Chapter 11 Univariate drift and stabilizing selection

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Figure 11.3 Simulations of replicate lineages evolving about a stationary intermediate optimum, theta. Upper panel – A single lineage trait mean in a population of finite size evolving according to an Ornstein-Ulenbeck (OU) process for 400 generations. Stabilizing selection pulls the trait mean towards the optimum. The trait mean tends to wander away from the optimum due to drift. 95% confidence limits for the diversification of lineage trait means are shown as blue curves. Lower panel – The lineage trait means of 10 replicate populations evolving according to the same process.