Eur. J. Entomol. 102 (3): 469-474, 2005 | DOI: 10.14411/eje.2005.067
Comparative genetic studies of native and introduced Coccinellidae in North America
- 1 Department of Entomology, Iowa State University, Ames, IA 50011, USA
- 2 Department of Entomology, University of Kentucky, S-225 Agricultural Science Center North, Lexington, KY 40546-0091, USA
During the past four decades, several species of aphidophagous Coccinellidae became established in North America, including Coccinella septempunctata, Harmonia axyridis, Hippodamia variegata, and Propylea quatuordecimpunctata. After their establishment, unknown circumstances favoured a rapid increase in population densities and distribution of H. axyridis and C. septempunctata at localities hundreds and thousands of kilometers from their release sites. Propylea quatuordecimpunctata and Hippodamia variegata have spread more slowly after becoming established in northeastern North America. Comparative studies based upon allozyme variation in these four introduced species and in six native North American species of ladybird beetles revealed no significant differences in genetic diversities. Genetic variation, assessed by allelic diversity and heterozygosity, was uncorrelated with the establishment and spread of these predatory species in North America. All ladybirds studied show a remarkable degree of dispersion with little detectable population subdivision.
Keywords: Coccinellidae, allozyme variation, genetic diversity, colonizing species, biological control
Received: May 2, 2005; Revised: June 3, 2005; Accepted: June 3, 2005; Published: August 15, 2005 Show citation
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