TABLE 3.
Season, climate, and water physical and chemical data used to predict Simpson indexes using CARTa
| Variable name(s) | Variable description (unit) |
|---|---|
| SEASON | Season, determined by solstice and equinox dates |
| AMIA_AMN | NH3 (ammonia) + ammonium concn in sample water (mg liter−1) |
| NITRITE | NO2− (nitrite) concn in sample water (mg liter−1) |
| NITRATE | NO3− (nitrate) concn in sample water (mg liter−1) |
| REA_PHOS | Reactive phosphorus concn in sample water |
| TOTKN | Total Kjeldahl nitrogen concn in sample water (mg liter−1) |
| TOTPHO | Total phosphorus concn in sample water (mg liter−1) |
| TEMP | Temp of water at time of sample collection (°C) |
| pH | pH of water at time of sample collection |
| CONDUCTIVITY | Electrical conductivity of water at time of sample collection (mS cm−1) |
| DISS_OXYGEN_P, DISS_OXYGEN_MGL | Gaseous O2 dissolved in sample water (mg liter−1), measured as a percentage of saturation and in mg liter−1 |
| ORP | Oxidation reduction potential (mV) |
| TURBIDITY | Cloudiness of sample water as measured with a nephelometer sensor (nephelometric turbidity units) |
| DIS_SPC, DIS_PAY, DIS_RUS | River discharge at Spencerville, Payne, and Russell hydrometric stations, respectively (m3 s−1) |
| RUS_TOTALRAIN, RUS_TOTALRAINXD | Total rainfall on day of sampling (mm); total rainfall x = 1, 2, 3, and 7 days in advance of sampling at the Russell meteorological station (mm) |
| RUS_MAXTEMP, RUS_MINTEMP, | |
| RUS_MEANTEMP | Daily maximum, minimum, and mean temp (°C) at Russell and daily avg temp (°C) |
a
Physical and chemical analyses were undertaken on the same water samples as those used for microbiological analyses.