INVESTIGADORES
MORANDO mariana
congresos y reuniones científicas
Título:
PHYLOGEOGRAPHY AND MORPHOLOGICAL PATTERNS OF LIZARDS FROM THE LINEOMACULATUS GROUP (SQUAMATA, IGUANIA, LIOLAEMINI, LIOLAEMUS)
Autor/es:
BREITMAN, M.F.; PARRA, M.; AVILA, L.J.; SITES, J. W. JR.; MORANDO, M.
Lugar:
Curitiba
Reunión:
Congreso; IX Congreso Latinoamericano de Herpetologia; 2011
Institución organizadora:
Sociedad Brasilera de Herpetologia-Instituto Neotropical-Museo de Historia Natural
Resumen:
The Patagonian region of southern South America was subjected to a complex geological history, including the Miocene uplift of the Andes, followed by volcanism, marine introgressions, and extreme climatic oscillations during Pleistocene glaciation–deglaciation cycles. Species distributions probably changed in a dynamic way and bottlenecks, range expansions and gene flow in secondary contact areas played a role in shaping today’s genetic patterns and distributions. Phylogeographic methods allow the study of these patterns and inferences about processes shaping them. The genus Liolaemus is one of the most ecologically diverse and species-rich genera of lizards, with more than 228 recognized species. The Liolaemus lineomaculatus section (subgenus Eulaemus) is a widely-distributed group of Patagonian lizards including 18 described species representing the most southerly distributed Liolaemus. The section includes four groups: kingii+archeforus, somuncurae, magellanicus and lineomaculatus, with the lineomaculatus group including four species (L. lineomaculatus, L. silvanae, L. hatcheri and L. kolengh) and two species under description. The distribution of the lineomaculatus group encompasses much of Argentina’s Santa Cruz and Chubut provinces and the west parts of Río Negro and Neuquén provinces. This study presents phylogeographic patterns of the L. lineomaculatus group and relates them to potential causal Miocene-to-Pleistocene events. Two hundred individuals from 55 localities covering the full geographic range of the group were analyzed. We sequenced two mitochondrial markers (cytb and 12S) and the nuclear KIF24 gene. Species relationships were inferred and hypotheses for different demographic processes were tested using Bayesian phylogenetic methods, networks and analyses of spatial genetic structure. Eighteen morphometric characters, 12 meristic characters, and 94 qualitative characters (84 on squamation and 10 on body patterns) were measured from each lizard and analyzed with several complementary methods: univariate analysis of variance (ANOVA), principal component analysis (PCA), discriminant function analysis (DFA) and non-parametric multivariate analysis of variance (NPMANOVA). We integrate results from these independent sources of evidence and discussed them in an evolutionary context.