A comparison of two methods of calculating GST, a genetic measure of population differentiation.

G(ST) is a genetic statistic describing differentiation of populations and has frequently been compared with Hamrick and Godt's (1989) review of the plant literature. We show here that some comparisons may be inappropriate if G(ST) was calculated in a different way than that used by Hamrick and Godt (HG). An alternative method advocated by Nei is mathematically different from the HG technique, occasionally resulting in different G(ST) values.