Fig. 1.
Additivity of genetic drift can result in equivalent genetic differentiation (FST) under temporal structure and population divergence. (A and B) Thirty individuals are sampled from two populations (15 individuals from each population) that diverged at a given time in the past. In (A), both samples are taken at the present, and in (B), one of the samples is taken at 0.5 × 2Ne generations before present and the other sample is taken at present. (C) Thirty individuals are sampled from two discrete time points (15 individuals from each time point) in the history of a continuous population. In all three scenarios, the total time that passes between each sample is T = 2Ne generations. The 15 individuals in each sample are illustrated as a series of red circles or a series of blue circles.