Table 1.
Hydrological, physicochemical, microbial, and biotic characteristics of the sampling site.
| February 2012 | March 2013 | May 2013 | August 2014 | February 2015 | June 2015 | October 2015 | November 2015 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hydrological and physico-chemical parameters | ||||||||||||||||
| Flow ratea | 385 m3.s-1 | 877 m3.s-1 | 1090 m3.s-1 | 366 m3.s-1 | 1144 m3.s-1 | 226 m3.s-1 | 217 m3.s-1 | 199 m3.s-1 | ||||||||
| Pluviometryb | 2.8 mm | 6.4 mm | 35.4 mm | 37 mm | 20.7 mm | 16.9 mm | 13.4 mm | 6.6 mm | ||||||||
| Salinity | 1.3 | 0.2 | 0 | 0.6 | 0 | 8.3 | 5.2 | 2.8 | ||||||||
| Temperature | 7°C | 7.2°C | 15°C | 19.5°C | 5.4°C | 19.8°C | 15.4°C | 12°C | ||||||||
| Conductivity | 1784 μS.cm-1 | 784 μS.cm-1 | NA | 1400 μS.cm-1 | 477 μS.cm-1 | 13086 μS.cm-1 | 8896 μS.cm-1 | 4012 μS.cm-1 | ||||||||
| SPMc | 100 mg.L-1 | 50 mg.L-1 | 10 mg.L-1 | 68 mg.L-1 | 88 mg.L-1 | 76 mg.L-1 | 81 mg.L-1 | 185 mg.L-1 | ||||||||
| Microbiological quality | ||||||||||||||||
| Waterd | Fluid mude | Water | Fluid mud | Water | Fluid mud | Water | Fluid mud | Water | Fluid mud | Water | Fluid mud | Water | Fluid mud | Water | Fluid mud | |
| E. coli | NA | NA | 7.0 ± 0.2 × 101 | 6.1 ± 0.7 × 100 | NA | 5.5 ± 0.3 × 101 | 1.1 ± 0.2 × 102 | 2.1 ± 1.2 × 101 | 3.0 ± 1.4 × 101 | 3.5 ± 0.9 × 102 | 6.2 ± 0.1 × 101 | <5.0 101f | 2.3 ± 0.4 × 102 | 3.9 ± 1.6 × 101 | 5.0 ± 1.0 × 101 | 6.6 ± 2.0 × 100 |
| Enterococci | 2.0 × 101 | NA | 5.0 ± 0.5 × 101 | 6.5 ± 0.3 × 100 | NA | 5.7 ± 1.5 × 101 | 2.5 ± 0.7 × 101 | 5.0 ± 5.0 × 100 | 2.6 ± 0.4 × 102 | 5.2 ± 0.9 × 102 | <5.0 101f | 2.6 ± 0.5 × 101 | 7.5 ± 3.5 × 101 | 3.6 ± 0.4 × 101 | <5.0 × 101f | 8.0 ± 3.0 × 101 |
| Copepods | ||||||||||||||||
| Eurytemora affinis | + | + | - | + | NS | NS | + | NS | ||||||||
Surface water (-50 cm below the surface) and fluid mud were sampled in the mouth of the Seine Estuary at Tancarville site (N 49° 28′ 30.26″ E 0° 27′ 48.65″). aAverage daily flow rate (GIP Seine-Aval database); bcumulated rainfall 7 days before the sampling (Météo France database); cSuspended Particulate Matter (wet weight); dCFU.100 mL-1; eCFU.g-1 (wet weight); fcount below the detection threshold; NA: not analyzed; NS: not sampled.