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Characterization of Benthic Macro-Invertebrate Communities and Hydraulic Factors in Small- Scale Habitats in a Polluted Stream  

Kwak, Inn-Sil (Division of Biological Sciences, Pusan National University)
Liu, Guangchun (Dept. of Agriculture, Shenyong Univ. P.R. China)
Park, Young-Seuk (CESA UMR, CNRS-University Paul Sabatier, France)
Song, Mi-Young (Division of Biological Sciences, Pusan National University)
Chon, Tae-Soo (Division of Biological Sciences, Pusan National University)
Publication Information
Korean Journal of Ecology and Environment / v.35, no.4, 2002 , pp. 295-305 More about this Journal
Abstract
Benthic macro- invertebrates were collected in a 200 m reach located in the $3^{rd}$ order Yangjae Stream, a tributary of the Han River, Seoul, from April 1996 to March 1998. Although species richness was relatively low due to organic pollution, community abundance patterns appeared to be different depending upon location of the sampling sites. At the sample sites in the straight zone with high water velocity and large substrates, species richness was high and species relatively less-tolerant to organic pollution was additionally present. At the sample sites in the pool zone with lower velocity and high sedimentation, species richness was low and a few tolerant species to organic pollution were abundantly collected. The principle component analysis indicated that some sample sites in the straight zone appeared to be related to water velocity and shear velocity, and associated with diverse taxa less tolerant to organic pollution. Additionally the sample site transplanted with large substrates was associated wit]h hydraulic characters such as substrate diversity and roughness, and was related to species indicating partial recovery of water. The sample sites located at the pool zone tended to be associated with organic matter that had sedimented on to the substrates and the taxa tolerant to organic pollution, including Oligochaeta and Chironomus.
Keywords
Community structure; benthic macro-invertebrates; stream; habitats; multivariate analysis;
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