Extended Data Figure 2 : Illustration of the concept of classical percolation theory.

From: Global patterns of tropical forest fragmentation

Extended Data Figure 2

a, A landscape occupied by 90% randomly and independently distributed forest cells (green, p = 0.9) is dominated by one large cluster. b, For values of p larger than the percolation threshold (p = 0.6 > 0.59) there exists a continuous path from two opposite-side borders (yellow path within the spanning cluster). c, Below the percolation threshold (here, p = 0.55 < 0.59) larger clusters emerge but no spanning cluster can be detected. d, A landscape occupied by 20% forest shows small unconnected clusters. Landscape size is 20 × 20 cells.