Figure 7.—
Probability of fixation with a source-sink population in a heterogeneous environment uncorrelated with demography. The model and parameters here are the same as in Figure 3 of Whitlock (2003) except that selection in one habitat was s1 = 0.01 and in the other equally common habitat was s2 = −0.005. There were 100 demes each with 100 individuals, and the immigration rate into the sources was 0.2, while for the sinks the immigration rate was 0.25. Sink populations contributed to the migrant pool in proportion to the value on the x-axis.