Table 1. Physico-chemical characteristics of Lagunita prior to mesocosm installation in May 2011 (day 0), after 3-weeks of fertilizer application (day 21) and 3-weeks after fertilizer application was ceased (day 42).
| Parameters | Day 0 | Day 21 | Day 42 |
|---|---|---|---|
| Water column depth (cm) a | 20–32 | 13–27 | 12–26 |
| Temperature (°C) b | 21.5–39.7 | ||
| pH c | 7.96 | 8.18 | 8.20 |
| Conductivity (mS cm-1) c | 9.17 | 11.50 | 9.40 |
| Salinity (ppt) c | 5.2 | 6.9 | 5.8 |
| Chlorophyll a (μg L-1) | 15.3 ± 1.16 | 6.91 ± 0.98 | 31.3 ± 3.29 |
| DOC | 2177 ± 51.84 | 3578 ± 54.84 | 5787 ± 236 |
| Nitrate/Nitrite | 1.67 ± 0.34 | 0.98 ± 0.21 | 1.70 ± 0.60 |
| Ammonia-N | 1.07 ± 0.10 | 0.76 ± 0.05 | 0.88 ± 0.38 |
| SRP | 0.06 ± 0.02 | 0.27 ± 0.03 | 0.25 ± 0.07 |
| TDN | 130 ± 5.98 | 224 ± 6.39 | 309 ± 4.48 |
| TDP | 0.58 ± 0.17 | 1.16 ± 0.34 | 1.22 ± 0.26 |
| Seston C | 498 ± 34.45 | 778 ± 37.19 | 778 ± 42.64 |
| Seston N | 57.1 ± 2.81 | 93.9 ± 4.32 | 96.5 ± 8.21 |
| Seston P | 1.21 ± 0.08 | 1.77 ± 0.19 | 2.25 ± 0.13 |
| Total N | 187 ± 8.58 | 318 ± 8.52 | 405 ± 10.4 |
| Total P | 1.79 ± 0.20 | 2.93 ± 0.34 | 3.47 ± 0.29 |
| Calcium ions (mmol L-1) | 17.9 ± 1.15 | 17.5 ± 0.37 | 15.4 ± 0.61 |
| Sulfate ions (mmol L-1) | 486 ± 63.44 | 678 ± 18.76 | 956 ± 62.29 |
| Sediment C (g C kg-1 sed) | 87.5 ± 1.39 | 99.4 ± 0.33 | N.D. |
| Sediment N (mmol N kg-1 sed) | 248 ± 54.3 | 264 ± 33.5 | 213 ± 41.1 |
| Sediment P (mmol P kg-1 sed) | 1.48 ± 0.20 | 1.28 ± 0.10 | N. D. |
Values indicate the average of five measurements along the east-west transect ± 1 standard deviation. All values are in μmol L-1 unless otherwise stated. DOC: Dissolved organic carbon, SRP: Soluble reactive phosphorus, TDN: Total dissolved nitrogen, TDP: Total dissolved phosphorus. N.D.; Not determined.
a Range from five location.
b Range obtained from 24 hours continuous temperature loggers.
c No replicate readings were taken.