variation and that sexual dimorphism is not a consistent component of variation within this species in the continental samples, when considering samples from the same locality, or localities close to each other. (AU)

• Processo FAPESP: 09/16009-1 - Sistemática, evolução e diversificação da subfamília Sigmodontinae na América do Sul: a tribo Oryzomyini
• Beneficiário: Alexandre Reis Percequillo
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 98/12273-0 - Revisão das espécies sul-americanas do gênero Oryzomys Baird, 1858 (Rodentia, Sigmodontinae)
• Beneficiário: Alexandre Reis Percequillo
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 98/05075-7 - Evolução e conservação sistemáticas de mamíferos no Leste brasileiro
• Beneficiário: Mario de Vivo
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 09/03547-5 - Revisão taxonômica de aegialomys (weksler, percequillo & voss, 2006) (cricetidae: sigmodontinae)
• Beneficiário: Joyce Rodrigues Do Prado
• Modalidade de apoio: Bolsas no Brasil - Mestrado