Table 1.

Simulated scenarios with parameter values

	Local species	Invasive species
Scenario	K	Km	K	Km
NC1	50	10	50	10
NC2	500	10	500	10
NC3	500	100	500	100
NC4	50	10	500	100
NC5	500	100	50	10

They represent the expansion of invasive organisms in an area occupied by a local species without interspecific competition (Currat et al. 2008). K is the carrying capacity and Km is the number of emigrants sent to neighbor demes when carrying capacity is reached. The intrinsic growth rate (r) is fixed to 0.5 in all scenarios. Scenarios incorporating interspecific competition are shown in Table S1.