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낙동강 하류부에서 Stephanodiscus속에 의한 수화 발생시 미생물먹이망 군집 동태
서정관 ( Jung Kwan Seo ),이혜진 ( Hae Jin Lee ),정익교 ( Ik Kyo Chung ) 한국환경생물학회 2010 환경생물 : 환경생물학회지 Vol.28 No.3
The bloom of the genus Stephanodiscus was gradually extinguished after 18 April. Counts of bacterial population were increased as the diatom bloom was disappeared. Numbers of the heterotrophic nanoflagellates and ciliates were also increased during the disappearance of the bloom. The densities of the mesozooplankton, the major predator of the diatoms, started to increase in April. However, their growth was suppressed during the bloom period of the diatoms (from January to March). During the bloom period of the diatoms, the monthly average value of the basic productivity amounted up to 11,765.7 mgC m-2 day-1, which is relatively high value considering the low temperature and light during that period. The growth rate of phytoplankton in March, when the bloom was beginning to be supressed was 0.007. The growth rate of phytoplankton was negative value in April when the decreasing of the algal density was started.
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서정관,정익교 ( Jung Kwan Seo,Ik Kyo Chung ) 한국하천호수학회 1994 생태와 환경 Vol.27 No.3
The structure and seasonality of phytoplankton community were investigated in the region of the Naktong River Mouth in 1992-1993 period. The phytoplankton species composition in the main stream of the Nakdong River followed a large lowland and nutrient rich river`s pattern which was dominated by centric diatoms throughout the year and by green algae during the summer. Blue green algae were important in the West-Nakdong stream. The composition of dominant species at the station Dadaepo was quite similar to those found at the freshwater stations Kupo and Eulsukdo. This may be caused by the sampling strategy in which the tidal cycle was not considered and the artificial influence of the physical water mixing process of the opening of the gates on the algal flora. The chlorophyll-a content went beyond the hypertrophic level in the Nakdong River mouth. The values of diversity indices were very low and values of dominance indices were very high. The nutrient concentration in the Nakdong River mouth had shown severe fluctuations in the seasons of before and after barrage construction however, the nutrient concentration has kept high since the year of 1991. The high concentration of nutrient in the Nakdong River mouth may be caused by the waste discharge, stagnation of water, the decomposition of detritus, which was derived from the aquatic macrophytes, the introduction of agricultural fertilizer from surrounding rice field, nitrification and nutrient release from sediment. The characteristic phenomenon in the West-Nakdong stream was the blooming by blue green algae, Microcystis aeruginosa during the summer. Therefore, it is necessary to continuously monitor the phytoplankton community structure in this area throughout season.
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