Can Novel Genetic Analyses Help to Identify Lowdispersal Marine
Can novel genetic analyses help to identify low-dispersal marine invasive species? Peter R. Teske1,2, Jonathan Sandoval-Castillo1, Jonathan M. Waters3 & Luciano B. Beheregaray1 1Molecular Ecology Laboratory, School of Biological Sciences, Flinders University, Adelaide, South Australia 5001, Australia 2Department of Zoology, University of Johannesburg, Auckland Park, 2006, Johannesburg, South Africa 3Department of Zoology, University of Otago, PO Box 56, Dunedin, New Zealand Keywords Abstract Ascidian, biological invasion, coalescent theory, founder effect, genetic bottleneck, Genetic methods can be a powerful tool to resolve the native versus introduced microsatellites, sea squirt. status of populations whose taxonomy and biogeography are poorly understood. The genetic study of introduced species is presently dominated by analyses that Correspondence identify signatures of recent colonization by means of summary statistics. Unfor- Luciano B. Beheregaray tunately, such approaches cannot be used in low-dispersal species, in which Molecular Ecology Laboratory, School of recently established populations originating from elsewhere in the species’ native Biological Sciences, Flinders University, range also experience periods of low population size because they are founded by Adelaide, SA 5001, Australia. Tel: +61 8 8201 5243; Fax: +61 8 8201 3015; few individuals. We tested whether coalescent-based molecular analyses that pro- E-mail: Luciano.beheregaray@flinders.edu.au vide detailed information about demographic history supported the hypothesis that a sea squirt whose distribution is centered on Tasmania was recently intro- Funding Information duced to mainland Australia and New Zealand through human activities. Meth- This study was funded by the Australian ods comparing trends in population size (Bayesian Skyline Plots and Research Council (DP110101275 to Approximate Bayesian Computation) were no more informative than summary Beheregaray, Moller€ & Waters).
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