Properties of the physical environment and concentration dilution associated with chemical stimulus input and delivery
| . | . | Percentile . | . | |
|---|---|---|---|---|
| Variable* . | Median . | 10th . | 90th . | |
| Pool size (surface area, m2) | 4.02 | 0.40 | 5.05 | |
| Maximum pool depth (m) | 0.38 | 0.18 | 0.59 | |
| pH | 8.02 | 7.84 | 8.10 | |
| Conductivity (μS) | 1146 | 1123 | 1175 | |
| Temperature (°C) | 17.8 | 17.1 | 18.5 | |
| Light intensity (μmol m-2 s-1) | 15.8 | 13.2 | 21.1 | |
| Stimulus dilution factor (×10-4) | 2.62 | 1.13 | 4.22 | |
| Flow, along channel (cm s-1) | ||||
| Speed (u) | 2.6 | 2.0 | 3.6 | |
| Fluctuating component(u′)† | 0.6 | 0.4 | 1.0 | |
| Flow, vertical (cm s-1) | ||||
| Speed (w) | 0.5 | 0.1 | 1.2 | |
| Fluctuating component(w′)† | 0.5 | 0.3 | 0.7 | |
| . | . | Percentile . | . | |
|---|---|---|---|---|
| Variable* . | Median . | 10th . | 90th . | |
| Pool size (surface area, m2) | 4.02 | 0.40 | 5.05 | |
| Maximum pool depth (m) | 0.38 | 0.18 | 0.59 | |
| pH | 8.02 | 7.84 | 8.10 | |
| Conductivity (μS) | 1146 | 1123 | 1175 | |
| Temperature (°C) | 17.8 | 17.1 | 18.5 | |
| Light intensity (μmol m-2 s-1) | 15.8 | 13.2 | 21.1 | |
| Stimulus dilution factor (×10-4) | 2.62 | 1.13 | 4.22 | |
| Flow, along channel (cm s-1) | ||||
| Speed (u) | 2.6 | 2.0 | 3.6 | |
| Fluctuating component(u′)† | 0.6 | 0.4 | 1.0 | |
| Flow, vertical (cm s-1) | ||||
| Speed (w) | 0.5 | 0.1 | 1.2 | |
| Fluctuating component(w′)† | 0.5 | 0.3 | 0.7 | |
Data are combined for 35 stream pools along a 4-km stretch of Tuna Canyon Creek (Malibu, California, USA), between April and November 2004.
In each 10-min sampling period, stream water temperature, conductivity and pH, were recorded 2 cm above the bed at 0.1 Hz. Simultaneously, light intensity was measured at 0.1 Hz on the surface of the stream bed. Pool size was determined from digital images by computer analysis.
Calculated as the standard deviation (root mean square) using repeated measurements (600 electromagnetic current meter recordings) taken over 10-min intervals.