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Figure 1

Location of the studied lakes: 1. Biała Kuta, 2. Krzywa Kuta, 3. Kacze, 4. Smolak, 5. Łękuk, 6. Wolisko, 7. Pilwąg, 8. Szwałk Wielki, 9. Ciche, 10. Szwałk Mały, 11. Łaźno, 12. Litygajno, 13. Dubinek
Location of the studied lakes: 1. Biała Kuta, 2. Krzywa Kuta, 3. Kacze, 4. Smolak, 5. Łękuk, 6. Wolisko, 7. Pilwąg, 8. Szwałk Wielki, 9. Ciche, 10. Szwałk Mały, 11. Łaźno, 12. Litygajno, 13. Dubinek

Figure 2

The percentage of individual forms of carbon in the littoral sediments in lakes of Borecka Forest
The percentage of individual forms of carbon in the littoral sediments in lakes of Borecka Forest

Morphometric parameters of Borecka Forest lakes

Lake Catchment Natura 2000 Code

shallow lakes (3140), eutrophic lakes (3150), dystrophic lakes (3160)

Area Height Volume Average depth Max. depth Depth factor Shoreline depth Shoreline development Lake length Average width Elongation factor
[ha] [m a.s.l.] [Mm3] [m] [m] [m] [m] [m]
Biala Kuta Pregola 3140 21.3 134.3 318.2 1.4 3.2 0.44 2700 1.65 1200 177.5 6.76
Krzywa Kuta 3150 131.2 134.4 7883.1 6.0 26.5 0.23 8550 2.11 2250 583.1 3.86
Kacze 3160 1.8 134.3 5.1 0.3 0.8 0.38 490 1.04 171 103.0 1.66
Smolak 3160 7.0 135.3 125.9 1.7 5.1 0.33 1190 1.27 500 140.0 3.57
Łękuk 3150 20.7 127.4 957.4 4.6 12.5 0.37 1900 1.18 675 306.7 2.20
Wolisko Vistula 3150 13.5 175.9 620.2 4.6 8.6 0.53 1780 1.37 588 229.6 2.56
Pilwag 3150 135.1 133.3 2025.3 1.5 3.6 0.42 7940 1.93 2320 582.3 3.98
Szwalk Wielki 3150 213.4 133.4 10505.8 4.9 11 0.45 9350 1.81 3800 561.6 6.77
Ciche 3150 15.0 141.9 330.0 2.2 4.5 0.49 2560 1.86 689 217.7 3.16
Szwalk Maly 3150 70.4 133.6 3016.8 4.3 6.7 0.64 4900 1.65 1485 474.1 3.13
Łaźno 3150 562.4 133.2 32017.9 5.7 18 0.32 17825 2.12 6200 907.1 6.83
Litygajno 3150 162.1 133.1 9763.9 6.0 16.4 0.37 10675 2.37 4700 344.9 13.63
Dubinek 3140 12.1 151.4 310.1 2.5 6.2 0.40 1660 1.35 638 189.7 3.36

Ecotoxicological assessment of sediments in rivers and lakes (Macdonald 1994, CCME 1999)

Metal TEL PEL
(mg kg–1)
Zn 123 315
Cu 36 197
Pb 35 91
Ni 16 42
Cd 0.6 3.5

Heavy metals in sediments arranged in order from the highest to the lowest concentration for a given metal

Lake Order of heavy metals
Biała Kuta Zn < Cu < Pb < Ni < Cd
Krzywa Kuta Zn < Cu < Pb < Ni < Cd
Kacze Zn < Pb < Cu < Ni = Cd
Smolak Zn < Cu < Pb < Ni < Cd
Łękuk Zn < Pb < Cu < Ni < Cd
Wolisko Zn < Cu < Pb < Ni < Cd
Pilwąg Zn < Cu < Pb < Ni < Cd
Szwałk Wielki Zn < Cu < Pb < Ni < Cd
Ciche Zn < Pb < Cu < Ni < Cd
Szwałk Mały Zn < Cu < Pb < Ni < Cd
Łaźno Cu < Zn < Pb < Ni < Cd
Litygajno Zn < Pb < Cu < Ni < Cd
Dubinek Zn < Cu < Ni < Pb < Cd

Values of geoaccumulation indices (Igeo) of heavy metals in littoral sediments from lakes in Borecka Forest

Lake Background Igeo-Zn Igeo-Cu Igeo-Pb Igeo-Ni Igeo-Cd
Biała Kuta GBP −4.07 −0.76 −2.55 −2.78 −4.00
GBE −3.95 −3.23 −2.74 −5.05 −1.67
KrzywaKuta GBP −5.01 −2.39 −4.41 −3.38 −2.97
GBE −4.88 −4.86 −4.59 −7.15 −0.64
Kacze GBP −1.37 0.57

- unpolluted to moderately polluted sediments (class I);

0.25

- unpolluted to moderately polluted sediments (class I);

−3.55 −0.23
GBE −1.25 −1.91 0.07

- unpolluted to moderately polluted sediments (class I);

−7.31 2.10

- moderately to strongly polluted sediments (class III);

Smolak GBP −3.28 −0.90 −2.96 −3.91 −3.91
GBE −3.15 −3.38 −3.14 −7.67 −1.58
Łękuk GBP −3.11 −0.92 −1.84 −1.69 −2.95
GBE −2.99 −3.40 −2.02 −5.46 −0.63
Wolisko GBP −2.29 −1.37 −3.36 −1.96 −2.92
GBE −2.16 −3.85 −3.54 −5.72 −0.60
Pilwąg GBP −2.47 0.02

- unpolluted to moderately polluted sediments (class I);

−2.97 −2.19 −2.33
GBE −2.35 −2.46 −3.15 −5.96 −0.01
Szwałk Wielki GBP −4.24 −1.50 −4.12 −3.14 −2.40
GBE −4.11 −3.98 −4.31 −6.91 −0.08
Ciche GBP −3.61 −1.95 −3.03 −1.97 −1.97
GBE −3.49 −4.43 −3.21 −5.74 0.35

- unpolluted to moderately polluted sediments (class I);

SzwalkMaly GBP −7.46 −2.04 −4.66 −2.47 0.74

- unpolluted to moderately polluted sediments (class I);

GBE −7.34 −4.52 −4.84 −6.24 3.06

- strongly polluted sediments (class IV)

Łaźno GBP −4.98 −0.73 −3.57 −2.39 −2.39
GBE −4.86 −3.21 −3.75 −6.16 −0.07
Litygajno GBP −3.76 −1.57 −2.46 −2.04 −2.94
GBE −3.64 −4.05 −2.64 −5.81 −0.61
Dubinek GBP −2.00 0.45

- unpolluted to moderately polluted sediments (class I);

−1.78 0.69

- unpolluted to moderately polluted sediments (class I);

−3.91
GBE −1.88 −2.03 −1.96 −3.08 −1.58

Contamination factors (CF), the percentage of each metal in the total sediment contamination (%CF) with heavy metals in littoral sediments and the degree of sediment contamination (Cd)

Lake Background CF (Zn) %CF (Zn) CF (Cu) %CF (Cu) CF (Pb) %CF (Pb) CF (Ni) %CF (Ni) CF (Cd) %CF (Cd) ?CF Cd
Biała Kuta GBP 0.09 5.8 0.89 57.5 0.26 16.5 0.22 14.1 0.09 6.1 1.54 0.31
GBE 0.10 10.0 0.16 16.5 0.23 23.3 0.02 1.7 0.47 48.6 0.97 0.19
Krzywa Kuta GBP 0.05 6.3 0.29 38.8 0.07 9.5 0.14 19.5 0.19 25.9 0.74 0.15
GBE 0.05 4.5 0.05 4.5 0.06 5.5 0.01 0.9 0.96 84.6 1.14 0.23
Kacze GBP 0.58 9.7 2.23

– moderate contamination level;

37.1 1.78

– moderate contamination level;

29.7 0.13 2.1 1.28

– moderate contamination level;

21.4 6.00 1.20
GBE 0.63 7.0 0.40 4.4 1.57

– moderate contamination level;

17.4 0.01 0.1 6.41

– very high contamination level;

71.0 9.03 1.81

– low contamination level;

Smolak GBP 0.15 11.5 0.80 59.5 0.19 14.3 0.10 7.4 0.10 7.4 1.35 0.27
GBE 0.17 17.0 0.14 14.6 0.17 17.2 0.01 0.7 0.50 50.5 0.99 0.20
Łękuk GBP 0.17 8.5 0.79 38.8 0.42 20.5 0.46 22.7 0.19 9.5 2.05 0.41
GBE 0.19 11.1 0.14 8.4 0.37 21.7 0.03 2.0 0.97 56.9 1.71 0.34
Wolisko GBP 0.31 19.0 0.58 35.9 0.15 9.0 0.39 23.9 0.20 12.2 1.62 0.32
GBE 0.34 21.1 0.10 6.6 0.13 8.1 0.03 1.8 0.99 62.4 1.59 0.32
Pilwąg GBP 0.27 10.4 1.52

– moderate contamination level;

58.2 0.19 7.4 0.33 12.6 0.30 11.4 2.60 0.52
GBE 0.30 13.1 0.27 12.1 0.17 7.5 0.02 1.1 1.49

– moderate contamination level;

66.2 2.25 0.45
Szwałk Wielki GBP 0.08 6.9 0.53 46.0 0.09 7.5 0.17 14.8 0.28 24.7 1.15 0.23
GBE 0.09 5.1 0.09 5.6 0.08 4.5 0.01 0.7 1.42

– moderate contamination level;

84.0 1.69 0.34
Ciche GBP 0.12 8.4 0.39 26.6 0.18 12.6 0.38 26.2 0.38 26.2 1.46 0.29
GBE 0.13 5.8 0.07 3.0 0.16 7.0 0.03 1.2 1.91

– moderate contamination level;

82.9 2.30 0.46
Szwałk Mały GBP 0.01 0.3 0.36 11.4 0.06 1.9 0.27 8.4 2.50

– moderate contamination level;

78.1 3.20 0.64
GBE 0.01 0.1 0.07 0.5 0.05 0.4 0.02 0.2 12.49

– very high contamination level;

98.8 12.64 2.53

– moderate contamination level

Łaźno GBP 0.05 2.9 0.90 54.7 0.13 7.7 0.29 17.4 0.29 17.4 1.65 0.33
GBE 0.05 2.9 0.16 9.1 0.11 6.3 0.02 1.2 1.43

– moderate contamination level;

80.5 1.78 0.36
Litygajno GBP 0.11 7.6 0.51 34.9 0.27 18.8 0.36 25.1 0.20 13.5 1.45 0.29
GBE 0.12 8.3 0.09 6.2 0.24 16.5 0.03 1.8 0.98 67.2 1.46 0.29
Dubinek GBP 0.37 7.0 2.04

– moderate contamination level;

38.0 0.44 8.1 2.42

– moderate contamination level;

45.0 0.10 1.9 5.37 1.07
GBE 0.41 22.2 0.37 19.9 0.39 21.0 0.18 9.7 0.50 27.2 1.84 0.37

The average content of heavy metals, total carbon (TC), total organic carbon (TOC), total inorganic carbon (TIC) in littoral sediments in lakes of Borecka Forest

Lake Zn Cu Pb Ni Cd TOC TIC TC
(mg kg−1) g C kg−1
Biała Kuta 6.50 6.22 3.83 1.09 0.05 16.00 0.11 16.11
Krzywa Kuta 3.41 2.01 1.06 0.72 0.10 6.01 0.03 6.04
Kacze 42.35 15.60 26.77 0.64 0.64 494.46 0.22 494.68
Smolak 11.31 5.62 2.89 0.05 0.05 44.58 0.12 44.71
Łękuk 12.65 5.56 6.03 2.32 0.10 7.20 3.65 10.86
Wolisko 22.46 4.06 2.19 1.93 0.10 6.30 9.17 15.46
Pilwąg 19.78 10.61 2.88 1.64 0.15 41.96 7.16 49.12
Szwałk Wielki 5.80 3.70 1.29 0.85 0.14 12.17 0.03 12.20
Ciche 8.96 2.72 2.76 1.91 0.19 8.57 0.11 8.67
Szwałk Mały 0.62 2.55 0.89 1.35 1.25 15.56 0.04 15.60
Łaźno 3.46 6.31 1.90 1.43 0.14 9.79 15.11 24.90
Litygajno 8.06 3.54 4.08 1.82 0.10 22.95 0.74 23.69
Dubinek 27.3 14.3 6.57 12.1 0.05 50.30 10.42 60.72
Average 13.28 6.37 4.88 2.18 0.23 56.60 3.61 60.21
Min. 0.62 2.01 0.89 0.50 0.05 6.01 0.03 6.04
Max. 42.35 15.60 26.77 12.10 1.25 494.46 15.11 494.68
SD ±11.81 ±4.42 ±6.82 ±3.03 ±0.34 ±132.47 ±5.14 ±131.65
V 112.44 144.03 71.54 71.74 68.76 42.73 70.19 45.74
GBP 73 7 15 5 0.5
GBE 67 39 17 68 0.1

Heavy metal pollution of littoral sediments from lakes in Borecka Forest

Lake Zn Cu Pb Ni Cd Sediment evaluation
Sediment purity classes
Biała Kuta 0 0 0 0 0 geochemical background
KrzywaKuta 0 0 0 0 0 geochemical background
Kacze 0 I I 0 I unpolluted
Smolak 0 0 0 0 0 geochemical background
Łękuk 0 0 0 0 0 geochemical background
Wolisko 0 0 0 0 0 geochemical background
Pilwąg 0 I 0 0 0 unpolluted
Szwałk Wielki 0 0 0 0 0 geochemical background
Ciche 0 0 0 0 0 geochemical background
SzwalkMaly 0 0 0 0 II moderately polluted
Łaźno 0 0 0 0 0 geochemical background
Litygajno 0 0 0 0 0 geochemical background
Dubinek 0 I 0 I 0 unpolluted

Values of Pearson’s correlation coefficients between heavy metals, TOC and TIC in sediments

Zn Cu Pb Ni Cd TOC TIC
Zn 1
Cu

significant at p<0.01 and 0.05, respectively

0.85
1
Pb

significant at p<0.01 and 0.05, respectively

0.82

significant at p<0.01 and 0.05, respectively

0.73
1
Ni 0.34 0.49 0.03 1
Cd 0.00 0.00 0.24 −0.18 1
TOC

significant at p<0.01 and 0.05, respectively

0.78

significant at p<0.01 and 0.05, respectively

0.69

significant at p<0.01 and 0.05, respectively

0.97
−0.09 0.34 1
TIC 0.17 0.32 −0.14 0.46 −0.27 −0.18 1

Geochemical criteria of sediment pollution assessment (Bojakowska 2001)

Metal Classes of sediment pollution
0 I II III IV
geochemical background unpolluted moderately polluted polluted strongly polluted
(mg kg−1)
Zinc (Zn) 73 200 500 1000 >1000
Copper (Cu) 7 40 100 200 >200
Lead (Pb) 15 30 100 200 >200
Nickel (Ni) 5 16 40 50 >50
Cadmium (Cd) <0.5 1 3.5 6 >6

The land use in the direct catchments of the analyzed lakes

Lake Agricultural land (%) Wasteland (%) Building (%) Forest (%)
Biala Kuta 2.6 97.4
Krzywa Kuta 17.8 1.8 2.6 77.8
Kacze 100.0
Smolak 4.4 95.6
Łękuk 68.7 3.7 4.5 23.1
Wolisko 19.6 5.5 2.7 72.3
Pilwąg 5.2 1.1 0.5 93.2
Szwałk Wielki 20.6 2.8 1.1 75.4
Ciche 2.7 97.3
Szwałk Mały 38.8 9.6 1.2 50.4
Łaźno 40.7 12.2 5.4 41.7
Litygajno 15.9 12.5 2.2 69.4
Dubinek 100.0
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