Figure 3

Proportion π A of propagules from source A in a 2-D space. Proportion of propagules from source A as a function of position (x, y) in a 2-dimensional space for three dispersal kernels:top, exponential kernel; bottom left, Gaussian kernel; bottom right, power-law kernel with a = 4. The mean distance travelled is the same for the three kernels and equals 2 m (parameter α equals respectively 2.26, 1 and 1). The sources A and B are located in (-1,0) and (1,0). The lighter greys stand for larger proportions of propagules from A, such as indicated by the colorbar.