Table 2. Summary of the GLMM for enzyme activity.

Enzymea	AIC	Random effect	Variance	Explanatory variables	Estimate	SE	t-value	LCLb	UCLc
Acid phosphatase	232.2	Intercept by Pitcher ID	0.50	(Intercept)	1.73	1.32	1.31	−0.37	4.00
(AP)		Slope (Filtration treatment)by Pitcher ID	0.03	Filtration treatment	−0.42	0.12	−3.50	−0.77	−0.06
		Intercept by date	0.83	Log(pH)	0.69	0.84	0.82	−0.70	2.01
				Species N. ampullaria	−1.41	0.44	−3.19	−2.11	−0.72
				Species N. bicalcarata	−0.69	0.61	−1.14	−1.73	0.21
				Species N. gracilis	0.83	0.61	1.35	−0.18	1.75
beta-D-glucosidases	425.7	Intercept by Pitcher ID	0.00	(Intercept)	4.58	9.46	0.49	−6.91	28.68
(BG)		Slope (Filtration treatment)by Pitcher ID	12.79	Filtration treatment	−4.82	1.11	−4.35	−7.48	−2.13
		Intercept by date	0.00	Log(pH)	1.79	6.82	0.26	−10.65	12.66
				Species N. ampullaria	−3.47	3.37	−1.03	−15.32	−2.24
				Species N. bicalcarata	−2.56	4.37	−0.59	−13.70	2.22
				Species N. gracilis	−1.07	3.94	−0.27	−17.59	0.06
beta-D-glucosaminidases	319.1	Intercept by Pitcher ID	0.00	(Intercept)	5.30	12.24	0.43	−16.31	30.78
(NAG)		Slope (Filtration treatment)by Pitcher ID	12.74	Filtration treatment	−4.88	1.22	−4.02	−7.87	−1.84
		Intercept by date	0.00	Log(pH)	1.08	7.84	0.14	−12.12	17.08
				Species N. ampullaria	−3.43	3.95	−0.87	−14.62	1.58
				Species N. bicalcarata	−2.09	4.25	−0.49	−14.72	2.81
				Species N. gracilis	−2.37	5.25	−0.45	−18.93	3.08

The standard error (SE) and t values of the parameters are shown.

^aEnzyme activities were log-transformed.

^bLower and

^cupper 95% confidence limits for each estimates (10,000 iterations).