황강의 저서성 대형무척추동물의 군집구조에 관한 연구 = The Study on the community Structure of the Benthic Macroinvertebrates in Whanag River

다국어 초록 (Multilingual Abstract)

The present study was conducted to determine the community structure in Whang river based on the benthic macroinvertebrates. The survey area included eight sites in Whang river and two sites in Nakdong river and the study was carried out from March of 1995 to February of 1996.
The result are as follows;
(1) Benthic mactoinvertebrates are composed of a total of 200 species including 114 genera, 71 families, 21 orders, 7 classes in five phyla. A total of 200 species was found in Whang river, however only 66 species were recorded in Nakdong river.
2) Species frequency was different depending on the study area. It ranged from 84-112 species in the upper stream(site 1 to 6) to 71-75 species in the lower stream(site 7 to 8) and 41-58 species in the Nakdong river(site 9 to 10). Taxa with highest species frequency were aquatic insecta.
3) Average number of individuals was 1656.5/0.5㎡ in the whole study aera. Inividual number was variable from 53/0.5㎡ at the site 8 to 296.8/0.5㎡ at the site 4. Taxa with highest individual species frequency were aquatic insecta.
4) Trichoptera and Ephemeroptera were dominant in upper stream, while Chironomidae was the most aboundant group in the lower stream.
5) Average dominance(DI), species richness(RI), species diversity(H'), and evenness(J') were 0.68, 2.71, 3.10 and 0.71, respectively, in the whole study area. The biotic indices in Whang river were relative higher than that of Nakdong river.
6) Functional feeding groups were collectors and shredder at site 1 to 6, filterer at site 7 to 10.