Table 1.

Summary of statistical findings from the reduced zero-inflated negative binomial models

Experiment	Sample type	Infection measurement	Predictor	Test statistic	df	P
1: Daphnia magna at five densities grazing 5 or 72 h1	Water	Proportion	Daphnia density	X2 = 2.32	1	0.128
			Grazing period	X2 = 77.06	1	<0.001
		Amount	Daphnia density	X2 = 7.15	1	0.008
			Grazing period	X2 = 43.45	1	<0.001
	Tadpole	Proportion	Daphnia density	X2 = 6.53	1	0.011
			Grazing period	X2 = 12.01	1	0.001
		Amount	Grazing period	X2 = 2.50	1	0.114
2: Daphnia dentifera at five densities grazing 5 or 72 h1	Water	Proportion	Daphnia density	X2 = 13.76	1	<0.001
			Grazing period	X2 = 64.16	1	<0.001
		Amount	Grazing period	X2 = 50.82	1	<0.001
	Tadpole	Proportion	Grazing period	X2 = 69.46	1	<0.001
		Amount	Daphnia density	X2 = 3.00	1	0.083
			Grazing period	X2 = 6.29	1	0.012
3: Presence/absence of D. dentifera varying food density2	Water	Amount	Daphnia density	X2 = 8.17	1	0.004
			Food density	X2 = 4.53	1	0.033
			Daphnia density x Food density	X2 = 6.21	1	0.013
	Tadpole	Proportion	Daphnia density	X2 = 7.70	1	0.005
		Amount3	Daphnia density	X2 = 10.80	1	0.001
			Daphnia density x Food density	X2 = 9.28	1	0.002

¹Initial models for experiments 1 and 2 included D. magna or D. dentifera density (respectively), grazing period, and the interaction term.

²Initial model for experiment 3 included food level, D. dentifera density, and the interaction term.

³The results for amount of Bd detected in tadpole samples in experiment 3 were driven by a single sample. When we removed this sample, there were no significant predictors for this response.