Data from: Is local selection so widespread in river organisms? Fractal geometry of river networks leads to high bias in outlier detection
Lemaire, Christophe (2012), Data from: Is local selection so widespread in river organisms? Fractal geometry of river networks leads to high bias in outlier detection, Dryad, Dataset, https://doi.org/10.5061/dryad.8m30f
Identifying local adaptation is crucial in conservation biology in order to define ecotypes and establish management guidelines. Local adaptation is often inferred from the detection of loci showing a high differentiation between populations, the so-called FST outliers. Methods of detection of loci under selection are reputed to be robust in most spatial population models. However, using simulations we showed that FST outlier tests provided a high rate of false positives (up to 60%) in fractal environments such as river networks. Surprisingly, the number of sampled demes was correlated with parameters of population genetic structure, such as the variance of FSTs, and hence strongly influenced the rate of outliers. This unappreciated property of river networks therefore needs to be accounted for in genetic studies on adaptation and conservation of river organisms.