Karyological analysis of Proechimys cuvieri and Proechimys guyannensis (Rodentia, Echimyidae) from central Amazon

• Autor(a) principal: Silva, Carlos Eduardo Faresin e
• Data de Publicação: 2012
• Outros Autores: Eler, Eduardo Schmidt, Silva, Maria Nazareth Ferreira da, Feldberg, Eliana
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional do INPA
• Texto Completo: https://repositorio.inpa.gov.br/handle/1/14954
• topic: Brasil; Chromosome Analysis; Chromosome Number; Chromosome Structure; Diploidy; Evolutionary Homology; Genetic Association; Genetic Marker; Geographic Distribution; Hydropower; Karyotyping; Evolution, Molecular; Molecular Genetics; Nonhuman; Proechimys Cuvieri; Proechimys Guyannensis; Rodent; Structure Analysis; Taxonomy; Echimyidae; Proechimys; Proechimys Cuvieri; Rattus; Rodentia

The aim was to characterize the karyotype of rodents of the genus Proechimys from three localities in the central Brazilian Amazon, in the search for new markers that might shed light on our understanding of the taxonomy and evolutionary history of this taxon. Two karyotypes were found, viz., 2n = 28, FN = 46 in individuals from the NRSP (Cuieiras River) and REMAN (Manaus), and 2n = 46, FN = 50 in individuals from the Balbina Hydroelectric Plant. While individuals with the karyotype with 2n = 28 chromosomes were morphologically associated with Proechimys cuvieri, their karyotype shared similarities with those of the same diploid number in two other regions. Although three karyotypes are described for Proechimys cuvieri, no geographic distribution pattern that defined a cline could be identified. Based on the morphological examination of voucher specimens and additional results from molecular analysis, the karyotype with 2n = 46 and FN = 50 could be associated with P. guyannensis. © 2012, Sociedade Brasileira de Genética.