Fig. 2: Possible evolutionary outcomes in this environment.
From: Ecological disruptive selection acting on quantitative loci can drive sympatric speciation
In an environment where the strength of sexual selection is fixed (=5), the evolutionary trajectory of the trait relevant for fitness (beak size) is studied, by varying the strength of disruptive selection. When the strength of disruptive selection is a intermediate (=3.85), the population adapts to split into two distinct groups; b low (=1.667), the population does not split, and c high (=5), the population adapts to move to one of the two niches.
