INVESTIGADORES
MORANDO Mariana
congresos y reuniones científicas
Título:
ACCURACY AND PRECISION OF SPECIES TREES: EFFECTS OF LOCUS, INDIVIDUAL, AND BASE-PAIR SAMPLING ON INFERENCE OF SPECIES TREES OF THE Liolaemus darwinii GROUP (SQUAMATA, LIOLAEMIDAE)
Autor/es:
CARMARGO, A.; AVILA, L.J.; MORANDO, M.; SITES, JR. J. W.
Lugar:
San Carlos de Bariloche
Reunión:
Congreso; XII Congreso Argentino de Herpetología; 2011
Institución organizadora:
Sociedad Argentina de Herpetologia-Universidad Nacional del Comahue
Resumen:
Molecular phylogenetics has entered a new era in which species trees are estimated from gene trees using methods that accommodate for discordance with the species tree. Empirical evaluation of species trees is necessary to assess the performance (i.e., accuracy and precision) of these methods with real data. We analyzed 20 loci for 16 species of lizards of the Liolaemus darwinii species group to reconstruct a species tree with *BEAST with the full data set and with different sampling strategies of loci, individuals, and sequence lengths. We found an increase in the accuracy and precision of species trees with the number of loci, but decreases in accuracy when using only one individual per species or 25% of the full sequence length. In addition, locus ´informativeness´ was an important factor when using a few loci, but it became increasingly irrelevant with additional loci. Our empirical results and previous simulation studies suggest that there is an optimal range of sampling effort for a given speciation history and information content of the data. Future studies should be directed towards further assessment of other factors that can impact performance of species trees, including gene flow and missing data.