Table 1.

Comparison of the native and non-native niches for Aedes albopictus and Aedes aegypti. Niche overlap was calculated as Schoener’s D comparing the niches in range 1 (R1) and range 2 (R2).

Range 1	Range 2	Niche overlap (D)	Niche similarity		Niche equivalency
			R1 → R2	R2 → R1
Aedes albopictus
Asia†	Europe	0.03	ns	ns	different*
Asia†	Africa	0.16	ns	ns	different*
Asia†	North America	0.09	similar*	ns	different*
Asia†	South America	0.11	ns	ns	different*
Europe	Africa	0	ns	ns	different*
Europe	North America	0.25	similar*	similar*	ns
Europe	South America	0.02	ns	ns	different*
Africa	North America	0.01	ns	ns	different*
Africa	South America	0.16	ns	similar*	different*
North America	South America	0.36	ns	ns	different*
Aedes aegypti
Africa†	Asia	0.27	similar*	similar*	different*
Africa†	North America	0.18	ns	ns	ns
Africa†	South America	0.18	ns	ns	ns
Asia	North America	0.31	similar*	similar*	different*
Asia	South America	0.28	similar*	similar*	different*
North America	South America	0.45	ns	ns	ns

^†Native range.

ns = not significant.

^*The ecological niches are significantly (α = 5%) more similar (similarity test) or different (equivalency test) than expected by chance.