Table 2.

Results of GLM assessing how trematode standing stock^a is affected by trematode assemblage diversity and other predictor variables.

predictor	d.f.	SS	F-ratio	r2	p
diversity (mixed or single species)	1	0.032	12.42b	0.15	0.0004c
assemblage (diversity)d	30	0.151	4.21	0.46	<0.0001
season (summer or winter)	1	0.028	23.08	0.13	<0.0001
habitat (channel or flat)	1	0.012	10.31	0.06	0.0016
total tissue weight	1	0.170	141.95	0.49	<0.0001
full model	34	0.838	20.61	0.82	<0.0001
residual	150	0.179

^aTrematode mass was fourth-root transformed in analysis to meet assumptions of normality and homogeneity of variance.

^bThe synthesized denominator mean squared error for this test was 0.0026, with 59.1 d.f.

^cOne-tailed p-value.

^dThe particular species (15 spp.) or species-pair combination (17 types) as a random factor nested within if an assemblage was mixed or single species.