LisBeth: New cladistics for phylogenetics and biogeography |
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Authors: | René Zaragüeta Bagils Visotheary Ung Anaïs Grand Régine Vignes-Lebbe Nathanaël Cao Jacques Ducasse |
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Institution: | 1. UMR 7207 CNRS MNHN UPMC, Centre de Recherche sur la Paléobiodiversité et les Paléoenvironnements (CR2P), 57, rue Cuvier, CP48, 75005 Paris, France;2. Laboratoire Informatique et Systématique (LIS), UPMC Université Paris06, 4, place Jussieu, 75005 Paris, France;3. Laboratoire Paléobotanique et Paléoécologie, UPMC Université Paris06, 4, place Jussieu, 75005 Paris, France |
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Abstract: | Within phylogenetics, two methods are known to implement cladistics: parsimony or maximum parsimony (MP) and three-item analysis (3ia). Despite the lack of suitable software, 3ia is occasionally used in systematic, and more regularly, in historical biogeography. Here, we present LisBeth, the first and only phylogenetic/biogeographic program freely available that uses the 3ia approach and offer some insights into its theoretical propositions. LisBeth does not rely on the conventional taxon/character matrix. Instead, characters are represented as rooted trees. LisBeth performs 3ia analyses based on maximum congruence of three-item statements and calculates the intersection tree (which differs from usual consensus). In biogeography, it applies the transparent method to handle widespread taxa and implements paralogy-free subtree analysis to remove redundant distributions. For the sake of interoperability, LisBeth may import/export characters from/to matrix in NEXUS format, allowing comparison with other cladistic programs. LisBeth also imports phylogenetic characters from Xper2 knowledge bases. |
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