Benthic macroinvertebrates are considered as a representative group in presenting ecological states and water quality in freshwater ecosystems. Although much study has been not conducted in stream, relatively few cases were comparatively reported in community responses to disturbances in lake and stream. Benthic macroinvertebrate were sampled in 12 lakes and 8 streams in different trophic and saprobic state. The sampled communities were accordingly grouped according to degree of disturbance. Species abundance distribution (SAD) was used for illustrating ecological states, and the fitness was accordingly checked with the proposed models. SADs were divided according to saprobic states in stream while SADs were clearly separated based on trophic levels

• Dong-Hwan Kim(Department of Biological Sciences, Pusan National University)
• Woon-Seok Cho(Department of Biological Sciences, Pusan National University)
• Tae-Soo Chon(Department of Biological Sciences, Pusan National University)