Table 4 Model averaged parameter estimates, standard error, lower and upper 95% CI by year and response variable.

Year and Response	Parameter	Estimate	SE	Lower	Upper
2002
Richness	Intercept	4.95	1.15	2.70	7.21
	Depth	0.23	0.27	− 0.30	0.75
	Substrate	0.03	0.13	− 0.23	0.28
	Velocity	− 0.02	0.14	− 0.30	0.26
	Season*	0.45	0.11	0.22	0.67
	Flow regime	− 0.25	1.10	− 2.40	1.90
Total abundance	Intercept	− 137.23	158.98	− 448.83	174.37
	Depth	24.43	26.93	− 28.35	77.21
	Substrate	− 21.00	27.10	− 53.12	32.12
	Velocity	0.20	30.72	− 60.21	60.41
	Season*	49.40	15.50	19.02	79.78
	Flow regime	56.83	157.37	− 251.62	365.28
Total density	Intercept	− 0.94	0.59	− 2.10	0.22
	Depth*	− 0.26	0.11	− 0.48	− 0.04
	Season*	0.25	0.04	0.17	0.33
	Flow regime	− 0.19	0.71	− 1.58	1.20
2003
Richness	7.12	1.03	5.10	9.14
	Depth*	0.85	0.19	0.48	1.22
	Velocity*	− 0.60	0.20	− 0.99	− 0.21
	Season	0.08	0.09	− 0.09	0.27
	Flow regime	0.68	1.16	− 1.59	2.95
Total abundance	Intercept	6.07	0.39	5.31	6.83
	Depth*	0.29	0.07	0.15	0.43
	Season	− 0.89	0.30	− 1.49	− 0.30
	Flow Regime	− 0.45	0.30	− 1.03	0.13
Total density	Intercept	0.79	0.44	− 0.07	1.65
	Velocity*	− 0.21	0.07	− 0.35	− 0.07
	Season	− 0.03	0.03	− 0.03	0.002
	Flow Regime	0.18	0.55	− 0.90	1.26

Model averaging was done for top models (AICc < 2) for each species. Parameter estimates with 95% CI not overlapping zero are considered significant and marked with an asterisk.

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