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Article Dans Une Revue Molecular Ecology Année : 2008

Population genetics reveals origin and number of founders in a biological invasion

Résumé

Propagule pressure is considered the main determinant of success of biological invasions: when a large number of individuals are introduced into an area, the species is more likely to establish and become invasive. Nevertheless, precise data on propagule pressure exist only for a small sample of invasive species, usually voluntarily introduced. We studied the invasion of the American bullfrog, Rana catesbeiana, into Europe, a species that is considered a major cause of decline for native amphibians. For this major invader with scarce historical data, we used population genetics data (a partial sequence of the mitochondrial cytochrome b gene) to infer the invasion history and to estimate the number of founders of non-native populations. Based on differences between populations, at least six independent introductions from the native range occurred in Europe, followed by secondary translocations. Genetic diversity was strongly reduced in non-native populations, indicating a very strong bottleneck during colonization. We used simulations to estimate the precise number of founders and found that most non-native populations derive from less than six females. This capability of invasion from a very small number of propagules challenges usual management strategies; species with such ability should be identified at an early stage of introduction.
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Dates et versions

halsde-00281686 , version 1 (23-05-2008)

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G. F. Ficetola, A. Bonin, C. Miaud. Population genetics reveals origin and number of founders in a biological invasion. Molecular Ecology, 2008, 17 (3), pp.773-782. ⟨10.1111/j.1365-294X.2007.03622.x⟩. ⟨halsde-00281686⟩
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