Table 2 Results of a distance-based multivariate linear model for the BCC showing the percentage of variation explained by individually environmental variables (ignoring other variables); and forward-selection of variables, where amount explained by each variable added to model is conditional on variables already in the model.

Variable	F	P	Variation (%)	Cumulative (%)
Variables fitted individually
Temperature	10.71	0.001	20.31
Sampling time	10.01	0.001	19.25
Total phosphorus	9.15	0.001	17.88
Dissolved oxygen	8.47	0.001	16.78
Chemical oxygen demand	6.96	0.001	14.22
PO₄³⁻	6.43	0.001	13.28
C/N ratio	6.15	0.001	12.78
Chlorophyll a	6.01	0.001	12.51
NO₃⁻	5.95	0.001	12.42
NH₄⁺	5.76	0.001	12.05
DIN	5.10	0.001	10.83
Total nitrogen	4.40	0.001	9.48
NO₂⁻	3.55	0.002	7.80
Total organic carbon	2.62	0.008	5.87
Variables fitted sequentially
Temperature	10.71	0.001	20.31	20.31
Sampling time	6.81	0.001	10.47	30.79
Dissolved oxygen	6.21	0.001	10.06	40.85
C/N ratio	3.87	0.001	5.34	46.19
NO₂⁻	3.97	0.001	5.09	51.28
Total organic carbon	4.22	0.001	4.99	56.27
PO₄³⁻	3.61	0.001	3.99	60.26
Total phosphorus	3.41	0.001	3.53	63.79
NO₃⁻	3.53	0.001	3.40	67.20
NH₄⁺	3.39	0.001	3.06	70.25
Chemical oxygen demand	2.37	0.001	2.05	72.30

NOTE: Program ended prematurely because not all variables increased the regression model in the conditional tests. DIN: dissolved inorganic nitrogen, the sum of NH₄⁺, NO₃⁻ and NO₂⁻.

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