Table 3.
Pollution index of algal genera according to Palmer (1969) at 8 sites of ISSF.
| Microalgae | K1 | K2 | K3 | K4 | K5 | K6 | K7 | K8 |
|---|---|---|---|---|---|---|---|---|
| Chlorophyceae | ||||||||
| Chlorella sp. | 3 | 3 | 3 | 3 | 3 | 3 | 3 | 3 |
| Kirchneriella sp. | − | − | − | − | − | − | − | + |
| Chlamydomonas sp. | − | − | − | − | − | − | − | 4 |
| Cyanophyceae | ||||||||
| Chroococcus sp. | + | + | + | + | + | + | − | + |
| Gloeocapsa sp. | − | − | + | − | − | − | − | − |
| Stephanodiscus sp. | − | + | − | − | + | + | − | − |
| Bacillariophyceae | ||||||||
| Nitzschia sp. | − | − | − | 3 | − | − | 3 | − |
| Navicula sp. | − | − | − | − | − | 3 | − | − |
| Zygnemathophyceae | ||||||||
| Spirogyra sp. | − | + | − | − | + | − | − | + |
| Trebouxiophyceae | ||||||||
| Dictyosphaerium sp. | − | + | + | − | − | + | − | − |
| Total score | 3 | 3 | 3 | 6 | 3 | 6 | 6 | 7 |
Key: numerical values for pollution classification of Palmer are 0–10 (lack of organic pollution); 10–15 (moderate pollution); 15–20 (probable high organic pollution); 20 or more (confirmed high organic pollution); + (present); − (not present).