INFLUEN OF HYDROPEAKING ON THE DISTRIBUTION AND LARVAL DEVELOPMENT OF THE PLECOPTERA FROM A MOUNTAIN STREAM

摘要

The downstream distribution and larval development of the Plecoptera from a Pyrenean stream were studied upstream and downstream of a hydroelectric power plant with intermittent hypolimnetic releases. During power generation, flow and temperature were the two main environmental factors modified. The downstream distribution of the various taxa reflected both the impact of hydropeaking and the natural zonation. The lowest densities and biomasses were estimated at 700 m downstream from the plant, underlining the prominent role of hydropeaking.