Chapter

Evolution in Space, Time, and Form: Beyond Centers of Origin, Dispersal, and Adaptation

Michael Heads

in Molecular Panbiogeography of the Tropics

Published by University of California Press

Published in print January 2012 | ISBN: 9780520271968
Published online September 2012 | e-ISBN: 9780520951808 | DOI: http://dx.doi.org/10.1525/california/9780520271968.003.0010
Evolution in Space, Time, and Form: Beyond Centers of Origin, Dispersal, and Adaptation

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This chapter extends the discussion past the factors of space and time to include evolution in form. The critique of the center of origin-adaptation-dispersal (CODA) model that is presented here finds parallels in work on genome evolution. The modern synthesis idea that whole-genome evolution relies on “extrinsic needs” can be replaced by a model of evolution determined primarily by intrinsic, genetic factors. Nonadaptive changes have been proposed to explain changes in genome complexity, in gene regulatory networks, and in the genetic code. Processes such as biased gene conversion can lead to results that mimic those of selection. At the ecological level, community structure has been attributed to local factors such as competition. Instead, the causes may be nonadaptive and caused by phylogeny at regional, biogeographic scales.

Keywords: CODA model; genome evolution; nonadaptive evolution; biased gene conversion; community

Chapter.  7477 words. 

Subjects: Evolutionary Biology

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