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Genetic structure and dispersal patterns of the invasive psocid Liposcelis decolor (Pearman) in Australian grain storage systems

Published online by Cambridge University Press:  02 February 2010

K.M. Mikac  and
N.N. FitzSimmons
K.M. Mikac*
Affiliation:
Institute for Applied Ecology, University of Canberra, Bruce, ACT, 2601, Australia
N.N. FitzSimmons
Affiliation:
Institute for Applied Ecology, University of Canberra, Bruce, ACT, 2601, Australia
*
*Author for correspondence Fax: +61 2 4221 4366 E-mail: kmikac@uow.edu.au
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Abstract

Microsatellite markers were used to investigate the genetic structure among invasive L. decolor populations from Australia and a single international population from Kansas, USA to determine patterns of dispersal. Six variable microsatellites displayed an average of 2.5–4.2 alleles per locus per population. Observed (HO) heterozygosity ranged from 0.12–0.65 per locus within populations; but, in 13 of 36 tests, HO was less than expected. Despite low levels of allelic diversity, genetic structure estimated as θ was significant for all pairwise comparisons between populations (θ=0.05–0.23). Due to suspected null alleles at four loci, ENA (excluding null alleles) corrected FST estimates were calculated overall and for pairwise population comparisons. The ENA-corrected FST values (0.02–0.10) revealed significant overall genetic structure, but none of the pairwise values were significantly different from zero. A Mantel test of isolation by distance indicated no relationship between genetic structure and geographic distance among all populations (r2=0.12, P=0.18) and for Australian populations only (r2=0.19, P=0.44), suggesting that IBD does not describe the pattern of gene flow among populations. This study supports a hypothesis of long distance dispersal by L. decolor at moderate to potentially high levels.

Keywords

microsatellitesgene flowPsocopteraLiposcelididaeLiposcelisnull allelesWahlund effect
Type
Research Paper
Information
Bulletin of Entomological Research , Volume 100 , Issue 5 , October 2010 , pp. 521 - 527
Copyright
Copyright © Cambridge University Press 2010

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