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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).
배연재,원두희,박선진,허준미,진영헌 한국육수학회 2000 생태와 환경 Vol.33 No.3
온도와 연관된 줄날도래(Hydropsyche kozhantschikovi)의 우화 양상을 연구하기 위하여 경기도 왕숙천에서 1999년 4월∼6월 동안 조사를 실시하였다. 우화하는 성충의 정량채집은 피라미드형 우화트랩을 이용하였다. 수온은 1999년에 1시간 간격으로 모니터링하였다. 우화는 일일 평균 수온이 약 10℃에 도달한 4월 15일에 시작되었고, 그 이후 빠르게 증가하여 약 10일만에 우화의 정점에 도달하였으며, 5월 25일까지 40일간 지속되었다. 우화된 성충의 평균개체수는 35.8inds./㎡였고, 암수의 성비는 수컷 : 암컷= 1 : 2.04였다. 수컷이 암컷보다 2일 정도 우화가 빨랐다. 일일 우화 양상은 일몰 직후(19:00∼21:00)에 제 1정점(66.7%)이 나타나고, 일출 직전 (05:00∼07:00)에 제 2정점(11.1%)이 나타나는 쌍생형 양상이었다. 본 연구의 적산온도 회귀모형에 따르면 우화의 시점, 정점, 그리고 완료에 도달하기 위한 누적적산 온도는 각각 453.89DD(수컷 440.48DD, 암컷 473.97DD), 615.71DD(수컷 610.18DD, 암컷 622.09DD), 그리고 820.24DD (수컷 828.25DD, 암컷 804.71DD)였다.