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Absence of evidence for isolation by distance in an expanding cane toad ( Bufo marinus ) population: an individual-based analysis of microsatellite genotypes

Abstract : The cane toad (Bufo marinus) was introduced in 1935 in Australia, where it spread rapidly. We have tested for isolation by distance by analysing at a local geographical scale a continuous population using seven microsatellite markers and an individual‐based method. The matrix of pairwise individual differentiation was not significantly correlated with that of geographical distance. Regression analyses gave a low positive slope of 0.00072 (all individuals) or a negative slope of 0.0017 (individuals with a distance higher than the previously estimated mean dispersal distance). The absence of evidence for isolation by distance favours the hypothesis that the substantial differentiation and autocorrelation previously observed at enzyme loci, mainly results from discontinuities in the colonization process with founder effects occurring at the time of the establishment of new populations.
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https://hal.inrae.fr/hal-02929761
Déposant : Raphael Leblois <>
Soumis le : jeudi 3 septembre 2020 - 17:33:37
Dernière modification le : mercredi 23 septembre 2020 - 15:44:12

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Raphaël Leblois, François Rousset, Dani Tikel, Craig Moritz, Arnaud Estoup. Absence of evidence for isolation by distance in an expanding cane toad ( Bufo marinus ) population: an individual-based analysis of microsatellite genotypes. Molecular Ecology, Wiley, 2000, 9 (11), pp.1905-1909. ⟨10.1046/j.1365-294x.2000.01091.x⟩. ⟨hal-02929761⟩

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