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Can fluctuating asymmetry be used to detect inbreeding and loss of genetic diversity in endangered populations?

Published online by Cambridge University Press:  01 May 2000

Dean M. Gilligan ,
Lynn M. Woodworth ,
Margaret E. Montgomery ,
Roderick K. Nurthen ,
David A. Briscoe  and
Richard Frankham
Dean M. Gilligan
Affiliation:
Key Centre for Biodiversity and Bioresources, Department of Biological Sciences, Macquarie University, NSW 2109, Australia NSW Fisheries, Port Stephens Research Centre, Taylors Beach Road, Taylors Beach, NSW 2135, Australia.
Lynn M. Woodworth
Affiliation:
Key Centre for Biodiversity and Bioresources, Department of Biological Sciences, Macquarie University, NSW 2109, Australia
Margaret E. Montgomery
Affiliation:
Key Centre for Biodiversity and Bioresources, Department of Biological Sciences, Macquarie University, NSW 2109, Australia School of Biological Science, University of New South Wales, NSW 2052, Australia.
Roderick K. Nurthen
Affiliation:
Key Centre for Biodiversity and Bioresources, Department of Biological Sciences, Macquarie University, NSW 2109, Australia
David A. Briscoe
Affiliation:
Key Centre for Biodiversity and Bioresources, Department of Biological Sciences, Macquarie University, NSW 2109, Australia
Richard Frankham
Affiliation:
Key Centre for Biodiversity and Bioresources, Department of Biological Sciences, Macquarie University, NSW 2109, Australia
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Abstract

Fluctuating asymmetry (FA), a measure of developmental stability, has been proposed as a simple technique for identifying populations suffering from inbreeding and a loss of genetic diversity. However, there is controversy regarding the relationship between FA and both allozyme heterozygosity and pedigree inbreeding coefficients (F). FA of sternopleural bristle number in Drosophila melanogaster was measured in populations maintained at effective sizes of 25 (8 replicates), 50 (6), 100 (4), 250 (3) and 500 (2) for 50 generations (inbreeding coefficients of 0.05—0.71). FA was calculated from the same data set using three different indices (FA1, FA5 and FA6). There was no significant relationship of FA with pedigree inbreeding coefficients for any of the three indices. The relationship between FA and allozyme heterozygosity was non-significant for indices FA5 and FA6 (the more powerful indices) and only significant for FA1. A second comparison of highly inbred (F ≈ 1) populations with their outbred base population showed significantly greater FA in the inbred populations only when analysed with FA6. Analysis of the same data using FA1 and FA5 showed non-significant relationships in the opposite direction. If a relationship between FA and genetic diversity does exist, it is weak and inconsistent. Consequently, our results do not support the use of FA as a monitoring tool to detect inbreeding or loss of genetic diversity.

Type
Research Article
Information
Animal Conservation forum , Volume 3 , Issue 2 , May 2000 , pp. 97 - 104
Copyright
© 2000 The Zoological Society of London

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