how to do a TRACK?

Tue Feb 5 21:06:10 CST 2002

"Croizat developed the idea of drawing tracks between the areas comprising
the disjunct distributions of different organisms (or closely related
organisms). A track is a line connecting known areas of distribution for a
taxon. When many organisms had similar disjunct distributions and so similar
tracks, Croizat called this a generalized track. Croizat inferred that the
tracks represented pathways used by organisms that now had disjunct
distributions ..."
      As far as Croizart´s panbiogeography was concerned, I would like to
ask: how to draw a single track? Do we use the minimun spanning tree
concept?
Please depict the concepts.
                                            Thanks,
                                                    Ronaldo

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