Table 2. Results of general linear models (GLM) for each response variable.

Model type	Response variable	Explanatory variable	F	P
GLM	μ	Salinity	19.17	<0.001
GLM	C uptake	Diversity	26.67	<0.001
GLM	C uptake	Salinity	14.69	<0.01
GLM	POC	Diversity	35.88	<0.001
GLM	POC	Salinity	0.04	0.838
GLM	POC	Diversity*salinity	3.76	<0.05
GLM	PON	Diversity	104.03	<0.001
GLM	PON	Salinity	32.90	<0.001
GLM	PON	Diversity*salinity	18.62	<0.001
GLM	POP	Diversity	37.55	<0.001
GLM	POP	Salinity	38.16	<0.001
GLM	POP	Diversity*salinity	10.82	<0.01
GLM	BSi	Diversity	12.80	<0.001
GLM	BSi	Salinity	0.16	0.686
GLM	BSi	Diversity*salinity	0.30	0.073

Significant effects of diversity indicate differences between diversity levels within the same salinity condition. Significant effects of salinity indicate differences in the response variables of different diversity levels between salinity conditions. Significant interaction effects suggest that the response of diversity levels were different depending on the salinity condition.