Table 1. List of evidences arguing in favor of a high level of differentiation between the two FAW strains.

	Suitability	References
Pre-zygotic barrier
Habitat isolation	+ / -	Whitford et al., [140] Meagher et al., [94] Juárez et al., [91]
Temporal isolation	++	Schöfl et al., [79,139]
Behavioral isolation	++	Groot et al., [78] Lima and McNeil [138]
Unidirectional mating	+/-	Pashley and Martin [141] Dumas et al., [142]
Post-zygotic barrier
Reduction of hybrid fertility and reduction of hybrid female numbers	+	Velásquez-Vélez et al., [146]
Genetic differentiation
Phylogenetic analyses	++	Kergoat et al., [85]

As indicated by the combination of pros and cons some results are more or less contradictory.