Table 1.

Initial concentrations of nitrate, phosphate, DOC, DON, DOM C:N ratios¹, and fluorescence intensity of the identified DOM fluorescent components for the incubations.

Day	Temperature (°C)	Nitrate (μmol L-1)	Phosphate (μmol L-1)	DOC (μmol L-1)	DON (μmol L-1)	C:N ratio	C1 (RU)	C2 (RU)	C3 (RU)	C4 (RU)
12/15/15	26.8	3.5	0.082	80.8	4.8	16.8	0.036	0.018	0.025	0.024
2/9/16	23.4	2.2	0.039	98.2	5.9	16.6	0.028	0.015	0.018	0.017
3/13/16	29.7	5.0	0.085	83.7	5.2	16.1	0.032	0.026	0.012	0.028
4/11/16	30.0	5.9	0.041	90.6	8.2	11.0	0.039	0.022	0.028	0.019
5/16/16	32.8	3.0	0.045	89.3	8.8	10.1	0.040	0.021	0.032	0.013
6/13/16	33.7	21.2	n.a	88.6	10.3	8.6	0.054	0.027	0.020	0.011
7/26/16	33.4	28.8	0.099	86.9	7.4	11.7	0.064	0.032	0.026	0.013
8/8/16	33.7	23.2	0.085	86.5	10.1	8.6	0.049	0.026	0.019	0.010
9/21/16	33.8	18.0	0.045	89.3	5.9	15.1	0.050	0.027	0.021	0.011
10/10/16	33.2	83.7	0.071	91.9	4.2	21.9	0.083	0.037	0.043	0.012
11/7/16	29.5	9.9	0.038	87.5	6.5	13.5	0.054	0.029	0.028	0.011
12/12/16	26.9	6.2	0.084	85.2	3.5	24.3	0.044	0.024	0.051	0.007
1/17/17	24.8	3.9	0.078	73.8	2.5	29.5	0.021	0.013	0.016	0.009
2/13/17	23.8	5.2	0.091	76.4	4.3	17.8	0.037	0.020	0.020	0.009
3/5/17	25.9	3.3	0.115	74.1	8.3	8.9	0.030	0.016	0.017	0.012

¹C:N ratios were obtained by dividing DOC by DON.