Ergebnis 7 von 16
Sie befinden Sich nicht im Netzwerk der Universität Paderborn. Der Zugriff auf elektronische Ressourcen ist gegebenenfalls nur via VPN oder Shibboleth (DFN-AAI) möglich. mehr Informationen...

Details

Autor(en) / Beteiligte
Titel
Phylogenetic support values are not necessarily informative: the case of the Serialia hypothesis (a mollusk phylogeny)
Ist Teil von
  • Frontiers in zoology, 2009-06, Vol.6 (1), p.12-12
Ort / Verlag
England: BioMed Central Ltd
Erscheinungsjahr
2009
Link zum Volltext
Quelle
EZB Electronic Journals Library
Beschreibungen/Notizen
  • Molecular phylogenies are being published increasingly and many biologists rely on the most recent topologies. However, different phylogenetic trees often contain conflicting results and contradict significant background data. Not knowing how reliable traditional knowledge is, a crucial question concerns the quality of newly produced molecular data. The information content of DNA alignments is rarely discussed, as quality statements are mostly restricted to the statistical support of clades. Here we present a case study of a recently published mollusk phylogeny that contains surprising groupings, based on five genes and 108 species, and we apply new or rarely used tools for the analysis of the information content of alignments and for the filtering of noise (masking of random-like alignment regions, split decomposition, phylogenetic networks, quartet mapping). The data are very fragmentary and contain contaminations. We show that that signal-like patterns in the data set are conflicting and partly not distinct and that the reported strong support for a "rather surprising result" (monoplacophorans and chitons form a monophylum Serialia) does not exist at the level of primary homologies. Split-decomposition, quartet mapping and neighbornet analyses reveal conflicting nucleotide patterns and lack of distinct phylogenetic signal for the deeper phylogeny of mollusks. Even though currently a majority of molecular phylogenies are being justified with reference to the 'statistical' support of clades in tree topologies, this confidence seems to be unfounded. Contradictions between phylogenies based on different analyses are already a strong indication of unnoticed pitfalls. The use of tree-independent tools for exploratory analyses of data quality is highly recommended. Concerning the new mollusk phylogeny more convincing evidence is needed.
Sprache
Englisch
Identifikatoren
ISSN: 1742-9994
eISSN: 1742-9994
DOI: 10.1186/1742-9994-6-12
Titel-ID: cdi_doaj_primary_oai_doaj_org_article_e431557ebde449b7afc13f739f2605b3

Weiterführende Literatur

Empfehlungen zum selben Thema automatisch vorgeschlagen von bX