Work out effective population size instantly with clear inputs, formula shown and shareable results.
Applies the unequal sex ratio formula for effective population size and converts it into the rate at which inbreeding accumulates.
Effective population size
Ne = 4 Nm Nf / (Nm + Nf); inbreeding per generation = 1 / (2 Ne)
Unequal sex ratios, variance in reproductive success and fluctuating numbers all reduce it, often to a tenth of the census.
Ne of 50 is the short-term minimum to limit inbreeding and 500 the long-term minimum to retain adaptive variation.