Campus Units

Entomology

Document Type

Article

Publication Version

Published Version

Publication Date

3-1997

Journal or Book Title

Biological Control

Volume

8

Issue

3

First Page

207

Last Page

214

DOI

10.1006/bcon.1997.0508

Abstract

Gene flow was studied inHarmonia axyridis(Pallas) (Coleoptera: Coccinellidae), an exotic, arboreal ladybeetle predator that recently spread rapidly throughout North America. A survey of isozyme polymorphisms showed 30 of 52 resolved putative loci were polymorphic (58%), and the mean heterozygosity was 16.75 ± 2.98% among all loci and 26.31 ± 4.37% at only the polymorphic loci. The mean number of alleles at the 52 loci was 2.01 ± 1.97. Gene frequencies were estimated in populations from Georgia, Virginia, Delaware, Rhode Island, Arkansas, Illinois, Iowa, and Oregon and differed significantly (P < 0.02) at 11 of 16 loci. Three of 16 loci (Fbp, Est-1, Tre) were not in Hardy–Weinberg equilibrium in all populations and are not included in theFstatistics. Random mating was indicated within populations (FIS = −0.005 ± 0.014) but not among populations (FST = 0.025 ± 0.005). According to Wright's island model,FSTestimates the average number of reproducing immigrants to be equivalent to ca. 10 beetles per population per generation. Thus there was a measure of genetic differentiation caused by drift, but this differentiation was small with respect to the large geographical distances among the sampled populations. The genetic data suggest that the founding North American population(s) was substanti

Comments

This article is from Biological Control 8 (1997); 207, doi: 10.1006/bcon.1997.0508.

Rights

Works produced by employees of the U.S. Government as part of their official duties are not copyrighted within the U.S. The content of this document is not copyrighted.

Language

en

File Format

application/pdf

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