Tab. 1. Physical and chemical characteristics measured for Charcote and Charcotico during four survey periods. DO was not measured during November and December. January was the low-water period, September was near the peak of the annual flood pulse, and during November and December floodwaters were gradually receding.
Parameter September November December January
Charcotico Charcote Charcotico Charcote Charcotico Charcote Charcotico Charcote
Water temperature (°C) 28 27 27 28 26 27.5 29 30
Air temperature (°C) 30 26 28 27 30.5 30 26 34
pH 5.5 5.5 6 5 5.5 5.5 5.5 5.75
Water velocity (m/s) 0.12 0.45 0.39 0.39 0.3 0.39 0 0
DO (mg/L) 6 6 5 4
Max. water depth (m) 1.22 2.27 1.16 2.15 1.1 1.65 0.5 1.25
% Aquatic vegetation 0 0 0 50 0 75 0 20
% Canopy cover 4 5 5 5 2 3 2 0
Secchi depth (m) 1.22 2.27 1.16 2 0.5 0.4 0.2 0.35