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Systematic Biology 2006 55(1):46-56; doi:10.1080/10635150500431197
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© 2006 Society of Systematic Biologists

Hybrids in Real Time

Mihaela Baroni, Charles Semple and Mike Steel

Biomathematics Research Centre, Department of Mathematics and Statistics, University of Canterbury Christchurch, New Zealand; E-mail: m.steel{at}math.canterbury.ac.nz

Edited by Olaf Bininda-Emonds: Associate Editor


  Abstract

We describe some new and recent results that allow for the analysis and representation of reticulate evolution by nontree networks. In particular, we (1) present a simple result to show that, despite the presence of reticulation, there is always a well-defined underlying tree that corresponds to those parts of life that do not have a history of reticulation; (2) describe and apply new theory for determining the smallest number of hybridization events required to explain conflicting gene trees; and (3) present a new algorithm to determine whether an arbitrary rooted network can be realized by contemporaneous reticulation events. We illustrate these results with examples.

Keywords: Directed acyclic graph; reticulate evolution; hybrid species; subtree prune and regraft

Received March 29, 2005; Revised June 17, 2005; Accepted August 11, 2005
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