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Molecular Panbiogeography of the Tropics$
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Michael Heads

Print publication date: 2012

Print ISBN-13: 9780520271968

Published to California Scholarship Online: September 2012

DOI: 10.1525/california/9780520271968.001.0001

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Evolution in Space

Evolution in Space

(p.1) 1 Evolution in Space
Molecular Panbiogeography of the Tropics

Michael Heads

University of California Press

The main processes in biogeography are phylogenetic differentiation by vicariance, range expansion by normal ecological dispersal, and, in some cases, sympatric differentiation. Chance dispersal and differentiation by founder dispersal can be rejected. The location of a basal clade or a paraphyletic basal group have been thought to represent a center of origin, but this cannot be assumed. The significance of extinction is discussed with reference to the subgenera of Nothofagus, a tree that has an excellent fossil record. Groups tend to go extinct in localities where they are less diverse to begin with. The relationship between ecology and biogeography is discussed, with reference to metapopulations and weeds.

Keywords:   basal clade, paraphyletic basal group, center of origin, vicariance, dispersal, founder, range expansion, sympatric differentiation

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