Table 5.
Concentrations of microcystins produced by Planktothrix agardhii-rubescens in Flumendosa and Mulargia reservoirs at different depths from four sampling dates.
| Reservoirs | Date | Depth (m) | Density (×106 cells L−1) | MCYSTs (in)* (µg/L) | MCYSTs (ex)** (µg/L) | MCYSTs (tot)*** (µg/L) |
|---|---|---|---|---|---|---|
| Flumendosa | March 2011 | 1.0 | 85 | 1.3 | 0.4 | 1.6 |
| 2.5 | 84 | 1.4 | 0.4 | 1.5 | ||
| 5.0 | 76 | 1.1 | 0.2 | 1.3 | ||
| 10.0 | 119 | 1.0 | 0.2 | 1.2 | ||
| Mulargia | March 2010 | 0.0 | 55 | 2.9 | 0.0 | 2.9 |
| 1.0 | 59 | 2.7 | 0.0 | 2.7 | ||
| 2.5 | 59 | 2.0 | 0.0 | 2.0 | ||
| 5.0 | 40 | 1.6 | 0.0 | 1.6 | ||
| 7.5 | 25 | 2.5 | 0.0 | 2.5 | ||
| 10.0 | 32 | 2.1 | 0.0 | 2.1 | ||
| 15.0 | 26 | 1.7 | 0.0 | 1.7 | ||
| 20.0 | 22 | 2.3 | 0.0 | 2.3 | ||
| March 2012 | 2.5 | 44 | 1.3 | 0.3 | 1.6 | |
| 7.5 | 48 | 1.3 | 0.3 | 1.6 | ||
| 10.0 | 52 | >5.0 | 0.4 | >5.0 | ||
| 15.0 | 34 | 1.6 | 0.3 | 1.9 | ||
| May 2012 | 7.5 | 42 | 2.7 | 0.2 | 3.0 | |
| 10.0 | 105 | >5.0 | 0.4 | >5.0 | ||
| 15.0 | 81 | 1.7 | 0.3 | 2.0 | ||
| 20.0 | 76 | 1.2 | 0.3 | 1.4 |
* MCYSTs (in) = Intracellular microcystins concentration; ** MCYSTs (ex) = Extracellular microcystins concentration; and ***MCYSTs (tot) = Total microcystins concentration.