INVESTIGADORES
CHIAPPERO Marina Beatriz
artículos
Título:
Evolutionary relationships among eight species of South American phyllotine rodents (Rodentia: Muridae) based on allozymic data
Autor/es:
CHIAPPERO, M.B.; DE SOUSA, G.B.; GARDENAL, C.N.
Revista:
JOURNAL OF ZOOLOGICAL SYSTEMATICS AND EVOLUTIONARY RESEARCH
Editorial:
WILEY-BLACKWELL PUBLISHING, INC
Referencias:
Lugar: Londres; Año: 2002 vol. 40 p. 1 - 7
ISSN:
0947-5745
Resumen:
Rodents of
the tribe Phyllotini represent one of the main radiations of South American
Sigmodontini. Phylogenetic relationships among species of this highly diversified
group are poorly known. In this paper we analyse evolutionary relationships
among eight phyllotine species belonging to the genera Calomys, Graomys,
Phyllotis and Eligmodontia, on the basis of allozymic polymorphisms. Most of
the differences among
species were in allele
frequencies and not of allele class. Neighbour-joining and maximum likelihood
methods place P. xanthopygus in the same group as E. typus and G. griseoflavus,
in agreement with results obtained by several authors on the basis of
morphological characters. Parsimony analysis of 0-9 coded data suggest that the
genus Calomys is paraphyletic, but with a low bootstrap support. In the tree
based on genetic distance data, the genus also appears as paraphyletic. The
maximum likelihood method yields a tree whereCalomysis monophyletic, but this
phylogeny is supported by only two out of 78 alleles analysed.Calomys
hummelincki and C. venustus occupy a basal position among Calomys species. Calomys
musculinus and C. lepidus are the most closely related species of the genus,
with C. laucha as sister to them. These relationships are strongly supported by
bootstrap percentages.