Systematics Section / ASPT
Blattner, Frank R. .
Networking it out ? where genealogies outcompete phylogenetic trees.
PHYLOGENETIC analyses at the interspecific level differ markedly from those within species. While long-term reproductive isolation is thought to result ultimately in hierarchically structured, non-overlapping gene pools of different species (phylogeny), intraspecific relationships are characterized by reticulations (tokogeny) and thus are not hierarchical. Accordingly, different analytical tools were developed to account for phylogenetic vs. tokogenetic relationships. In phylogenetic analyses, branching diagrams, i.e., phylogenetic trees, describe the hierarchical patterns of ancestry among different species, while networks are mostly used to describe tokogenetic patterns. Although problems related to the transition zone between both levels of relationships were long recognized, algorithms assuming bifurcating data structures are predominantly used to analyze species level phylogenies. The analysis of many recently published chloroplast phylogenies in a multitude of plant taxa shows that these often represent taxon relationships, which might better be approached with network algorithms. Cases in which networks are superior involve long-term persisting chloroplasts, low sequence difference among OTUs, the inclusion of young species, and recent rapid radiations.[c.e.:srb]
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1 - IPK Gatersleben, Taxonomy & Evol. Biology, Gatersleben, D-06466, Germany
Presentation Type: Oral Paper:Papers for Sections
Date: Monday, July 31st, 2006
Time: 2:30 PM