Human-facilitated metapopulation dynamics in an emerging pest species, Cimex lectularius.
Bottom Line: Founder events often result in drastic reductions in diversity and an increased influence of genetic drift.ABC results suggest a common origin of all founders of a given subpopulation and that the numbers of colonists were low, implying that even a single mated female is enough to found a new infestation successfully.These patterns of colonization are close to the predictions of the propagule pool model, where all founders originate from the same parental infestation.
Affiliation: Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK; Department of Biosciences, University of Helsinki, PO Box 65 (Viikinkaari 1), FI-00014, Helsinki, Finland.Show MeSH
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Mentions: In total, 63 individuals from 13 infestations across London were genotyped at 21 loci. Due to the low sample sizes per infestation (three to seven individuals), HWE could not be rejected. Within infestations, effective allele numbers ranged from 1.28 to 2.10 across all loci (Table 3) and were therefore comparable to more thoroughly sampled infestations (see above and Booth et al. 2012; Saenz et al. 2012). Within infestations, mean kinship was high (0.566 ± 0.030), and across infestations, FIS was 0.084 (95% CI = −0.052 to 0.226). The global FST value across all 13 infestations showed significant population differentiation (FST = 0.592, SE = 0.026, P < 0.001). However, we found no significant pattern of isolation by distance (Fig. 2, slope = 0.013 ± 0.016). DAPC analysis further supported high differentiation between infestations with a defined genetic cluster for each infestation (Fig. S3, Supporting information).
Affiliation: Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield, S10 2TN, UK; Department of Biosciences, University of Helsinki, PO Box 65 (Viikinkaari 1), FI-00014, Helsinki, Finland.