Fig 2. Fish spatial distribution based on environmental variables (Survey 1).

The breeding season is represented in green and the non-breeding season in gray; dark green sections implies overlap of both seasons. A. Frequency distribution versus DNN(in cm). B. Frequency distribution versus O₂ concentration (in mg/l) measured at 30 cm from the surface in each individual spot. C. Linear regression of DNN and O₂ concentration in individual spots (Log transformed). Breeding season: R² = 0.44, p = 1 exp -4, N = 35; non-breeding season: R² = 0.21, p = 1 exp-4, N = 50. D. Linear regression of EOD rate and water oxygen concentration in individual spots. Breeding season: R² = 0.47, p = 5 exp-4, N = 22; non-breeding season: R² = 1 exp-3, p = 0.54, N = 39.