Biotic assemblages in aquatic ecosystems are excellent integrators and indicators of changing environmental conditions within a watershed. Therefore, temporal changes in abiotic environmental variables often can be inferred from temporal changes in biotic
Miller, Matthew P. mamiller@usgs.gov,Brasher, Anne M.D.,Keenen, Jonathan G.. Multi-regional synthesis of temporal trends in biotic assemblages in streams and rivers of the continental United States. 2013-01-01.