서울 당현천의 저서무척추동물상과 수생태 건강성 평가

The present study was performed to examine the aquatic ecosystem health assesment and community structure of Benthic Macroinvertebrates at Danghyun Stream in Seoul on April 29 to November 21, 2012. Total taxa of Benthic Macroinvertebrates were 63 species, 30 families, 13 orders and 6 classes in 4 phyla. All of them, non-insects were composed of 3 species in Annelida, 2 species in Mollusca, 1 species in Platyhelminthes and 1 species in Crustacea. Aquatic insects were composed of 17 species in Diptera, 16 species in Ephemeroptera, 14 species in Trichoptera, 3 species in Plecoptera, 3 species in Odonata, 1 species in Hemiptera, 1 species in Megaloptera and 1 species in Coleoptera respectively. Occurrence species was 43 species at upper site(site 1) and 15～21 species at restoreation water area(site 2～site 4). Major dominant species at site 1 was Semisulcospira liberta, simulium sp.1 and Glossoma KUa which are considered as clean water indicaters, dominant species at middle and lower area was Chironomidae sp. and Baetis fuscatus which are considered as somewhat pollution indicators. Species diversity index and species richness index were 3.54 and 3.29 at upper site, 2.26～2.53 and 1.60～1.81 at middle and lower area. Benthic Macroinvertebrates index was 90.2 at site 1, 44.1 at site 2, 53.1 at site 3 and 61.6 at site 4. Aquatic ecosystem health by Benthic Macroinverbrates index was very good level at site 1, good level at site 4, fair level at site 3 and poor level at site 2 respectively. Therefore, the results shows that site 1 is more stable Benthic Macroinvertebrate community structure than restoration water area at Danghyun Stream in Seoul.