Genetic variation in the invasive avian parasite, <Emphasis Type="Italic">Philornis downsi</Emphasis> (Diptera,Muscidae) on the Galápagos archipelago |
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| Authors: | Rachael Y Dudaniec Michael G Gardner Steve Donnellan Sonia Kleindorfer |
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| Institution: | (1) School of Biological Sciences, Flinders University GPO Box 2100, Adelaide, South Australia, 5001, Australia;(2) Centre for Evolutionary Biology and Biodiversity, University of Adelaide, South Australia, 5005, Australia |
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| Abstract: | Background Understanding the dispersal and genetic structure of invasive insects across islands is important for designing management
plans that are appropriate at spatial and temporal scales. For invasive parasites, population dynamics are largely determined
by the distribution and density of their host species. The introduced parasitic fly, Philornis downsi, parasitises nestlings of endemic birds on all major islands of the Galápagos archipelago. The fly's high mortality and fitness
impacts are of conservation concern for vulnerable and declining species of Darwin's finches. Using microsatellite data in
Bayesian clustering and landscape genetic analyses, we examine gene flow and dispersal in P. downsi between three islands and across habitats (highlands, lowlands) and examine for the presence of population bottlenecks. We
also examine variation at the mitochondrial gene CO1 across islands to establish if cryptic species were present. |
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