Data/hora: 03/06/2024 17:56:38

Provedor de dados: | 76
País: | Brazil
Título: | Molecular phylogenies, chromosomes and dispersion in Brazilian akodontines (Rodentia, Sigmodontinae)
Autores: | Barros,Maria Claudene; Sampaio,Iracilda; Schneider,Horacio; Langguth,Alfredo.
Data: | 2009-12-01
Ano: | 2009
Palavras-chave: | Brazilian akodontines; Chromosome evolution; Biogeography; Molecular phylogeny.
Resumo: | A new molecular phylogeny for akodontine rodents from Brazil was proposed. The phylogenetic tree was enriched with the area of occurrence and with information on the karyotype of the samples. Based on this enriched tree, and with a described methodology, hypotheses were proposed on the karyotype and area of occurrence of the ancestors of each Clade. Thus it was possible to discuss hypotheses on chromosome evolution of the group, and on dispersion events from the "area of original differentiation" of akodontines in the Andes. Chromosome evolution started with high diploid numbers (2n=52) and showed a tendency to reduction (until 2n=14 in more recent clades). Independent side-branches of the tree showed 2n reduction and in one case the 2n increased. At least four dispersion events from the Andes down to South-eastern Brazil were proposed. The results should suggest the direction of new studies on comparative karyology.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212009000400006
Editor: | Museu de Ciências Naturais
Relação: | 10.1590/S0073-47212009000400006
Formato: | text/html
Fonte: | Iheringia. Série Zoologia  v.99 n.4 2009
Fonte: | info:eu-repo/semantics/openAccess