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Marine Ecology Progress Series

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MEPS 270:163-172 (2004)  -  doi:10.3354/meps270163

Population genetic structure of the perlemoen Haliotis midae in South Africa: evidence of range expansion and founder events

B. S. Evans1,2,4,*, N. A. Sweijd3, R. C. K. Bowie3,5, P. A. Cook3, N. G. Elliott2

1School of Zoology, University of Tasmania, GPO Box 252-05, Hobart, Tasmania 7001, Australia
2CSIRO Marine Research, GPO Box 1538, Hobart, Tasmania 7001, Australia
3Department of Zoology, University of Cape Town, Private Bag, Rondebosch 7701, Cape Town, South Africa
4Present address: School of Marine Biology and Aquaculture, James Cook University, Townsville, Queensland 4811, Australia
5Present address: Department of Zoology, University of Stellenbosch, Private Bag XI, Matieland 7602, South Africa

ABSTRACT: Genetic diversity in Haliotis midae, a highly valued and heavily exploited marine gastropod, was assessed using 3 marker types across samples from the species¹ range in South Africa. Variation was compared at 7 allozyme loci, 2 regions of mitochondrial DNA and 3 microsatellite loci. We conclude that populations of H. midae on either side of Cape Agulhas represent 2 independent reproductive stocks. The area of transition between the stocks coincides with oceanographic features of the region. Evidence from all 3 types of genetic marker indicates an isolated introduction event to the east of Cape Agulhas, and subsequent range expansion in an easterly direction. The disparity between allozyme data and the other 2 forms is seen as further evidence for the presence of balancing selection at allozyme loci.

KEY WORDS: Allozymes · Mitochondrial DNA · Microsatellites · Abalone

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