Table 2
Mean (± standard deviation) environmental measurements (granulometry, distance to the mouth of the river (km), distance to a mangrove (km), water temperature (°C), salinity (PSU), pH, dissolved oxygen (mg.L−1 and %), turbidity (NTU), chlorophyll-a concentration (expressed by arbitrary units, AU) and abundance of different phytoplankton families (cell.L−1), no data (ND) were obtained at the stations 2 and 3) at stations 1, 2, 3 and 4 in April and October 2022 along the upstream-downstream gradient of the Sine Saloum estuary, Senegal. For some environmental parameters at station 4 during the monsoon season, only two values were available due to sensor malfunction, and thus no standard deviation could be calculated, those are indicated by (−).
| Station | Granulometry | Distance to the mouth of the river (km) | Distance to a mangrove (km) | Season | Water tempera-ture (°C) | Salinity (PSU) | pH | Dissolved oxygen (mg.L−1) | Dissolved oxygen (%) | Turbidity (NTU) | Chlorophyll- a (expressed by arbitrary units, AU) | Bacillerio-phycea (cell.L−1) | Dinoflagellates (cell.L−1) | Chloro-phycae (cell.L−1) | Cyano-phycae (cell.L−1) | Eugleno-phycae (cell.L−1) | Nanophyto-plancton (cell.L−1) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 | Coarse sand (shell debris) | 54.7 | 0.6 | Dry | 26.4 (±0.2) | 45.6 (±0.2) | 8.2 (±0.4) | 4.8 (±0.2) | 81.4 (±2.7) | 8.5 (±0.5) | 50.8 (±17.5) | 1.99 × 10+5 | 1.05 × 10+4 | 0 | 4.00 × 10+1 | 0 | 2.02 × 10+6 |
| Monsoon | 30.8 (±0.0) | 19.5 (±0.4) | 8.3 (±0.0) | 6.9 (±0.3) | 94.1 (±3.9) | 11.6 (±0.6) | 44.8 (±14.5) | 2.01 × 10+4 | 2.80 × 10+2 | 0 | 1.60 × 10+2 | 0 | 0 | ||||
| 2 | Sandy | 46.6 | 1.6 | Dry | 26.5 (±0.2) | 42.0 (±0.3) | 8.0 (±0.0) | 6.4 (±0.1) | 88.6 (±0.8) | 6.5 (±0.5) | 61.4 (±46.3) | ND | ND | ND | ND | ND | ND |
| Monsoon | 30.7 (±0.0) | 19.2 (±0.0) | 8.2 (±0.0) | 7.0 (±0.1) | 92.7 (±0.7) | 12.7 (±0.7) | 35.1 (±29.1) | ND | ND | ND | ND | ND | ND | ||||
| 3 | Sandy-muddy | 12.9 | 0.2 | Dry | 25.5 (±0.0) | 35.9 (±0.1) | 8.0 (±0.0) | 7.9 (±0.1) | 95.1 (±0.5) | 9.4 (±0.6) | 79.9 (±51.6) | ND | ND | ND | ND | ND | ND |
| Monsoon | 30.9 (±0.1) | 19.8 (±0.0) | 7.7 (±0.0) | 6.1 (±0.2) | 80.8 (±2.0) | 24.6 (±3.5) | 61.3 (±3.5) | ND | ND | ND | ND | ND | ND | ||||
| 4 | Sandy | 7.4 | 0.4 | Dry | 23.6 (±0.0) | 31.5 (±0.0) | 7.9 (±0.0) | 6.6 (±0.3) | 90.7 (±3.0) | 8.4 (±0.3) | 80.3 (±44.8) | 1.81 × 10+4 | 5.80 × 10+3 | 0 | 4.00 × 10+1 | 4.00 × 10+1 | 0 |
| Monsoon | 31.0 (±0.3) | 21.1 (±0.1) | 8.1 (−) | 7.7 (−) | 108.9 (−) | 13.6 (−) | 96.7 (−) | 2.66 × 10+4 | 2.50 × 10+3 | 8.00 × 10+1 | 1.28 × 10+3 | 0 | 9.22 × 10+5 |
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