Table 2
Seasonal mean and standard deviation values of physicochemical variables in each stratum during 2005 and 2006. Data for light intensity was not obtained in 2006 due to technical challenges with light meter. Epilimnion (n) = 255, metalimnion (n) = 153, hypolimnion (n) = 153. Light intensity for stratified season (n) = 22, mixing season (n) = 19 and Secchi depth (n) = 4.
| Physicochemical variable | Stratified | Mixing | Restratifying | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Epi. | Meta. | Hypo. | Epi. | Meta. | Hypo. | Epi. | Meta. | Hypo. | |
| 2005 | |||||||||
| Temperature (°C) | 30.37 ± 1.01 | 27.59 ± 0.39 | 27.11 ± 0.17 | 27.46 ± 0.55 | 27.29 ± 0.37 | 27.08 ± 0.26 | 28.59 ± 1.31 | 27.04 ± 0.22 | 26.8 ± 0.01 |
| Phyto. biomass (mg wt m−3) | 688 ± 367 | 443 ± 231 | 208 ± 201 | 1644 ± 1108 | 1219 ± 791 | 667 ± 546 | 2953 ± 1569 | 986 ± 665 | 470 ± 359 |
| DO (mg L−1) | 6.73 ± 2.11 | 0.59 ± 0.61 | 0.44 ± 0.61 | 3.63 ± 0.63 | 4.02 ± 1.30 | 1.50 ± 1.51 | 5.02 ± 2.51 | 0.91 ± 1.01 | 0.37 ± 0.33 |
| Light intensity | 195.50 ± 260.99 | 0 | 0 | 344.3 ± 328.46 | 0 | 0 | 0 | 0 | 0 |
| Secchi depth | 1.75 ± 0.17 | 0 | 0 | 1.35 ± 0.1 | 0 | 0 | 1.05 ± 0.28 | 0 | 0 |
| 2006 | |||||||||
| Temperature (°C) | 30.50 ± 0.71 | 28.30 ± 0.69 | 27.00 ± 0.19 | 28.50 ± 0.58 | 27.97 ± 0.67 | 27.20 ± 0.29 | 28.82 ± 0.93 | 27.55 ± 0.21 | 27.22 ± 0.10 |
| Phyto. biomass (mg wt m−3) | 1970 ± 1085 | 726 ± 312 | 385 ± 174 | 2050 ± 952 | 1302 ± 846 | 396 ± 219 | 2744 ± 1238 | 1126 ± 515 | 447 ± 283 |
| DO (mg L−1) | 6.33 ± 1.58 | 2.92 ± 2.66 | 2.33 ± 2.88 | 6.88 ± 1.69 | 5.15 ± 3.43 | 2.36 ± 2.69 | 8.33 ± 2.06 | 1.76 ± 1.65 | 0.12 ± 0.02 |
| Secchi depth | 1.70 ± 0.2 | 0 | 0 | 1.53 ± 0.3 | 0 | 0 | 1.35 ± 0.19 | 0 | 0 |
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