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Table 1 Mean values and range of physicochemical variables at the two studied sites (Northwestern Patagonia Argentina)

From: Biological traits and community patterns of Trichoptera at two Patagonian headwater streams affected by volcanic ash deposition

  Nanty Fall Chiquito
  Pre-eruption Post-eruption Pre-eruption Post-eruption
Water temperature (°C) 11.6 (3.9 to 22.5) 12.6 (5.3 to 20.8) 8 (2.4 to 13.1) 7.6 (2.7 to 12.6)
Channel wetted width (m) 17.1 (14 to 22.7) 22 (18.2 to 27) 2.7 (2 to 3.1) 2.2 (1.5 to 2.5)
Channel dry width (m) 31.5 31.5 3.5 3.5
Depth (cm) 20.9 (15.6 to 32.6) 29 (19.5 to 38.4) 12.7 (9 to 20) 12.4 (7.9 to 17.7)
Current velocity (m/seg) 0.7 (0.5 to 1.16) 0.7 (0.5 to 0.8) 0.7 (0.4 to 1.18) 1 (0.6 to 1.6)
Discharge (m3/seg) 3.2 (1.31 to 7.21) 4.1 (2.31 to 4.7) 0.2 (0.1 to 0.6) 0.3 (0.1 to 0.5)
Conductivity (μS/cm) 89.7 (72.3 to 119.4) 94.6 (76.3 to 107.8) 52 (29.4 to 104.7) 55.3 (42.8 to 73.2)
Dissolved oxygen (mg/l) 9.7 (7.06 to 13.23) 10.5 (7.7 to 12.7) 7.2 (7.2 to 15.4) 10.3 (6.6 to 13.7)
pH 7.6 (6.5 to 8.5) 7.6 (6.4 to 8.6) 7.3 (6.8 to 8) 7.3 (6.2 to 8.1)
Total suspended solids (mg/l) 2.7 (1.7 to 3.6)a 10.25 (7 to 13.5) 4 (2 to 6.1)a 12.8 (1.3 to 24.1)
  1. At pre- (May 2007 to April 2008) and post-eruption dates (June 2008 to March 2010); apre-eruption values for total suspended solids taken from Miserendino et al. ([2012]).