Table 1 Properties of the lake waters used in this study: lake pH and DOC concentrations were determined in the test water used for the bioassays

RT90 X–Y

758,208–161,749

633,025–142,267

655,587–158,869

655,275–153,234

Latitude

68.3067°N

57.0917°N

59.0948°N

59.0948°N

Longitude

18.6550°E

14.5317°E

16.3693°E

16.3693°E

Catchment

Above treeline, tundra vegetation

Coniferous forest, some agriculture

Coniferous forest

Coniferous forest, some wetlands

Lake area (km²)

2.8

1.6

3.7

0.35

Max depth (m)

35

10

11

7.7

pH^a

7.6

6.5

6.5

6.5

DOC (mg/L)^a

0.88

7.0

10

17

Ca (mg/L)

4.5 ± 1.46

2.9 ± 0.22

3.4 ± 0.19

5.6 ± 0.93

Mg (mg/L)

0.70 ± 0.21

1.0 ± 0.1

0.85 ± 0.06

1.9 ± 0.30

Na (mg/L)

1.0 ± 0.53

3.9 ± 0.27

2.2 ± 0.09

3.2 ± 0.54

K (mg/L)

0.59 ± 0.13

1.5 ± 0.15

0.29 ± 0.02

0.85 ± 0.15

SO₄ (mg/L)

4.3 ± 1.35

6.2 ± 0.68

5.9 ± 0.56

5.6 ± 1.31

Cl (mg/L)

1.1 ± 0.87

6.0 ± 0.51

2.8 ± 0.17

2.8 ± 0.42

Alk (mg CaCO₃/L)

10 ± 4.43

3.0 ± 0.76

3.0 ± 0.62

13 ± 3.31

Hardness (mg CaCO₃/L)

13

9.8

10

18

Cu (µg/L)*

0.91

0.74

0.38

0.78

Fe (µg/L)^a

2.01

33

31

393

Cd (µg/L)^a

0.012

0.034

0.006

0.006

Zn (µg/L)^a

0.5

5

1.6

0.8

Pb (µg/L)^a

0.005

0.1

0.06

0.08

Al (µg/L)^a

1.5

49.7

33.7

56.9