Open Access
Table 4
Seasonal variations in environmental variables and Trophic State Index (TSI) of water in Baskandi anua with one way ANOVA.
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| Parameters | Winter | Pre monsoon | monsoon | Post monsoon | F-ratio |
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| Rainfall (mm) | 1.80 ± 3.12 | 303.37 ± 143.73 | 506.67 ± 135.74 | 207.47 ± 261.09 | 0.296 |
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| Water depth (m) | 41.17 ± 6.32 | 41.65 ± 29.39 | 58.67 ± 12.84 | 42.56 ± 9.27 | 0.752 |
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| Air temperature ( ° C) | 27.20 ± 2.08 | 26.10 ± 1.25 | 27.40 ± 0.96 | 29.26 ± 1.03 | 4.37 |
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| Water temperature ( ° C) | 22.20 ± 1.04 | 25.02 ± 1.17 | 26.40 ± 0.96 | 28.06 ± 0.56 | 33.30* |
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| Transparency (cm) | 36.05 ± 0.92 | 14.71 ± 3.40 | 24.60 ± 4.74 | 9.90 ± 0.96 | 240.87* |
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| pH | 7.24 ± 0.23 | 6.31 ± 0.07 | 5.88 ± 0.07 | 6.93 ± 0.09 | 106.68* |
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| Conductivity (mS · cm -1 ) | 1.31 ± 0.047 | 0.91 ± 0.11 | 0.54 ± 0.03 | 1.27 ± 0.10 | 10.50* |
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| Dissolved oxygen (mg · L -1 ) | 9.80 ± 0.66 | 7.28 ± 0.29 | 9.35 ± 0.67 | 10.17 ± 0.13 | 33.78* |
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| Biological oxygen demand | 3.60 ± 1.14 | 3.69 ± 1.39 | 2.03 ± 1.36 | 3.56 ± 1.75 | 1.56 |
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| Free carbon dioxide | 3.39 ± 1.67 | 2.79 ± 1.09 | 2.20 ± 0.83 | 6.72 ± 2.22 | 8.50* |
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| Total alkalinity (mg · L -1 ) | 35.08 ± 1.48 | 44.83 ± 8.34 | 52.25 ± 3.44 | 35.40 ± 2.70 | 15.00* |
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| Total Hardness(mg · L -1 ) | 42.80 ± 7.95 | 45.20 ± 4.15 | 50.40 ± 4.10 | 43.60 ± 3.29 | 2.16 |
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| Calcium (mg · L -1 ) | 8.50 ± 0.94 | 14.59 ± 1.74 | 15.25 ± 2.31 | 11.86 ± 2.97 | 11.54* |
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| Magnesium (mg L -1 ) | 14.24 ± 5.70 | 5.80 ± 2.21 | 7.65 ± 5.41 | 9.23 ± 2.95 | 3.62 |
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| Chloride (mg · L -1 ) | 12.33 ± 1.08 | 26.24 ± 0.85 | 21.07 ± 2.08 | 20.87 ± 1.99 | 62.61* |
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| Phosphate (mg · L -1 ) | 0.05 ± 0.06 | 0.06 ± 0.04 | 0.07 ± 0.05 | 0.04 ± 0.05 | 0.549 |
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| Nitrate (mg · L -1 ) | 0.41 ± 0.12 | 0.53 ± 0.07 | 0.71 ± 0.03 | 0.65 ± 0.10 | 12.64* |
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| Ammonia-N (mg · L -1 ) | 1.92 ± 0.37 | 0.19 ± 0.05 | 0.46 ± 0.04 | 0.55 ± 0.06 | 82.35* |
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| TSI | 63.40 ± 7.24 | 70.12 ± 2.64 | 71.32 ± 2.92 | 73.23 ± 1.24 | 5.22 |
(Mean ± SD; n = 20) *p< 0.01.
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