TABLE 1.

Nutrient concentrations in Vodoprovodnoye Lake.

Date	Depth, m	PO4 3−, mg P L−1	NH4 +, mg N L−1	NO2 −, mg N L−1	NO3 −, mg N L−1
2 Jul 2013	1.0	0.004 a	0.53 ± 0.09	0.006 ± 0.001	0.09 ± 0.01
21 Aug 2013	0.5	0.008 a	1.32 ± 0.14	0.006 ± 0.001	0.12 ± 0.01

Note: The concentrations (±SE) are presented as P (for phosphate) and N (for ammonium, nitrite, and nitrate), which are calculated from the raw concentrations of the ions based on the stoichiometry. The measurements were performed by the water quality testing laboratory, Kandalakshavodokanal, Kandalaksha.

^a Nominal value, as measured; below the detection threshold of 0.016 mg P L⁻¹ of the method used.