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Tracing the geographic origin of the cosmopolitan parthenogenetic insect pest Liposcelis bostrychophila (Psocoptera: Liposcelididae)

Published online by Cambridge University Press:  09 March 2007

K.M. Mikac  and
G.M. Clarke
K.M. Mikac*
Affiliation:
CSIRO Division of Entomology, GPO Box 1700, Acton, 2601 ACT, Australia Institute for Applied Ecology, University of Canberra, Bruce, 2617 ACT, Australia
G.M. Clarke
Affiliation:
CSIRO Division of Entomology, GPO Box 1700, Acton, 2601 ACT, Australia
*
*Fax: +61 +2 +6246 4202 E-mail: [email protected]
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Abstract

The randomly amplified polymorphic DNA technique was used to trace the geographic origin of Liposcelis bostrychophila Badonnel populations in Australia from unknown geographic sources internationally. Haplotype (or clonal) diversity was high, with 474 unique haplotypes found from 616 individuals genotyped. Gene diversity estimates (0.10–0.28) and percent polymorphic loci (38.1–88.1%) were moderate to high for most populations. This resulted in genetic distance estimates that ranged from 0.04 to 0.26 and were significantly different for most pairwise population combinations. GST values for all populations were also moderate (0.04–0.54) and again were significantly different for most pairwise population comparisons. Analysis of molecular variance revealed that the majority of variation was apportioned among individuals within populations regardless of the level at which they were grouped. Gene flow (Nm) was mostly low for all pairwise populations comparisons with an average Nm = 1.8. A non-significant negative correlation between genetic distance and geographic distance was found for worldwide populations. In contrast, within Australian populations a significant positive correlation between genetic distance and geographic distance was detected. Genetic relationships explored using unweighted pair group method analysis and non-metric multidimensional scaling indicated a mixed pattern of genetic similarities among all populations. Multiple introductions, from a wide range of international source populations, have obscured the ability to accurately determine the geographic origin of L. bostrychophila in Australia.

Keywords

Liposcelis bostrychophilaAustraliagrain storagegene flowgeographic origin
Type
Research Article
Information
Bulletin of Entomological Research , Volume 96 , Issue 5 , October 2006 , pp. 523 - 530
Copyright
Copyright © Cambridge University Press 2006

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