TY - JOUR
T1 - Phylogenetic relationships of South American lizards of the genus Stenocercus (Squamata: Iguania)
T2 - A new approach using a general mixture model for gene sequence data
AU - Torres-Carvajal, Omar
AU - Schulte, James A.
AU - Cadle, John E.
PY - 2006/4
Y1 - 2006/4
N2 - The South American iguanian lizard genus Stenocercus includes 54 species occurring mostly in the Andes and adjacent lowland areas from northern Venezuela and Colombia to central Argentina at elevations of 0-4000 m. Small taxon or character sampling has characterized all phylogenetic analyses of Stenocercus, which has long been recognized as sister taxon to the Tropidurus Group. In this study, we use mtDNA sequence data to perform phylogenetic analyses that include 32 species of Stenocercus and 12 outgroup taxa. Monophyly of this genus is strongly supported by maximum parsimony and Bayesian analyses. Evolutionary relationships within Stenocercus are further analyzed with a Bayesian implementation of a general mixture model, which accommodates variability in the pattern of evolution across sites. These analyses indicate a basal split of Stenocercus into two clades, one of which receives very strong statistical support. In addition, we test previous hypotheses using non-parametric and parametric statistical methods, and provide a phylogenetic classification for Stenocercus.
AB - The South American iguanian lizard genus Stenocercus includes 54 species occurring mostly in the Andes and adjacent lowland areas from northern Venezuela and Colombia to central Argentina at elevations of 0-4000 m. Small taxon or character sampling has characterized all phylogenetic analyses of Stenocercus, which has long been recognized as sister taxon to the Tropidurus Group. In this study, we use mtDNA sequence data to perform phylogenetic analyses that include 32 species of Stenocercus and 12 outgroup taxa. Monophyly of this genus is strongly supported by maximum parsimony and Bayesian analyses. Evolutionary relationships within Stenocercus are further analyzed with a Bayesian implementation of a general mixture model, which accommodates variability in the pattern of evolution across sites. These analyses indicate a basal split of Stenocercus into two clades, one of which receives very strong statistical support. In addition, we test previous hypotheses using non-parametric and parametric statistical methods, and provide a phylogenetic classification for Stenocercus.
KW - Bayesian analysis
KW - Iguania
KW - Maximum parsimony
KW - Mixture models
KW - Phylogenetic classification
KW - Stenocercus
UR - http://www.scopus.com/inward/record.url?scp=33645007368&partnerID=8YFLogxK
U2 - 10.1016/j.ympev.2005.09.007
DO - 10.1016/j.ympev.2005.09.007
M3 - Article
C2 - 16269252
AN - SCOPUS:33645007368
SN - 1055-7903
VL - 39
SP - 171
EP - 185
JO - Molecular Phylogenetics and Evolution
JF - Molecular Phylogenetics and Evolution
IS - 1
ER -