Species-Area Relationship

S = cAz — the power law governing species richness on islands

SAR Parameters

S = 2.0 × A0.26
Islands—
Largest Island—
Total Species—
Taxon presets (typical z):

Map Controls

Click map to add islands. Drag to move.

MacArthur-Wilson Theory:
Equilibrium where immigration rate equals extinction rate. Larger islands → lower extinction; closer islands → higher immigration.