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Bulletin de la Societe Geologique de France; January 2009; v. 180; no. 1; p. 39-43; DOI: 10.2113/gssgfbull.180.1.39
© 2009 Societe Geologique de France
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Biogeography and the molecular dating game: a futile revival of phenetics?

Gareth Nelson1 and Pauline Y. Ladiges1

1 School of Botany, The University of Melbourne, Vic. 3010, Australia. - E-mail: g.nelson{at}botany.unimelb.edu.au

In molecular dating, branch lengths are considered parameters that may be estimated by counting similarities and differences in DNA sequences. Long and short branches imply long and short time spans, which might appear informative additions when imposed on a tree that is otherwise cladistic. Recent attempts to apply molecular dating to southern hemisphere biogeography (Nothofagus, Adansonia) seem only another "excursion into futility," as was the fate of phenetic systematics [H.H. Ross, 1964]. Some conceptual matters are clarified with reference to the experimental approach of Claude Bernard (1813–1878).

Key Words: Molecular dating • Phenetics • Cladistics • Nothofagus • Adansonia • Biogeography • Progression rule • Gondwana • Claude Bernard






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