Table 2.

Parameters of multiple linear regression analysis used to test the influence of temperature (T), irradiance (I), P-PO₄ and N-NO₃ concentrations as independent variables (Var) on the days until harvest (at OD_880nm = 0.1), number of cells per filament, number of heterocysts per filament, intra- and extracellular MC and NP contents per cell. The regression was logy = B₀ + B₁ × logX₁ + B₂ × logX₂ + B₃ × logX₃ + B₄ × logX₄, where X_1-4 is the corresponding (log₁₀ transformed) real value to be multiplied by the regression coefficients B1-B4.

	Var1	Var2	Var3	Var4	R2 Var1	R2 Var2	R2 Var3	R2 Var4	B0	B1	B2	B3	B4
Days until day of first harvest	T	I	P-PO4	N-NO3	0.39	0.64	0.87	0.89	2.291	−0.037	−0.006	−0.002	−0.016
Cells · fil−1	P-PO4	I			0.05	0.098			1.468	0.001	−0.002
Heterocysts · fil−1	P-PO4	N-NO3			0.38	0.61			−0.304	0.004	−0.077
Microcystin
MC fg· cell−1	I	P-PO4			0.38	0.48			2.156	−0.006	−0.001
Total MC fg· cell−1	I	P-PO4	T		0.28	0.46	0.51		2.404	−0.005	−0.001	−0.011
Diss MC fg· cell−1	P-PO4	T			0.24	0.47			2.001	−0.003	−0.039
%diss MC	T	P-PO4	I		0.27	0.38	0.44		1.621	−0.028	−0.001	0.003
Nostophycin
NP fg· cell−1	P-PO4	I	T		0.39	0.69	0.72		2.057	−0.003	−0.008	0.012
Total NP fg· cell−1	P-PO4	I	T		0.55	0.75	0.77		2.24	−0.004	−0.007	0.011
Diss NP fg· cell−1	P-PO4	T	I		0.67	0.73	0.78		1.56	−0.006	0.025	−0.005
%diss NP	P-PO4	I	T		0.33	0.39	0.43		1.346	−0.002	0.003	0.009