Abstract
Laboratory microcosms are described for assessing the fate and effects of pollutants in marine and estuarine environments. These systems focus on specific ecosystem processes and interactions and are interdependant in that the results of all are necessary for a complete description of a pollutant's environmental impact. The following individual systems are described using methyl parathion as the pollutant: Environmental Fate Screening System; Eco‐Core System; Continuous Flow Systems; Aquatic Gradient Avoidance Response System; Benthic Bioassay System.