title: Genetic structure and dispersal patterns of the invasive psocid Liposcelis decolor (Pearman) in Australian grain storage systems.
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 theta was significant for all pairwise comparisons between populations (theta=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.
authors.affiliation: Institute for Applied Ecology, University of Canberra, Bruce, ACT, 2601, Australia. kmikac@uow.edu.au
authors.forename: K M
authors.initials: KM
authors.lastname: Mikac
authors.forename: N N
authors.initials: NN
authors.lastname: Fitzsimmons
mesh_terms: D000483:Alleles; D000818:Animals; D001315:Australia; D002523:Edible Grain; D051456:Gene Flow; D014644:Genetic Variation; D005843:Geography; D007313:Insecta / Q000235:genetics* / Q000502:physiology; D007615:Kansas; D015810:Linkage Disequilibrium; D018895:Microsatellite Repeats