Figure 2.

Conditional dispersal strategies. (a) For density-dependent emigration, the emigration rate depends on the relation of population size and carrying capacity. This dependency can be linear (Φ_emi=1), concave (Φ_emi<1) or convex (Φ_emi>1). Emigration rates never exceed 0.5. (b) For density-dependent immigration, the transfer probability to any one possible destination patch depends upon its population density relative to the three other potential patch destinations (four-neighbourhood dispersal). This dependency can be linear (Φ_immi=1), concave (Φ_immi>1) or convex (Φ_immi<1).