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Bulletin de la Societe Geologique de France; January 2009; v. 180; no. 1; p. 13-15; DOI: 10.2113/gssgfbull.180.1.13
© 2009 Societe Geologique de France
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Three-item analysis and parsimony, intersection tree and strict consensus: a biogeographical example

Nathanaël Cao1, Estelle Bourdon2, Meydi El Azawi3 and René Zaragüeta Bagils3

1 CNRS UMR 5143, MNHN Département Histoire de la Terre, 75005 Paris, France. ncao{at}snv.jussieu.fr
2 CNRS UMR 7179, Collège de France, UPMC Univ. Paris VI, 75005 Paris, France
3 CNRS UMR 5143, UPMC Univ. Paris VI, MNHN Département Histoire de la Terre, 75005 Paris, France. Tel: 01 40 79 80 53. Email: rene.zaragueta-bagils{at}upmc.fr

Using a biogeographical example, we show that the strict consensus of parsimony programs fails to summarize the information present in the initial hypotheses of homology. The intersection tree used in the three-item analysis program Nelson05 maximizes the compatibility of the three-item statements deduced from the source trees. The 3ia solution is more precise than the parsimony one because it accurately summarizes the initial information.

Key Words: Three-item analysis • Intersection tree • Historical biogeography • Strict consensus • Parsimony






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