Figure 3. Interactive effects of spatially correlated disturbance and intraspecific competition (γ = 0, 0.002, 0.004···0.01) on species extinction thresholds at fixed periodicity T = 200, considering both local (a) and global (b) dispersal.

Similar to Fig. 1, two principal aspects of disturbance are varied: disturbance extent ρ_d ∈ [0, 1] and spatial correlation q_d/d ∈ . The boundary line separating species persistence (left region) from extinction (right region) shifts with the intraspecific competition coefficient (γ). Invalid region: see equation (3). Other parameters: see Fig. 1.