Article
Genetic diversity of wild populations of the grey short-tailed opossum, Monodelphis domestica (Didelphimorphia: Didelphidae), in Brazilian landscapes
Registro en:
CARAMASCHI, Fabiana P. et al. Genetic diversity of wild populations of the grey short-tailed opossum, Monodelphis domestica (Didelphimorphia: Didelphidae), in Brazilian landscapes. Biological Journal of the Linnean Society, v.104, n.2, p.251-263, Oct. 2011.
0024-4066
1095-8312
Autor
Caramaschi, Fabiana P.
Nascimento, Fabrícia F.
Cerqueira, Rui
Bonvicino, Cibele R.
Resumen
The characterization of the different taxa of the highly diverse genus Monodelphis is poorly understood, as is the
case of their distribution. Historically, taxonomic studies of Monodelphis have been restricted to a few or single
species, whereas molecular approaches have been used for estimating phylogenetic relationships between species.
We carried out phylogenetic analyses of 14 Monodelphis species, including Monodelphis domestica, based on
cytochrome b mitochondrial DNA sequences. Forty-five complete (1149 bp) sequences of this gene were obtained
from 39 specimens of M. domestica collected in 23 localities of the Brazilian Cerrado, Pantanal, and Caatinga
morphoclimatic domains; one of Monodelphis umbristriata, two of Monodelphis americana, and two of Monodelphis
dimidiata. A total of 72 haplotypes were analyzed, 48 only in M. domestica. Analyses were carried out in
conjunction with 46 other sequences retrieved from GenBank, including M. domestica, Monodelphis brevicaudata,
Monodelphis glirina, Monodelphis emiliae, Monodelphis peruviana, Monodelphis osgoodi, Monodelphis handleyi,
Monodelphis kunsi, Monodelphis americana, Monodelphis dimidiata, Monodelphis iheringi, Monodelphis reigi, and
Monodelphis adusta, with six other different didelphid species used as outgroups. Maximum likelihood and
Bayesian inference were similar in depicting phylogenetic relationships of different Monodelphis taxa. Two clades
of M. domestica were defined on the basis of these results. Genetic distance estimates ranged from 3.2% to 6.2%
between these clades of M. domestica. Population analyses were carried out to infer the likely demographic
scenarios and the relationship between M. domestica haplotypes. Median-joining and spatial analyses showed two
populations related to different morphoclimatic domains (Cerrado/Pantanal and Caatinga). These results indicate
a population structure in M. domestica and the possibility that this taxon might represent a species complex. 2030-01-01