경기만에서 박테리아와 종속영양편모류의 계절변화에 미치는 환경요인 분석

서지정보

ㆍ발행기관 : 한국환경생물학회 ㆍ수록지정보 : 환경생물 / 35권 / 2호
ㆍ저자명 : 백승호, 유카이, 한명수

영어 초록

From June 2007 to May 2008, seasonal variations of bacterial abundance and heterotrophic nanoflagellate (HNF), together with environmental factors, were investigated at weekly and monthly intervals in Kyeonggi Bay. During the study period, the water temperature and salinity varied from 1.929.0 and 3135.1 psu, respectively. The concentration of ammonia, nitrate+nitrite, phosphate, and silicate ranged from 0.01 to 3.22 M, 2.03 to 15.34 M, 0.06 to 1.82 M, and 0.03 to 18.3 M, respectively. The annual average concentration of Chl. a varied from 0.86 g L-1 to 37.70 g L-1; the concentration was twice as much at the surface than at the deeper layers. The abundance of bacteria and HNF ranged from 0.29106 to 7.62106 cells mL-1 and 1.00102 to 1.26103 cells mL-1, respectively. In particular, there were significant correlations between bacteria and HNF abundance (p0.05), and then the high abundance of HNF was frequently observed with an increase of bacterial abundance in summer (p0.001). Our results therefore indicate that bacterial abundance in the bay was mainly controlled by resources supplied as organic and inorganic substances from Lake Shihwa due to the daily water exchange after dike construction. Also, the bacterial abundance was significantly controlled by HNF grazing pressure (top-down) in the warm seasons, i.e. excluding winter, in the Kyeonggi Bay.

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