Effects of character weighting and species sampling on phylogeny reconstruction: a case study based on DNA sequence data in cetaceans.
Genetics
; 144(4): 1817-33, 1996 Dec.
Article
em En
| MEDLINE
| ID: mdl-8978067
ABSTRACT
Different phylogenetic analyses of the same genetic data set can yield conflicting results, depending on the choice of parameter settings and included taxa. This is particularly true in studies involving data sets where levels of homoplasy are high and likely to obscure the phylogenetic signal. Filtering of this phylogenetic noise can be attempted, with varying degrees of success, by using different weighting schemes and ingroup/outgroup choices, but it can be difficult to decide objectively which approach is best. Using a cytochrome b data set from cetaceans and artiodactyls, we examined the effects of a suite of parameter settings on the outcome of phylogenetic analyses. We tested 2968 combinations among the seven parameters that most often vary among phylogenetic studies. It is our contention that this sensitivity analysis identifies portions of the multidimensional parameter space where phylogenetic signal is most reliably recovered, and simple rules are given to guide the choice of settings. Portions of this data set have been used in previous studies with conflicting results, namely the monophyly vs. paraphyly of one of the two major recognized cetacean suborders, the toothed whales. This analysis strongly supports the sister relationship between sperm whales and baleen whales.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Filogenia
/
DNA Mitocondrial
/
Cetáceos
/
Análise de Sequência de DNA
Limite:
Animals
Idioma:
En
Revista:
Genetics
Ano de publicação:
1996
Tipo de documento:
Article
País de afiliação:
Bélgica