// multi-utility computation suite · offline · instant · precise
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sci.species-area-MacArthur-Wilson Calculator
Calculates species richness from area using the MacArthur-Wilson species-area relationship S = cA^z with z ≈ 0.25 for habitat fragments. A 10× reduction in habitat area reduces species richness by 44% (at z = 0.25) — the SLOSS (Single Large or Several Small) debate balances this against edge effects in reserve design.
Inputs
A Km2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
A Ref Km2
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
S Ref
Reference formula or conversion factor shown for context.
Z Exponent
Two-dimensional surface extent (m²). For complex shapes, break into simpler sub-shapes and sum.
Results
predicted species richness S
Sample size or count used in the calculation.
species lost if area halved (%)
The computed two-dimensional surface area.
z exponent (power-law slope)
The gradient -- rise divided by run. In finance, rate of change per unit time.
S = c·A^z | S = S_ref·(A/A_ref)^z
Reference formula or conversion factor shown for context.