INVESTIGADORES
CATALANO Santiago Andres
congresos y reuniones científicas
Título:
Phylogenetic Analysis of 41 Empirical Landmark Datasets
Autor/es:
CATALANO, SANTIAGO ANDRÉS; TORRES, AMBROSIO
Lugar:
Nueva York
Reunión:
Encuentro; XXXV Meeting de la Sociedad Willi Hennig; 2015
Resumen:
In order to evaluate the utility of landmark data to infer phylogenetic relationships and to determine how different variables affect that inference, we collected and analyzed 41 published landmark datasets. Phylogenetic analyses were conducted considering 5 different methodological approaches: parsimony analysis of landmark (static and dynamic), parsimony with x,y,z coordinates as independent continuous characters and UPGMA and Neighbor Joining from simple Procrustes distances. The results were evaluated by calculating the SPR distances between the resulting tree and reference trees obtained from alternative sources of evidence. For datasets with more than two configurations, we analyzed the effect of the number of landmark configurations in the topology of the resulting trees. The results indicate that the trees derived from landmarks presented in general marked topological differences with the reference trees (average SPR distance of approx. 0.5). In addition, the different methods produce very similar results in terms of topological similarity with the reference tree. The inclusion of a higher number of landmark configurations clearly improves the results in 6 out of 8 datasets analyzed. The present study suggests that the main limitation in the phylogenetic analysis of landmark data is not methodological (as has generally been presented), but related to the lack of enough evidence (landmark configurations).