ALT Elham Azizi

ALT Framework overview. A competition model between 1 plant community (blue) introduced into a landscape dominated by another (green) can represent inter-community interactions via 3 mechanisms: autocatalytic nucleation, directed dispersal and resource concentration. For each mechanism the left column shows the processes shaping the transition probability (TP) toward the introduced community state of a point at the edge of the introduced patch. Autocatalytic nucleation: the TP depends on the fitness – and thus local frequency – of the introduced community. Directed dispersal: the TP depends on the colonization probability, which only increases beyond the background rate once the introduced patch exceeds a critical size. Resource concentration: the TP depends on the introduced community’s fitness, which increases with the introduced community’s frequency in the local neighborhood; however, in the larger neighborhood, individuals of the introduced community exert a negative effect