Figure 1
Figure 2
Figure 3
Figure 4
Figure 5
Figure 6
Stepwise regression analysis results for the Kabul River sampling sites
| Dependent variables | Step 1 | Step 2 | Step 3 |
|---|---|---|---|
| Number of Species | T <0.05; | T, Cond <0.01; | T, Cond, Hard <0.001 |
| Cyanobacteria | T <0.05; | T, DO <0.05; | T, Sal, DO |
| Chlorophyta | T <0.05; | T, Cond <0.05; | T, Cond, Hard |
| Xanthophyta | T <0.05; | T, SO4 <0.01; | T, SO4, NH4 |
| Euglenophyta | pH <0.05; | pH, Turb <0.05; | pH, DO, Turb |
Ecological preferences of the most distributed algal species-indicators in the Kabul River
| Taxa | Hab | T | Oxy | Sal | Wat | Sap | Index S | Tro | Nutr |
|---|---|---|---|---|---|---|---|---|---|
| Cyanobacteria | |||||||||
| Chroococcus turgidus (Kützing) Nägeli | P-B, S | - | aer | hl | - | x-b | 0.8 | - | - |
| Bacillariophyta | |||||||||
| Cymbella affinis Kützing | B | temp | st-str | i | sx | o | 1.1 | ot | ats |
| Diatoma vulgaris Bory | P-B | - | st-str | i | sx | b | 2.2 | me | ate |
| Rhoicosphenia abbreviata (C. Agardh) Lange-Bertalot | B | - | st-str | i | es | o-a | 1.9 | me | ate |
| Chlorophyta | |||||||||
| Cladophora glomerata (Linnaeus) Kützing var. glomerata | P-B | - | st-str | i | - | o-a | 1.9 | - | - |
| Hydrodictyon reticulatum (Linnaeus) Bory | P-B | - | st | - | - | o-a | 1.8 | - | - |
The 100-point index ranges according to Mitchell and Stapp (1992)
| Class | Range | Quality |
|---|---|---|
| 1 | 90-100 | Excellent |
| 2 | 70-90 | Good |
| 3 | 50-70 | Medium |
| 4 | 25-50 | Bad |
| 5 | 0-25 | Very Bad |
Water variables over the study sites in the Kabul River
| Parameter | Unit | Warsak | Sardaryab | Nowshera | Khairabad | RPI |
|---|---|---|---|---|---|---|
| Temperature | °C | 18 | 19.6 | 20.8 | 22 | 20.2 |
| pH | 7.4 | 7.9 | 7.3 | 7.8 | 7.6 | |
| Conductivity | mSm cm-1 | 263 | 268 | 377 | 471 | 340.6 |
| Turbidity | NTU | 3 | 4 | 9 | 7 | 6.1 |
| T.D.S. | mg l-1 | 110 | 135 | 212 | 190 | 168.1 |
| T.S.S. | 220 | 230 | 280 | 264 | 252.1 | |
| Salinity | 0.2 | 0.6 | 1.3 | 2.0 | 1.0 | |
| Alkalinity | mg Eq l-1 | 75 | 101 | 157 | 166 | 128.2 |
| Hardness | 167 | 144 | 155 | 180 | 157.4 | |
| D.O. | mg l-1 | 6.5 | 5.59 | 6.78 | 6.5 | 6.3 |
| B.O.D. | mg O2 l-1 | 0.8 | 1.4 | 5.4 | 6 | 3.5 |
| NO2- | mg l-1 | 0.00 | 0.03 | 0.03 | 0.38 | 0.1 |
| NO3- | 2.81 | 6.48 | 1.64 | 4.87 | 4.0 | |
| NH3-N | 0.00 | 0.13 | 0.54 | 1.92 | 0.6 | |
| S2- | 0.16 | 0.33 | 0.36 | 0.80 | 0.4 | |
| SO42- | 26 | 23.25 | 25.6 | 59.5 | 30.6 | |
| PO43- | 0.14 | 0.26 | 0.15 | 1.14 | 0.4 | |
| Cl- | 7 | 8 | 12 | 18 | 11.0 | |
| Saprobity Index S | 1.55 | 1.55 | 1.59 | 1.59 | 1.571 | |
| WESI Index | 0.50 | 0.44 | 0.67 | 0.44 | 0.532 | |
| WQI Index | 54.67 | 50.16 | 39.39 | 46.36 | 46.33 |
Biodiversity data over the study sites in the Kabul River
| Division | Warsak | Sardaryab | Nowshera | Khairabad |
| Abundance, total scores | ||||
| Cyanobacteria | 65 | 80 | 79 | 91 |
| Bacillariophyta | 46 | 58 | 64 | 63 |
| Xanthophyta | 25 | 25 | 35 | 35 |
| Euglenophyta | 4 | 7 | 5 | 5 |
| Chlorophyta | 92 | 135 | 142 | 149 |
| Charophyta | 203 | 236 | 231 | 248 |
| Sum of Scores | 435 | 541 | 556 | 591 |
| Number of Species | ||||
| Cyanobacteria | 22 | 28 | 29 | 32 |
| Bacillariophyta | 26 | 34 | 36 | 36 |
| Xanthophyta | 5 | 5 | 7 | 7 |
| Euglenophyta | 3 | 6 | 5 | 5 |
| Chlorophyta | 24 | 36 | 37 | 39 |
| Charophyta | 47 | 58 | 56 | 60 |
| No of Species | 127 | 167 | 170 | 179 |