Table 1.

Summary of Postmating Reproductive Isolation (RI).

Pair a, b	Crossing success RI		Seed viability RI		F1 viability RI		Total measured RI
	a->b	b->a	a->b	b->a	a->b	b->a	a->b	b->a
J, B	0.30	0.10	0.99	1.00	--	--	0.99	1.00
J, F	−0.13	−0.05	0.97	1.00	--	--	0.97	1.00
B, F	0.91	0.13	−0.03	0.09	--	0.57	0.91	0.66
J, S	0.35	−0.07	1.00	0.97	--	--	1.00	0.96
B, S	0.05	0.16	1.00	0.99	--	--	1.00	0.99
F, S	1.00	0.68	--	1.00	--	--	1.00	1.00

a->b indicates reproductive isolation preventing gene flow from species a into species b, calculated by comparing the fitness of b x a crosses relative to b x b crosses, with b>a indicating the reciprocal direction using the fitness of a x b crosses relative to a x a crosses, following (Sobel & Chen, 2014). Values range from −1 (complete heterosis) to 0 (free mating) to 1 (complete reproductive isolation).

Bolded values include contributions from barriers with significant model results.