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Abstract Detail

Systematics Section/ASPT

Charboneau, Joseph [1], Sanderson, Michael [1].

Terraces in phylogenetic tree space in a supermatrix phylogeny of the inverted repeat-lacking clade of legumes (Fabaceae).

The inverted repeat-lacking clade (IRLC) of papilionoid legumes comprises over 4,300 species in about 50 genera, including many economically important species in the genera Cicer, Lens, Medicago, Pisum, and Trifolium as well as the most species-rich angiosperm genus, Astragalus. We constructed a phylogeny of the clade from a supermatrix with about 1,500 species from 47 genera incompletely populated with GenBank sequence data from three loci: matK, ITS1/5.8S/ITS2, and the trnL intron. Missing data from supermatrix phylogenies can lead to the phenomenon of terraces in phylogenetic tree space, in which the best tree identified by phylogenetics software may have an equal optimality score as even millions of other trees. These trees are said to exist on a terrace in tree space together. We used a heuristic and bootstrapping approach to identify a small subset of species that could be removed from the supermatrix so that the new most optimal tree found is on a substantially smaller terrace. The resulting phylogeny of the IRLC will allow an investigation of where and why net diversification rates may have increased within this large clade.

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1 - University of Arizona, Ecology and Evolutionary Biology, Tucson, AZ, 85721, USA

phylogenetic methods

Presentation Type: Oral Paper:Papers for Sections
Session: 5
Location: Salon 9/The Shaw Conference Centre
Date: Monday, July 27th, 2015
Time: 11:30 AM
Number: 5014
Abstract ID:1307
Candidate for Awards:None

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