Table 2. Results of general linear models showing the effects of species richness, presence of tolerant species on biomass (sqrtOD₆₀₀) in bacterial communities.

Factors	Heavy metals				NaCl				Warming
	df	SS	F	P	df	SS	F	P	df	SS	F	P
Sp. richness
Fitted first	5	1.66	15.33	1.5 × 10−13	5	1.27	10.79	1.2 × 10−9	5	0.34	6.52	8.4 × 10−6
Fitted second	4	1.59	18.34	1.3 × 10−13	4	0.67	7.08	1.7 × 10−5	4	0.13	3.13	0.015
Tol. sp.
Fitted first	4	1.01	9.27	2.8 × 10−8	7	1.06	6.43	4.2 × 10−7	4	0.42	9.99	1.2 × 10−7
Fitted second	3	0.93	10.77	3.2 × 10−8	6	0.46	3.23	0.004	3	0.21	6.64	2.3 × 10−4
Tol. sp *Sp. richness	6	0.54	4.43	2.5 × 10−4	5	0.38	3.32	6.1 × 10−3	7	0.13	1.82	0.08

Abbreviations: df, degrees of freedom; F, F-statistic; P, P-value; Sp. richness, species richness; SS, sum of squares; Tol. sp., number of tolerant species present.