Table 1.

ANCOVA models of the relationships between four predictor variables—geographical subregion, population size, population density and population isolation—and population means for measures of pollination success, PTE and seed production in populations of S. longicauda. Values given are F ratios, except for sample size (n) that refers to the number of populations included in the model. Population size, density and isolation were log transformed prior to analysis. Response variables were angular-transformed proportions. (*p<0.05, **p<0.01, ***p<0.001.)

response variable	n	subregion	pop size	pop density	pop isolation
pollinated flowers	29	8.38***	0.50	0.07	0.41
flowers with pollen removed	28	3.32*	0.24	0.12	0.07
pollen transfer efficiency	29	5.15**	1.80	0.81	1.18
self-pollination	18	1.51	8.61*	3.20	0.79
fruit production	17	0.46	2.15	0.13	0.88
seeds with embryos	23	2.88	2.90	0.29	0.32