Benthic macroinvertebrates were collected using the Surber sampler from streams in forest areas in Southern Korea in spring and summer. Self-Organizing Map (SOM) was utilized to reveal community patterns in response to natural and anthropogenic variability in different seasons. The gradient was mainly observed according to degree of pollution and altitude. Subsequently, community compositions reflected seasonality in less-polluted area, showing difference in functional feeding groups. Gatherer-collectors and filterer-collectors were abundantly collected in spring whereas scrapers and predators were sampled in a majority in late summer. Representative species groups were identified in different seasons. persistence in communities in response to natural and anthropogenic variability.

• Tae-Soo Chon(Department of Biological Sciences, Pusan National University)
• Dong-Hwan Kim(Department of Biological Sciences, Pusan National University)
• Hyun Duk Cho(Department of Biology, Kyung Hee University)
• Woon-Seok Cho(Department of Biological Sciences, Pusan National University)
• Young-Seuk Park(Department of Biology, Kyung Hee University)