Figure 1
From: Isolation-by-distance in landscapes: considerations for landscape genetics

Two hypothetical FST–distance relationships modified from Hutchison and Templeton (1999). The case-I relationship (left) is characterized by a monotonically increasing FST and scatter with interdeme geographic distance. The same can be observed in a case-IV relationship (right) up to a certain geographic distance, after which no relationship between FST and interdeme distance is detectable anymore.