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경기도 가평천의 하순에 따른 수서곤충 군집조성과 섭식기능군
배연재 ( Yeon Jae Bae ),원두희 ( Doo Hee Won ),황득휘 ( Duc Huy Hoang ),진영헌 ( Young Hun Jin ),황정미 ( Jeong Mi Hwang ) 한국하천호수학회 2003 생태와 환경 Vol.36 No.1
Community composition and functional feeding groups of aquatic insects according to stream order were investigated from the Gapyeong Creek, a typical mid-sized Korean stream in Gyeonggi-do, Korea, in April 2000. For field investigations, the main watercourse and three major tributaries of the stream that belong to stream order Ⅱ to Ⅶ were divided into reaches (ca. 1~4 km in distance). Aquatic insects were sampled from one or two sites each reach (total 30 sites) using a Surber sampler(50×50cm, mesh 0.75mm). As a result of the quantitative samplings (two Surber samplings at riffle and pool/run per site; total 2×30=60 Surber samplings) and additional qualitative samplings, a total of 164 species of aquatic insects in 103 genera, 54 families, and 8 orders were collected from the stream. Those aquatic insects were composed of Trichoptera (56 spp.: 34.1%), Ephemeroptera (43 spp.: 26.2%), Diptera (25 spp.: 15.2%), Plecoptera (23 spp.: 14.0%), Coleoptera (6 spp.: 3.7%), Odonata (6 spp.: 74.4%) or EPT-group plus Diptera 9147 spp.: 89.6%) occupied most of the aquatic insect community; relatively larger number of species occurred in the mid-stream reaches (order Ⅲ-Ⅵ). The quantitative samplings throughout the study sites yielded a total of 26,286 individuals of aquatic insects (136~2522 inds./0.5㎡, mean 906.4 inds./0.5㎡) that belongs to Ephemeroptera (11,994 inds.: 45.6%), Diptera (8730 inds.: 33.2%), Trichoptera (4123 inds. : 15.7%), Plecoptera (1213 inds.: 4.6%), Coleoptera (204 inds.: 0.8%), Odonata (13 inds.: 0.05%), Megaloptera (5 inds.: 0.02%), and Hemiptera (4 inds.: 0.02); average number of individuals of aquatic insects increased as the stream order increased; average numbers of individuals of Plecoptera and Trichoptera decreased and increased, respectively, as the stream order increased. Tolerant species such as Chironomidae spp., Uracanthella rufa, and Hydropsychidae spp. were particularly abundant in the down stream reaches (order Ⅶ). Species diversity indices (H`) and dominance indices (DI) were relatively higher and lower, respectively, in the mid-stream reaches (order Ⅳ~ Ⅵ). Shredders occupied the smallest part and collector-gatherers were most abundant among the functional feeding groups(FFGs); collector-filterers considerably increased in the down stream reaches (orders Ⅵ and Ⅶ); scrappers were relatively evenly distributed throughout the stream reaches; predators were relatively more abundant in the uppermost stream reaches (order Ⅱ).