Easy as ABC

Determining the whens and hows of biological invasions using genetic data is a major goal of molecular ecology. One such tool is approximate Bayesian computation (ABC) which is being used for inferring invasion histories.

© www.keepcalm-o-matic.co.uk

© www.keepcalm-o-matic.co.uk

In a new paper in Heredity, Benazzo et al. (2015) present a largely unexplored model of multiple introductions from a single source.

Their scenario posits one invasive population that has established at a single site. After a few generations, a new wave of introduced individuals arrive.

The novel aspect of this model is that the second wave originates from the same source as the first; most models of multiple introductions consider a second wave originating from a geographically and genetically different source than the first.

Using simulated microsatellite data, the power of ABC to distinguish between single and multiple introductions from the same source and under a variety of different demographic parameters was evaluated.

[They] demonstrated that it is often possible, using the inferential power of ABC and under a range of realistic demographic conditions, to distinguish between one or two waves of invasion from the same source, and to infer some important parameters.

References

A Benazzo, S Ghirotto, S T Vilaça and S Hoban (2015) Using ABC and microsatellite data to detect multiple introductions of invasive species from a single source. Heredity doi: 10.1038/hdy.2015.38

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About Stacy Krueger-Hadfield

I am a marine evolutionary ecologist interested in the impacts of seascapes and complex life cycles on marine population dynamics. I use natural history, manipulative field experiments and population genetic and genomic approaches with algal and invertebrate models in temperate rocky shores,estuaries and the open ocean.
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