Table 3. Regression coefficients and comparison between the five hypotheses used to explain the distribution of fish species richness in streams.

Hypotheses	r2	p	AIC	Δ AIC	Moran’s I	r2 for partial regression results
						A.B	A:B	B.A	1-(A+B)
Temporal Heterogeneity	0.401	<0.001	4510.500	0.000	0.093	0.031	0.054	0.316	0.599
Energy	0.376	<0.001	4535.200	24.700	0.115	0.007	0.090	0.279	0.624
Area	0.301	<0.001	4538.400	27.900	0.122	0.005	0.053	0.316	0.626
Water-Energy	0.376	<0.001	4538.900	28.400	0.114	0.007	0.143	0.226	0.624
Neutral	0.369	<0.001	4539.900	29.400	0.128	-	-	-	0.631
Terrestrial Productivity	0.370	<0.001	4541.600	31.100	0.131	0.001	0.001	0.370	0.628

r²—Coefficient of determination; p—Type one error probability; AIC—Information criterion of Akaike; Δ AIC—Akaike variation; Moran’s I—Autocorrelation index of Moran for variable; A.B—Environmental component; A:B—Shared Component; B.A—Spatial Component; 1-(A+B)–Residual