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http://dx.doi.org/10.17663/JWR.2017.19.2.252

Effects of small dam in a stream on benthic macro-invertebrate community  

Park, Hyekyung (Department of Biology Education, Seoul National University)
Lee, Seong Jae (Department of Biology Education, Seoul National University)
Cheong, SooA (Department of Biology Education, Seoul National University)
Jeong, Hyeong Rae (Department of Biology Education, Seoul National University)
Kim, Jae Geun (Center for Education Research, Seoul National University)
Publication Information
Journal of Wetlands Research / v.19, no.2, 2017 , pp. 252-258 More about this Journal
Abstract
To determine the effects of small dam on benthic macro-invertebrate community, benthic macro-invertebrates were surveyed with both quantitative and qualitative collecting methods from 4 sites at a terraced interval (3.02 small dams per 100 m) and from 5 sites at a non-terraced interval (0.96 small dams per 100 m) in upper reach of Dorim stream, Seoul. The average water flow rate was higher at the non-terraced interval (0.149 m/s) than at the terraced interval (0.043 m/s). Diptera, which prefer slow water flow or lentic habitats, appeared more abundantly in the terraced interval (78.3%) than in the non-terraced interval (32.0%)(p<.05). Ephemeroptera, which prefer fast water flow or lotic habitats, appeared more abundantly in the non-terraced interval (14.1%) than in the terraced interval (4.5%)(p=.203). There was a difference in species distribution of Trichoptera in terraced and non-terraced intervals depending on preferred environment. In the terraced interval, the occupancy ratio of gathering-collector was 1.8 times higher than in the non-terraced interval (p<.05). In contrast, filtering-collector appeared to be about 4.4 times higher rate in the terraced interval (p=.124). The evenness indexes (J′) were found to be 0.41 and 0.77, respectively in terraced area and non-terraced intervals. KSI, evaluating biological water quality, showed an average of 4.0 and 2.4 respectively in terraced and non-terraced intervals. EPT/C index, indicating the balance of the community, showed an average of 0.1 and 0.7 respectively in terraced and non-terraced intervals. It suggests that we should make small dams in order to maintain biodiversity of benthic macro-invertebrates.
Keywords
terraced area; functional feeding groups; the evenness indexes (J′); KSI; EPT/C;
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Times Cited By KSCI : 7  (Citation Analysis)
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