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Table 2
Five groups of environmental variables included in Spearman correlation analysis (Abbrev. – abbreviation, Med – median, Min – minimum and Max – maximum) and the data transformations that we applied (Trans.).
| Group | Variable | Abbrev. | Unit | Med | Min | Max | Trans. |
|---|---|---|---|---|---|---|---|
| Landscape characteristics | Altitude | (Alt) | m | 292 | 101 | 526 | |
| ⁎Max depth | (Max_dp) | m | 17 | 4 | 87 | ln(x + 1) | |
| Mean depth | (Mean_dp) | m | 7 | 3 | 28 | ln(x + 1) | |
| ⁎Volume | (Vol) | m3 ⁎ 106 | 6.5 | 1.2 | 92.4 | ln(x + 1) | |
| Lake size | (Size) | km2 | 0.96 | 0.36 | 3.28 | ln(x + 1) | |
| Catchment size | (Catc) | km2 | 25.4 | 6.5 | 127.7 | ln(x + 1) | |
| Retention time | (t_ret) | days | 110 | 4 | 885 | ln(x + 1) | |
| Hydromorphological alteration | Littoral zone | (Z_Litt) | 0.35 | 0.00 | 0.85 | ||
| ⁎Shoreline zone | (Z_Shor) | 0.00 | 0.00 | 0.75 | |||
| Riparian zone | (Z_Rip) | 0.25 | 0.00 | 1.00 | |||
| Lake shore zone | (Z_LShor) | 0.25 | 0.00 | 1.00 | |||
| Lakeshore modification index | (LMI) | 0.89 | 0.15 | 2.66 | |||
| Lithal | 44 | 0 | 100 | arcsin(sqrtx) | |||
| FineSubs | 0 | 0 | 98 | arcsin(sqrtx) | |||
| Argyllal | 0 | 0 | 99 | arcsin(sqrtx) | |||
| Phytal | 3 | 0 | 100 | arcsin(sqrtx) | |||
| Xylal | 1 | 0 | 60 | arcsin(sqrtx) | |||
| POM | 1 | 0 | 90 | arcsin(sqrtx) | |||
| Land use | Urbanization | (URBAN) | % | 1 | 0 | 11 | arcsin(sqrtx) |
| Intensive agriculture | (I-AG) | % | 29 | 0 | 57 | arcsin(sqrtx) | |
| Extensive agriculture | (E-AG) | % | 19 | 1 | 31 | arcsin(sqrtx) | |
| ⁎Arable land | (FIE) | % | 25 | 0 | 54 | arcsin(sqrtx) | |
| Plantations | (PLANT) | % | 0 | 0 | 11 | arcsin(sqrtx) | |
| ⁎Natural areas | (NAT) | % | 49 | 25 | 99 | arcsin(sqrtx) | |
| Fish stocking | Piscivorous | (Pisci) | kg/ha | 3.36 | 0 | 18.53 | ln(x + 1) |
| Omnivorous | (Omni) | kg/ha | 3.57 | 0.00 | 1000 | ln(x + 1) | |
| Invertivorous–Piscivorous | (InvPisci) | kg/ha | 0.11 | 0.00 | 21.33 | ln(x + 1) | |
| Invertivorous | (Inv) | kg/ha | 0.01 | 0.00 | 11.38 | ln(x + 1) | |
| Herbi- and planktivorous | (HerPlank) | kg/ha | 0.00 | 0.00 | 2.38 | ln(x + 1) | |
| ⁎Stocked biomass | (kg/ha) | kg/ha | 14.89 | 0.00 | 1000 | ln(x + 1) | |
| Number of fish species | (NoFishSp) | number | 6.00 | 0.00 | 14.00 | ||
| Eutrophication | ⁎Secchi depth | (SecD) | cm | 1.96 | 0.22 | 9.78 | ln(x + 1) |
| Total phosphorous | (TP) | μg PO4-P/l | 27.7 | 3.5 | 224.0 | ln(x + 1) | |
| Orthophosphate | (PO4) | μg PO4-P/l | 2.5 | 0.8 | 191.8 | ln(x + 1) | |
| Nitrate | (NO3) | μg NO3-N/l | 0.59 | 0.14 | 4.53 | ln(x + 1) | |
| Ammonium | (NH4) | μg NH4-N/l | 108 | 5 | 811 | ln(x + 1) | |
| Total nitrogen | (TN) | mg N/l | 0.80 | 0.08 | 6.95 | ln(x + 1) | |
| ⁎Chlorophyll a | (Chl_a) | μg/l | 5.8 | 0.9 | 61.4 | ln(x + 1) |
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