Genetic Bottlenecks in Time and Space: Reconstructing invasions from contemporary and historical collections

Eleanor Dormontt, Michael Gardner, Martin F. Breed, James Rodger, Peter Prentis, Andrew Lowe

    Research output: Contribution to journalArticle

    8 Citations (Scopus)

    Abstract

    Herbarium accession data offer a useful historical botanical perspective and have been used to track the spread of plant invasions through time and space. Nevertheless, few studies have utilised this resource for genetic analysis to reconstruct a more complete picture of historical invasion dynamics, including the occurrence of separate introduction events. In this study, we combined nuclear and chloroplast microsatellite analyses of contemporary and historical collections of Senecio madagascariensis, a globally invasive weed first introduced to Australia c. 1918 from its native South Africa. Analysis of nuclear microsatellites, together with temporal spread data and simulations of herbarium voucher sampling, revealed distinct introductions to south-eastern Australia and mid-eastern Australia. Genetic diversity of the south-eastern invasive population was lower than in the native range, but higher than in the mid-eastern invasion. In the invasive range, despite its low resolution, our chloroplast microsatellite data revealed the occurrence of new haplotypes over time, probably as the result of subsequent introduction(s) to Australia from the native range during the latter half of the 20thcentury. Our work demonstrates how molecular studies of contemporary and historical field collections can be combined to reconstruct a more complete picture of the invasion history of introduced taxa. Further, our study indicates that a survey of contemporary samples only (as undertaken for the majority of invasive species studies) would be insufficient to identify potential source populations and occurrence of multiple introductions.

    Original languageEnglish
    Article numbere106874
    Pages (from-to)e106874
    Number of pages11
    JournalPLoS One
    Volume9
    Issue number9
    DOIs
    Publication statusPublished - 2014

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