TY - JOUR AU - Alonso González, Carlos AU - García de Jalón, Diego AU - Marchamalo, Miguel PY - 2011 SN - 1699-3063 UR - http://hdl.handle.net/10481/21687 AB - Fish communities are a key element in fluvial ecosystems Their position in the top of the food chain and their sensitivity to a whole range of impacts make them a clear objective for ecosystem conservation and a sound indicator of biological... LA - eng KW - Fishes KW - WFD KW - Biological integrity KW - Reference conditions KW - Spain TI - Fish communities as indicators of biological conditions of rivers: methods for reference conditions ER -