?? ?? ??? ???? ? ???? ????? ???? (Habitat Classification and Distribution Characteristic of Aquatic Insect Functional Feeding Groups in the Geum River, Korea)

? ??? ?? ??? ????? ??? ??? ????? ?? ?? ???? ?????? ????? ???? ?? ??? 2007??? 2008??? ?? ???? ? 38? ??? ??? ?? ??? ?? ? 2?? ? 4? ??? ?????. 38? ?????? 15?? ?????? ?? ??? ? ??? ??? ??? ??? ??, ?? ??? 4? ???? ????(HD)? C1? C3??, ????(MS)? C2? C4 ??? C5??, ????(LR)? C6? C7???? ??? ??? ?????. ??? ????? ?? ??? ??? ??? ?????, ??? ????? ?? ??? ??, ??? ????? ?? ??? ????? ??? DO, ????? ?? ??? ?? ??? ???? ???? ?????. ???? ?? ??? ????? ? 9? 46? 142??? ?????, ??? ??? ?? ? ??? ??? ??? ?? ???? ?? ?? ????? ??? ??? ???? ????. ?? ?????? ???? ??? ??? ????, (1) ???? ??(FC)? ??, ??, ?? (2) ???? ??(GC)? ?? (3) ???? ??(P)? ??, ??, ??, ?????, ?? (4) ???? ??(PP)? ??, ?? (5) ???? ??(SC)? ??, ????? (6) ???? ??(SH)? ??, ??, DO, pH, ?????, ??? ?? ???? ??? ??? ????. ? ??? ??, ??? ??????(SMRA)? ?? ??? ?? ??? ???? ? ??, ??, ??, ?????, ?? ??? ?? ? 6?? ??? ????? ??? ???(r¨R0.600, P<0.01)? ?? ??? ??? ?? ?? ????? ??? ??? ??? ??? ???? ?????.

This study was performed to classify habitat types depending on environmental factors and to find out distribution characteristics of functional feeding groups of aquatic insects which were collected at that habitat types. Field survey was conducted twice in a year for every spring and fall from 2007 to 2008 for 38 sites in the Geum River. During the field survey 15 environmental factors were measured at each 38 sites and analyzed by similarity analysis method to classify habitat types. The result of similarity analysis showed that the 38 sites could be grouped into 7 classes like as C1 and C3 class belong to Head water(HD), C2 and C4 and C5 class belong to Middle stream(MS), C6 and C7 class belong to Large River(LR) based on euclidean distances 4. And also, we could extract the main environmental factors affecting the classification of habitat types such as Stream Width and Elevation of physical environmental factors, Water Temperature, Conductivity and DO of chemical environmental factors, percentages of Sand, Silt and Gravel of substrate factors. Total 142 species of aquatic insects in 46 families, 9 orders were collected during the field surveys and the occurrence number of species and individuals showed high correlation with the Velocity factor and the percentage of Sand factor of each habitat types. In addition, correlation analysis between functional feeding groups and environmental factors represented that (1) Filtering-collectors(FC) affected by Velocity, Stream Width and Silt, (2) Gathering- collector(GC) affected by Velocity, (3) Predator(P) affected by Elevation, Velocity, Boulder, Conductivity and Sand, (4) Plant-piecer(PP) affected by Water Width and Silt, (5) Scraper(SC) affected by Elevation and Conductivity, (6) Shredder(SH) affected by Elevation, Boulder, DO, pH, Conductivity and Water Temperature respectively. As a result of this study, Elevation, Stream Width, Velocity, Conductivity, Water Temperature and percentage of Sand factors which were deduced by stepwise multiple regression analysis had correlations(r¨R0.600, p<0.01) with biota community inhabitation. Therefore these six environmental factors were regarded as major environmental factors that might affect highly the distribution of functional feeding groups in stream ecosystem of the Geum River.