Annals of the Entomological Society of America (1996) 89, 410-419

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E.S. Krafsur, P. Nariboli and J.J. Obrycki (1996)
Gene flow and diversity at allozyme loci in the twospotted lady beetle (Coleoptera: Coccinellidae)
Annals of the Entomological Society of America 89 (3), 410-419
Abstract: High levels of genetic variation in biological control agents are thought to be necessary to ensure their successful establishment and geographical spread. Gene diversity was studied in F2 twospotted lady beetle, Adalia bipunctata (L.), descended from specimens collected in Uzbekistan and from beetles collected in Oregon, Iowa, and Lake Michigan at Chicago, IL. Twenty-four of 39 resolved putative loci were polymorphic and the mean observed heterozygosity was 22.7 ± 4.4% at the polymorphic loci. The average expected heterozygosity was 24.7 ± 4.9% at the polymorphic loci and 15.2 ± 3.3% at all loci. The mean number of alleles at the 39 loci was 1.9 ± 1.0, and the mean effective number of alleles was 1.3 ± 0.5. These are substantial levels of diversity. Significant departures from random mating were detected within (FIS = 0.068 ± 0.042) and among (FST = 0.070 ± 0.012) the North American populations but matings were random within populations when problematic loci were excluded. Analysis of gene frequencies at 5 loci in 4 British and a French population showed the same magnitude of gene flow as the 3 North American populations. The fixation index between Iowa and Uzbekistan ladybirds was FST = 0.428 ± 0.128. Our data do not support an Old World origin for North American A. bipunctata in historical times.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Elliot S. Krafsur

Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution


Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.


Adalia bipunctata (predator) France
Adalia bipunctata (predator) United Kingdom
Adalia bipunctata (predator) Uzbekistan
Adalia bipunctata (predator) U.S.A. (NW)
Adalia bipunctata (predator) U.S.A. (mid N)