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Impacts of Impoundments by Low-head and Large Dams on Benthic Macroinvertebrate Communities in Korean Streams and Rivers  

Kil, Hye-Kyung (Seoul Metropolitan Government Research Institute of Public Health and Environment)
Kim, Dong-Gun (College of Life Sciences and Biotechnology, Korea University)
Jung, Sang-Woo (College of Life Sciences and Biotechnology, Korea University)
Jin, Young-Hun (Korean Entomological Institute, Korea University)
Hwang, Jeong-Mi (College of Life Sciences and Biotechnology, Korea University)
Bae, Kyung-Seok (Seoul Metropolitan Government Research Institute of Public Health and Environment)
Bae, Yeon-Jae (College of Life Sciences and Biotechnology, Korea University)
Publication Information
Korean Journal of Ecology and Environment / v.43, no.2, 2010 , pp. 190-198 More about this Journal
Abstract
This study was conducted to examine the effects of dams on benthic macroinvertebrate communities in Korean streams and rivers. Four low-head dams and three large dams were studied throughout South Korea. Sampling was taken at immediately upper (impoundment), lower (riffle area), and control (riffle area) sites from the dams during 2004-2007. The upper sites, of which substrate heterogeneity and velocity were relatively low, showed a lower degree of species richness, density, and diversity indices, which is very different from the lower and control sites. Heavily polluted streams showed a lesser degree of community differences between the upper and lower sites. In the large dams, the upper and lower sites showed very low values of species diversity indices and very high values of dominance indices compared to the control sites. In the low-head dams, however, the difference of degree of the values was relatively smaller. Compositions of the functional feeding groups and the habitat orientation groups were relatively simpler at the upper sites than at the lower sites and the degree of difference was greater in the large dams. Species richness and community indices of benthic macroinvertebrates were more significantly affected by habitat characteristics than water quality at the upper sites; however, those were more significantly related with water quality at the lower sites. In conclusion, large and low-head dams could simplify stream habitats particularly at the upper sites (impoundment), and they negatively affected on the benthic macroinvertebrate communities inhabited the habitats. The impact was larger in the large dams than in the low-head dams.
Keywords
benthic macroinvertebrates; low-head dams; large dams; functional groups; taxa composition;
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