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안태석,정미정,이은주,조규송 ( Tae Seok Ahn,Mi Jeong Jeong,Eun Joo Lee,Kyu Song Cho ) 한국하천호수학회 1995 생태와 환경 Vol.28 No.2
To scrutinize the biological effects of plankton communities to bacterial community, the total bacterial numbers, chlorophyll a concentration and phytoplankton, zooplankton communities were analyzed in Lake Soyang from May 13, to July 14, 1994. At Om depth, total bacterial numbers positively correlated with chlorophyll a concentration. On the other hand, at 2m depth, the two parameters had negative correlation. At the middle of the June, when dominants of phytoplankton, zooplankton were changing, the bacterial numbers dropped down. These results suggest that as the Anabaena becoming dominant species, the some zooplankton species changed to bacterivore. The bacterial community was mainly effected by phytoplankton at Om, and by zooplankton at 2m depth.
수생관속식물이 우점하는 호수에서 부유 세균과 부착세균 개체수의 계절적 변화
안태석,정미정 ( Tae Seok Ahn,Mi Jeong Jeong ) 한국하천호수학회 1996 생태와 환경 Vol.29 No.3
To find out the relationship between macrophyte and bacteria, the numbers of free-living bacteria and attached bacteria in two macrophytes dominant ponds were estimated weekly from May to August, 1995. The free-living bacterial numbers and attached bacterial numbers removed from macrophytes with stomacher were measured by the Acridine Orange Direct Count method. The free-living bacterial numbers were ranged 0.3x10^6∼2.3×1066 cells·ml^-1, and those were not correlated to chlorophyll a concentration. The maximum peak were appeared at flowering period. The attached bacterial numbers on N. tetragona, N. indica and A. calamus were ranged 2.4×10^6∼16.4×10^6 cells ·cm^-2, 10.6×10^6∼101.5x10^6cells ·cm^-2 and 2.3×10^6∼14.5x10^6cells ·cm^-2, respectively. The attached bacterial numbers of same pond were different from each host macrophyte. Just after the flowering period of each macrophyte, the attached bacterial number had maximum, which means that the bacterial community was affeced by the life cycle of macrophytes.
수생관속 식물이 우점하는 연못에서의 B - glucosidase 활성도 변화
안태석,정미정,최승익 ( Tae Seok Ahn,Mi Jeong Jeong,Seung Ik Choi ) 한국하천호수학회 1996 생태와 환경 Vol.29 No.4
For determing the ecological roles of free-living bacteria and epiphytic bacteria on marophytes (Acorus calamus, Nymphaea tetragona, Nymphoides indica), the β-glucosidase activities of free-living and attached bacteria were investigated at two ponds weekly from May, 1995 to August, 1995. The β-glucosidase activities of pond water of Yeonjeokji and Sesimjeong were ranged 35∼1073 nmol 1^-1 hr^-1 and 30∼898 nmol 1^-1 hr^-1, respectively. At Yeonjeokji, where the phytoplankton was abundance, the variations of β-glucosidase activity correlated with the chlorophyll a concentration, while at the Sesimjeong, where the macrophyte was abundance, the correlation between activity and chlorophyll a concentration was not appeared. The areal activity of A. calamus, N. tetragona, N. indica were varied 16∼437, 223∼149537 and 19∼2396 nM cm^-2 hr^-1, respectively. The lowest areal peaks of activities of three macrophytes were appeared during the flowering period. At Yeonjeokji, the specific activity of epiphytic bacteria on N. tetragona was higher than that of free-living bacteria during the late spring, but it was lower during the summer. In other hand, the specific activity of epiphytic bacteria on N. indica, was 200∼500 times higher than that of free-living bacteria. At Sesimjeong, variation of the specific activity of epiphytic bacteria on A. calamus was similar to that of free-living bacteria. These results suggest that bacterial mineralization rates are affected by the kind of macrophytes, their physicological state and limnological characteritics.
안태석,정미정,이은주,조규송 江原大學校 附設 環境硏究所 1996 環境硏究 Vol.13 No.-
To scrutinize the biological effects of plankton communities to bacterial community, the total bacterial numbers, chlorophyll a concentration and phytoplankton, zooplankton communities were analyzed in Lake Soyang from May 13, to July 14, 1994. At 0m depth, total bacterial numbers positively coi-related with chlorophyll o concentration. On the other hand, at 2m depth, the two parameters had negative correlation. At the middle of the June, whe dominants of phytoplankton, zooplankton were changing, the bacterial numbers dropped down. These results suggest that as the Anabaena becoming dominant species, the some zooplankton species changed to bacterivore. The bacterial community was mainly effected by phytoplankton at 0m, and by zooplankton at 2m depth.