Table 2.

Summary of results from canonical correspondence analyses of the bacterioplankton community structure data when constrained by physicochemical and predators variables at 2 and 50 m in Lake Bourget and at 3 and 45 m in Lake Annecy^a

Lake, depth, and environmental variable	Total inertia	Sum of all canonical eigenvalues	Eigenvalue		Species-environment correlation		Cumulative % variance of:
			Axis 1	Axis 2	Axis 1	Axis 2	Species data		Species-environment relation
							Axis 1	Axis 2	Axis 1	Axis 2
Bourget
2 m
Physicochemical	1.346	0.932	0.465	0.243	0.936	0.899	34.6	52.7	49.9	76.0
Nutrients	1.346	0.544	0.340	0.145	0.837	0.780	25.3	36.0	61.3	87.5
50 m
Physicochemical	1.065	0.832	0.416	0.138	0.995	0.936	39.1	52.1	50.0	66.6
Nutrients	1.065	0.592	0.359	0.119	0.941	0.947	33.7	45.0	60.7	80.9
Physicochemical + predators	1.065	0.955	0.420	0.176	0.999	0.978	39.5	56.0	44.0	62.4
Annecy
3 m
Physicochemical	0.786	0.626	0.329	0.129	0.964	0.930	41.9	58.3	52.7	73.3
Nutrients	0.786	0.512	0.308	0.126	0.930	0.938	39.2	55.2	60.2	84.7
45 m
Physicochemical	0.832	0.595	0.363	0.116	0.945	0.894	43.6	57.5	60.9	80.4
Nutrients	0.832	0.494	0.350	0.092	0.935	0.770	42.1	53.2	70.9	89.7
Physicochemical + predators	0.832	0.766	0.405	0.177	0.993	0.999	48.6	69.9	52.8	75.9

^aIn Lake Bourget, the physicochemical variables were temperature, nitrate, ammonium, total phosphorus, dissolved oxygen, and chlorophyll a for 2-m samples and nitrate, ammonium, total phosphorus, silicates, dissolved oxygen, and chlorophyll a for 50-m samples. Predators were ciliates and PNF at 50 m. In Lake Annecy, the physicochemical variables were temperature, nitrate, ammonium, total phosphorus, silicates, dissolved oxygen, and chlorophyll a for 3-m samples and nitrate, ammonium, total phosphorus, and silicates for 45-m samples. Predators were HNF and viruses at 45 m. The total variance explained corresponded to the sum of all canonical eigenvalues divided by total inertia.