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Table 1 Physico-chemical parameters, annual mean standard deviation, and total range values from NyF and CVA streams (Patagonia, Argentina)

From: Selective foraging by non-native rainbow trout on invertebrates in Patagonian streams in Argentina

  NyF CVA
Physical parameters Mean ± SD Range Mean ± SD Range
  Water temperature (°C) 10.4 ± 2.7 7.6 to 13.6 6.5 ± 2.4 4.0 to 9.4
  Wet width (m) 21.1 ± 3.1 17.5 to 25.0 7.2 ± 2.9 4.6 to 11.0
  Depth (m) 0.2 ± 0.1 0.19 to 0.32 0.2 ± 0.0 0.20 to 0.28
  Water velocity (ms−1) 0.8 ± 0.2 0.68 to 1.0 1.1 ± 0.2 0.93 to 1.15
  Discharge (m3 s−1) 4.6 ± 2.4 2.71 to 8.0 1.9 ± 0.9 0.92 to 3.08
Substrate composition (%)
  Boulder 20   15  
  Cobble 25   30  
  Pebble 10   15  
  Gravel 30   25  
  Sand 15   15  
Chemical parameters Mean ± SD Range Mean ± SD Range
  Conductivity (μS cm−1) 114.0 ± 2.7 112.0 to 118.0 50.0 ± 14.0 38.0 to 63.0
  Dissolved oxygen (mg l−1) 8.8 ± 1.6 7.7 to 11.1 11.1 ± 1.7 9.7 to 13.0
  pH 7.6 ± 0.4 7.2 to 7.9 7.3 ± 0.1 7.1 to 7.4
  Turbidity (TNU) 4.2 ± 3.9 2.0 to 10.0 10.0 ± 15.0 0 to 27.0
  Ammonium (μg L−1) 1.05 ± 0.5 0.6 to 1.6 0.86 ± 0.7 0 to 1.7
  Nitrate + nitrite nitrogen (μg L−1) 0.18 ± 0.2 0.1 to 0.3 0.17 ± 0.2 0 to 0.3
  Soluble reactive phosphate (μg L−1) 0.37 ± 0.0 0.3 to 0.4 0.53 ± 0.2 0.2 to 0.7
  Total suspended solids (mg L−1) 2.74 ± 0.8 1.7 to 3.6 2.38 ± 1.8 0.7 to 4.4
  1. During the study period (early autumn, late winter, late spring of 2005, and late summer of 2006). SD, standard deviation.