Do population size bottlenecks reduce evolutionary potential?

Richard Frankham

Corresponding Author

Key Centre for Biodiversity and Bioresources, School of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia

Tel: (612) 9850‐8186; Fax (612) 9850‐8245; E‐mail:

rfrankha@RNA.bio.mq.edu.au

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Kelly Lees

Key Centre for Biodiversity and Bioresources, School of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia

NSW Department of Agriculture, Orange, NSW 2800, Australia; Margaret E. Montgomery, School of Biological Sciences, University of New South Wales, NSW 2052, Australia.Search for more papers by this author
Margaret E. Montgomery

Key Centre for Biodiversity and Bioresources, School of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia

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Phillip R. England

Key Centre for Biodiversity and Bioresources, School of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia

Department of Biological Sciences, University of Wollongong, NSW 2522, Australia.Search for more papers by this author
Edwin H. Lowe

Key Centre for Biodiversity and Bioresources, School of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia

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David A. Briscoe

Key Centre for Biodiversity and Bioresources, School of Biological Sciences, Macquarie University, Sydney, NSW 2109, Australia

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First published: 28 February 2006
Cited by: 118

Abstract

Single locus neutralist models predict that population size bottlenecks will reduce genetic variation and increase inbreeding, thereby reducing evolutionary potential. However, experimental evaluations of the effects of bottlenecks on quantitative genetic variation do not always follow predictions, especially for characters related to reproductive fitness. Populations of Drosophila melanogaster were subjected to population bottlenecks of a single pair for one or three generations, and their ability to tolerate increasing concentrations of NaCl was compared with those of their outbred base populations, and related highly inbred lines. Bottlenecked populations became extinct at significantly lower concentrations of NaCl than their non‐bottlenecked base populations. Population bottlenecks should be avoided in managing species of conservation concern.

Number of times cited: 118

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