Table 1
Environmental variables measured across study years (2010–2014) for each site along the Niobrara River. Site abbreviations include: East = Agate East, Middle = Agate Middle, and Ranch = Agate Springs Ranch. Variable abbreviations include: Tw = water temperature (°C), Tair = air temperature (°C), DO = dissolved oxygen (mg/L), SPC = specific conductivity (μS/cm), ORP = oxidation–reduction potential (mV), D = depth (cm), W = total wetted width (m) including the floodplain, and Dis. = discharge (m3/s). Variables are averaged between the initial and final visits.
| Site | Year | Tw | Tair | % DO | DO | SPC | pH | ORP | Secchi | D | W | Dis. |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| East | 2010 | 18.0 | 28 | 69 | 5.6 | 442.1 | 7.8 | 163.7 | 97.0 | 92.4 | 2.7 | – |
| East | 2011 | 19.6 | 26 | 98 | 7.7 | 417.0 | 7.9 | 47.8 | 25.5 | 65.3 | – | – |
| East | 2012 | 26.0 | 37 | 102 | 8.0 | 304.0 | 8.0 | 200.0 | 45.0 | 58.1 | 2.2 | 0.21 |
| East | 2013 | 20.0 | 21 | 69 | 6.0 | 392.0 | 8.0 | 167.0 | 73.0 | 41.8 | 3.4 | 0.11 |
| East | 2014 | 21.0 | 33 | 76 | 7.0 | 351.0 | 7.0 | 193.0 | 77.0 | 50.8 | 2.3 | 0.11 |
| Middle | 2010 | 19.5 | 19 | 80 | 6.3 | 437.5 | 7.8 | 108.3 | 60.0 | 54.4 | 3.0 | – |
| Middle | 2011 | 20.7 | 34 | 116 | 8.9 | 418.6 | 7.9 | 48.3 | 39.0 | 45.7 | – | – |
| Middle | 2012 | 23.9 | 35 | 113 | 9.7 | 307.7 | 8.1 | 196.9 | 27.5 | 35.3 | 2.2 | 0.11 |
| Middle | 2013 | 22.1 | 26 | 71 | 6.4 | 384.5 | 7.5 | 163.1 | 68.0 | 46.5 | 6.8 | 0.07 |
| Middle | 2014 | 21.3 | 28 | 53 | 4.7 | 343.4 | 7.4 | 78.1 | 70.5 | 67.7 | 4.2 | 0.08 |
| Ranch | 2010 | 20.2 | 27.5 | 94 | 7.2 | 418.3 | 8.2 | 185.4 | 64.0 | 59.3 | 2.2 | – |
| Ranch | 2011 | 21.0 | 34 | 116 | 8.8 | 414.1 | 8.1 | 90.7 | 40.0 | 55.3 | – | – |
| Ranch | 2012 | 20.7 | 35 | 97 | 8.8 | 318.6 | 8.2 | 199.6 | 52.0 | 47.1 | 2.7 | 0.17 |
| Ranch | 2013 | 19.5 | 24 | 99.5 | 9.3 | 394.7 | 8.1 | 193.3 | 48.9 | 48.2 | 3.1 | 0.16 |
| Ranch | 2014 | 21.2 | 25.5 | 70 | 6.2 | 348.3 | 7.8 | 71.7 | 69.5 | 53.1 | 2.7 | 0.17 |
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