Figure 4

Model of colonisation under different incubation temperatures. The model shows the variation of the annual number of nesting females (Nt) during the colonisation process at different incubation temperatures and propagule pressure rates. Four different propagule pressure rates (Pr) were modelled, (a) 1 sporadic nest per a hundred years (Pr = 0.01), (b) 1 sporadic nest per ten years (Pr = 0.1), (c) 1 sporadic nest per year (Pr = 1) and (d) 10 sporadic nest per year (Pr = 10).