Table 2. Test statistics D and I of the niche overlap proposed by Warren and based on Schoener’s D and Hellinger’s distances.

The niche overlap is high when comparing the parental species. But it decreases when comparing one of the parental species with the allopolyplid species (G. bermejoi).

Taxa	D	I
G. tomentosa—G. struthium struthium	0.7311903	0.9072852
G. tomentosa—G. bermejoi	0.4396845	0.6772885
G. struthium struthium—G. bermejoi	0.4957315	0.7369228