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보문 : 인공수로에서 고농도 탁수가 수질 및 부착 규조류 군집에 미치는 영향
윤성애 ( Sung Ae Yoon ),유경아 ( Kyung A You ),박지형 ( Ji Hyoung Park ),김백호 ( Baik Ho Kim ),황순진 ( Soon Jin Hwang ) 한국하천호수학회(구 한국육수학회) 2011 생태와 환경 Vol.44 No.1
We examined the effect of the turbid water on the periphytic diatom community in an artificial stream system. The artificial stream was constructed with transparent acryl and composed of four channels. Each channel (20cm×200cm×40 cm) was supplied continuously with eutrophic lake water. In order to the freely colonize and grow diatoms, artificial substrate was installed with commercial slide glass soaked in 1% agar. Prior to introducing turbid water, the artificial stream was operated with lake water for 6 days to permit the propagation of diatom community on the substrates. The turbid water prepared with sediment sieved with Φ 64μm at 2g L-1 (final concentration, 300 NTU) was provided daily for 50 minute duration. The experiment was conducted for 7 days with manipulated experimental condition of light (50~80μmol m-2 s-1, light : dark=24: 0), temperature (10±1℃), and flow rate (0.31cm s-1). Sampling and analysis were conducted daily for water quality and diatom. Turbidity of the water varied 162.2~173.2 NTU during the experiment. After introduction of turbid water, DO, pH and TN were decreased, while SS and TP increased significantly. A total of 14 genera and 47 species of diatoms was observed on the artificial substrates during the experimental period. Of these, Navicula appeared to be a most dominant genus with 10 species, followed by Cymbella (6 species), Fragilaria (6 species) and Gomphonema (5 species). Achnanthes minutissima was the most dominant species (>70% of total frequency) in both control and treatment experiments. Increase in diatom abundance lasted for three days since turbid water introduction, after that they gradually decreased by the termination of the experiment. These results suggest that frequent supply of highly-concentrated turbid water significantly decreases the periphytic diatom community, and retard the recovery of the stable food-web within the stream.
강필구 ( Phil Goo Kang ),이송지 ( Song Ji Lee ),변명섭 ( Myeong Seop Byeon ),윤성애 ( Sung Ae Yoon ),김헌년 ( Hun Nyun Kim ),이재관 ( Jae Kwan Lee ),황순진 ( Soon Jin Hwang ) 한국하천호수학회(구 한국육수학회) 2014 생태와 환경 Vol.47 No.1
Some blue-green algal species such as those in the genus Anabaena causing severe algal blooms can produce akinetes, resting spores, in aquatic ecosystems. Germinated akinetes staying in the sediment as “seed banks” grow into vegetative cells under favorable conditions of light intensity, nutrient, and temperature. Therefore, akinete plays an important role in forming the nuisance bloom. However, little information is available in the ecological study of akinetes compared to that of vegetative cells in Korea. This review reports ecological and physiological characteristics of akinetes, especially of the blue-green algal genus Anabaena. We also suggest the feasible area of akinetes in the freshwater ecosystems. We expect that the suggested studies associated with akinetes will contribute to further understanding the life cycle and ecology of Anabaena and other algae.