Table 5. Variance partitioning resulting from the partial canonical analyses of ecological and socioeconomical variables on species richness; data are for San Lorenzo. Fraction of variation Propor. of variation F ratio df P Ecological (a + b) 0.793 4.93 6,16 0.008 Socioeconomical (b + c) 0.294 1.80 2,16 n.s. Total variation 0.846 3.3 9,16 0.05 Fraction decomposed   Ecol. not explained by soc. (a) 0.552 3.08 7,6 n.s. Soc. explained by ecol. (b) 0.241   Soc. not explained by ecol. (c) 0.053 0.69 3,6 n.s. Unexplained variation (d) 0.154   Note: Calculations are explained in Table 4.