Table 5. Hybridization analysis for the sympatric L. fluviatilis (SFL_m) and L. planeri (SPL_r) from Tagus basin.

Estimated posterior probabilities of belonging to one of the six genotype frequency classes (pure parental, F₁, F₂ or backcrosses) for the individuals showing some evidence of hybridization. An individual is identified as belonging to a certain class if the posterior probability of falling into that class is above 0.5. Specimens are numbered as in Fig 5.

Species	Specimen	Pure SPLr	Pure SFLm	F1	F2	SPLr Bx	SFLm Bx
L. planeri (SPLr) n = 52	1	0.452	-	-	0.342	0.200	-
	8	0.577	0.106	-	0.233	0.075	-
	22	0.733	-	-	0.171	0.096	-
	29	0.587	-	-	0.301	0.113	-
	40	0.625	-	-	0.274	0.099	-
	47*	0.198	0.013	-	0.664	0.120	-
	52	0.023	0.537	-	0.394	0.023	0.022
L. fluviatilis (SFLm) n = 46	80	-	0.649	-	0.319	0.009	0.018

Genotype classes: Pure SPL_r, pure L. planeri; Pure SFL_m, pure L. fluviatilis; F₁, first generation hybrid; F₂, second generation hybrid; SPL_r Bx, L. planeri backcross (pure L. planeri mating with F₁); and SFL_m Bx, L. fluviatilis backcross (pure L. fluviatilis mating with F₁).

Bold indicates the class the individuals were classified into.

*Individual identified as hybrid.