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: With a posterior modal estimation of 3, the number of founders (Nb) starting each new infestation seems to be very low (Median = 5.27, HPD90 = 2.09, 13.1; see Table 1). There was limited information regarding effective sizes of current and source populations, as well as for the divergence time from the source population (Ne, Ns and t3, respectively, see Fig. 3 and Table 1). The time since founding (t2) was low, suggesting that the sampled infestations were detected early (Median = 3.13, HPD90 = 1.75, 9.36). Whilst the mutation rate parameter was not well estimated, additional simulations showed that adjusting the prior on this parameter did not have a strong effect on the other parameters of interest and resulted in an estimate of mutation rate within the range of the original prior (Table S6 and Fig. S7, 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.