Table 5.

Summary of niche identity and background similarity tests. “Divergence” indicates that the compared populations show significant divergence (overlap is less than expected), while “Conservatism” indicates niche conservatism (overlap values are more similar than expected). “**” indicates a significant (p < .01?), and “n.s.” no significant, difference between expected and observed overlap

a	b	Schoener's D	Modified Hellinger I	Niche D/I
Niche identity test
I. elegans allopatric	I. elegans sympatric	0.398**	0.679**	Not identical/not identical
I. graellsii allopatric	I. graellsii sympatric	0.508**	0.793**	Not identical/not identical
I. elegans allopatric	I. graellsii allopatric	0.291**	0.564**	Not identical/not identical
I. elegans allopatric	I. graellsii sympatric	0.499**	0.767**	Not identical/not identical
I. elegans sympatric	I. graellsii allopatric	0.593**	0.844**	Not identical/not identical
I. elegans sympatric	I. graellsii sympatric	0.733**	0.935**	Not identical/not identical

a	b	Schoener's D		Modified Hellinger I		Niche D/I
		a → b	b → a	a → b	b → a	a → b	b → a
Background similarity test
I. elegans allopatric	I. elegans sympatric	0.392**	0.672**	0.392**	0.672**	Divergence/divergence	Divergence/divergence
I. graellsii allopatric	I. graellsii sympatric	0.511*	n.s.	n.s.	n.s.	Conservatism/similar	Similar/similar
I. elegans allopatric	I. graellsii allopatric	0.295**	0.567**	0.295**	0.567**	Divergence/divergence	Divergence/divergence
I. elegans allopatric	I. graellsii sympatric	n.s.	n.s.	n.s.	n.s.	Similar/similar	Similar/similar
I. elegans sympatric	I. graellsii allopatric	0.589**	0.842**	0.589**	0.842**	Conservatism/conservatism	Conservatism/conservatism
I. elegans sympatric	I. graellsii sympatric	0.735**	0.937**	0.735**	0.937**	Conservatism/conservatism	Conservatism/conservatism