3.3. Physicochemical parameters
All the FLA were found at relatively low temperatures (4.9–16.9 °C), in slow to fast flowing waters (0.001–1.09 m3 s−1) that were moderately acidic to alkaline (pH 6.0–8.0) and with relatively low ionic content (30.6–150 μS cm−1). Oxygen saturation was high (80–127%). Conditions varied according to trophic level: DRP 0.19–0.8 mg L−1, nitrites 0.002–0.8 mg L−1, nitrates 0.002–0.8 mg L−1 and ammonia from 0.0 to 0.225 mg L−1.