Table 1. Equivalence and similarity.

	Equivalence	Similarity		Expansion	Stability	Unfilling
		X→Z	Z→X
Zone A	D = 0.0003	D = 0.003–0.003		0.340	0.659	0.990
	P = 0.01	P = 0.01–0.68
Zone B	D = 0	D = 0–0		0.944	0.055	0.996
	P = 0.01	P = 1–1
Zone C	D = 0	D = 0–0		1	0	1
	P = 0.01	P = 1–1
Zone D	D = 0.06	D = 0.06–0.06		0.532	0.467	0.174
	P = 0.01	P = 0.03–0.3

(X → Z: from native to exotic; Z → X: from exotic to native) are measured in terms of niche overlap (Schoener’s D) and P means statistical significance. Expansion and Stability are proportions of the non-overlapping and overlapping exotic niche, respectively, with the native niche. Unfilling is the proportion of the native niche available, but non-occupied in the exotic niche.