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Understanding the dispersal and genetic structure of invasive insects across islands is …


Biology Articles » Biomathematics » Genetic variation in the invasive avian parasite, Philornis downsi (Diptera, Muscidae) on the Galápagos archipelago » Figures

Figures
- Genetic variation in the invasive avian parasite, Philornis downsi (Diptera, Muscidae) on the Galápagos archipelago

mcith_6785-8-13-1.jpg Figure 1 Map of Santa Cruz, Floreana, and Isabela Islands with sampling locations. Sampling sites on Santa Cruz: S1 = highlands; S2 = lowlands, Punta Estrada; S3 = lowlands, Garrapatero; S4 = lowlands, Itabaca. On Floreana and Isabela, one site each in the lowlands (L) and highlands (H) are indicated.

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mcith_6785-8-13-2.jpg Figure 2 Distribution of allele frequencies indicating a mode-shift. Bars represent the proportion of alleles found in each allele frequency class. Deviation from an L-shaped distribution is indicative of a mode-shift in allele frequency due to a recent genetic bottleneck.

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mcith_6785-8-13-3.jpg Figure 3 Estimated number of populations from STRUCTURE (a) and GENELAND (b) analyses. (a) Mean ( ± SD) probabilities of the data (LnPr [X|k]) over three replicate STRUCTURE runs plotted as a function of the putative number of clusters (k); (b) Posterior density distribution of the number of clusters estimated from GENELAND analysis in three replicates.

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mcith_6785-8-13-4.jpg Figure 4 Genetic assignment of P. downsi individuals across three islands using Bayesian clustering analysis. Two genetic clusters are identified: (a) including all individuals from Santa Cruz (n = 62) (bottom left) and Isabela (n = 9) (centre top), and (b) all individuals from Floreana Island (n = 76) (bottom right). Black dots represent independent geographic sampling points (i.e. location of bird nests). Note that two geographic sampling points on Isabela Island were within 5 m of each other and are not distinguishable.

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