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최승익,변명섭,안태석 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-
The total bacterial numbers were estimated by acridine orange direct count method in Lake Soyang monthly from January 1990 to 1992 The range of total bacterial number was from 0.4*10^(6) to 4.7*10^(6) cell*㎖^(-1). In epilimnion,the variation range was wider than other depths. while in hypolimnion was narrower. At August, when water temperature was highest. the bacterial numbers was also highest . This means that water temperature was highest the bacterial numbers was also highest. This means that water temperature was one of the factor governing the bacterial abundance. In metalimnion. the bacterial number was higher than other depths during stratigication. And spacially the bacterial numbers near aquaclture net-cages were higher than those of dam site. This means that allochthonous materials such as terrestorial originated particle, organics and microbes from watershed and fish feed stinmulated the bacterial growth.
16S와 23S rRNA에 결합하는 probe를 이용한 겨울철 소양호 세균 군집 구조의 분석
홍선희,변명섭,안태석 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-
겨울철 소양호에서 세균 군집 구조를 파악하고자 총세균수와 EUB338, ALF1b, BET4a, GAM42a와 CF probe등 fluorescent rRNA targeted oligonucleotide probe와 반응하는 세균 개체수를 수심별로 측정하였다. 총세균수는 0.7×10^(6)~1.1×10^(6)cell·㎖^(-1)이였으며, 5m와 10m 수층에서 높게 나타났다. 총세균수에 대한, Eubacteria의 비율은 34~90%이였으며, 5m와 10m에서 낮게 나타났다. Proteobacteria α-group은 Eubacteria의 10.8-28.7%, β-group은 4.5-53.5%, γ-group은 4.9-35.5%, 그리고 Cytophaga-Flavobacterium group은 6.1-21.1%이였다. 0.5m 수심에서는 β-group이 28.6-53.3%로 우점하고 있었으며, 10m에서는 γ-group이 35.5%로 우점하였다. 30, 50m 수심에서는 α-group과 Cytophaga-Flavobacterium group이 우점하였다. 세균 군집 구조로 보면 0-2m, 5-10m 그리고 30-50 m의 3개층은 각각 독특한 특징을 나타내었다. 이 방법으로 호수 생태계에 대한 새로운 정보를 얻을 수 있었다. To scrutinize the bacterial community composition of Lake Soyang in winter, bacterial numbers blonging to Eubacteria, Proteobacteria and Cytophaga-Flavobacterium group were estimated by using 16S and 23S rRNA targeted oligonucleotide probes. Total bacterial numbers ranged from 0.7Χ10^(6)~1.1Χ10^(6)cell ·㎖^(-1)and vertical profile of total bacteria showed a peak at 5m and 10m depths those were low exhibiting, 39 and 34%, respectively, The percentage of proteobacteria α-group ranged 10.8~28.7%, β-group 4.5~535%, Υ-group 4.9~35.5% and Cytophaga-Flavobacterum group 6.1~21.1%. The dominant groups were β-group at 0, 2 and 5m Υ-group at 10m, α-group at 30m and Cytophaga-Flavobacterium group at 50m depth. In winter season, Lake Soyang can be divided into into three layer, 0~2m, 5~20m and 30~50m, by bacteria community composition. By this method, new informations about aquatic ecostem were developed.
안태석,최승익,변명섭,박호완 江原大學校 附設 環境硏究所 1998 環境硏究 Vol.15 No.-
To define the ecological roles of bacteria in Lake Soynng, the depth profiles of bacterial numbers and their biovolume were estimated temporally. In August, 1992, the bacterial numbers and biovolume were ranged from 12×10^(5) to 28×10^(5) cells ml^(-1) and from 0.4 to 1.0 ㎛³ cell^(-1), respectively. At 30m depth, the biovolume was highest as 1.0㎛³ cell^(-1) while the numbers were not changed. These large bacteria might be allochthonous bacteria originated from terrestrial during the heavy rain. In October, 1882, the bacterial numbers were ranged from 6×10^(5) to 17×10^(5) cells ml³ , and biovolumes at epilimnion were about 0.5 ㎛³ cell^(-1), while at metalimnion and hypolimnion, larger than 0.9 ㎛³ cell^(-1). In this time, zooplankton grazing pressure and nutrients release from sediment might affect the bacterial numbers and biovolume. In April, 1993, when Asterionella and Fragifaria were dominant species of phytoplankton only in epilimnion, the bacterial numbers were about 20×10^(5) cells ml^(-1), and biovolumes were about 0.8㎛³ cell^(-1). While at other depths, the numbers and biovolumes were smaller. These results suggest that the bacterial numbers were dynamically changed with season, while their mean cell volume were commonly stable as 0.5㎛³ cell^(-1). But by the allochthonous bacteria, organic materials released by phytoplnnkton and grazing pressure by zooplankton might increase the biovolume.
Bacterial Abundances and Enzymatic Activities under Artificial Vegetation Island in Lake Paldang
( Myeong Seop Byeon ),( Jae Jun Yoo ),( Ok Sun Kim ),( Seung Ik Choi ),( Tae Seok Ahn ) 한국하천호수학회 2002 생태와 환경 Vol.35 No.4
팔당호에 설치된 인공식물섬에서 미생물의 역할을 알아보기 위하여 동물플랑크톤 군집 크기, 총세균수, 활성세균수, β-glucosidase와 phosphatase의 체외효소활성도를 2001년 11월 3일부터 2002년 4월까지 격주로 인공식물섬이 설치된 지역과 바깥지역을 대상으로 조사 분석하였다. 인공식물섬 아래에서는 일반적으로 측정하는 환경요인들은 대조구보다 수질이 나쁜 것으로 나타났다. 그러나, 동물 플랑크톤의 수는 대조구보다 평균 25배, 활성세균의 수는 평균 3-8배, 그리고 체외효소활성도는 훨씬 높은 값을 보였다. 이러한 결과는 인공식물섬에서는 동물플랑크톤-식물플랑크톤-수초-세균의 밀접한 관계가 존재하고, 이 관계에 의하여 동물플랑크톤과 세균의 호흡, 분해작용으로 유기물이 제거되는 것으로 판단되었다. For analyzing function of a microbial ecosystem which was created under the artificial vegetation island(AVI) installed at Lake Paldang, zooplankton and bacteria numbers and exoenzyme activities(β-glucosidase and phosphatase) were measured biweekly from 3 November 2001 to 20 April 2002 at AVI site and control site. Under the AVI, the water quality was worse than control site in term of comparing the environmental parameters. Respiratory active bacterial numbers were 3-8 time higher at AVI site. These results suggest that the zooplankton-phytoplankton-bacteria relationships are closely coupled with each other and organic materials are eliminated by respiration of zooplankton and bacterial activities.