Abundance and production of bacteria and their correlations with environmental factor
JI Feng-yun1,2, GUO Li-mei1,2, LI Hong-bo2, MING Hong-xia2, SU Jie2, ZAN Shuai-jun3, GUAN Chun-jiang2, MA Yue-xin1, WANG Jian-ning4, ZHAO Wen1, FAN Jing-feng2
1. Dalian Ocean University, Institute of Aquaculture and Life, Dalian 116023, China;
2. National Marine Environmental Monitoring Center, Dalian 116023, China;
3. Dalian University of Technology, School of Environmental Science & Technology, Dalian 116023, China;
4. Xiamen University, Institute of Marine Microbes and Ecospheres(IME), Xiamen 361005, China
Abstract：Distribution of abundance and production of bacteria and their correlations with environmental factor were investigated, using plate count method and flow cytometry, in the surface and vertical waters of the northern south China sea in August 2014. The cultivable bacterial abundance ranged from 3.70×102 CFU/mL to 1.42×103 CFU/mL, the total bacterial abundance ranged from 5.12×105 cells/mL to 1.61×106 cells/mL and the bacterial productions varied from 0.03 mg/m3/h to 0.40 mg/m3/h in horizontal distribution. In vertical distribution, the cultivable bacterial abundance ranged from 1.08×103 CFU/mL to 9.00×103 CFU/mL and the bacterial productions varied from 0.01 mg/m3/h to 0.08 mg/m3/h, respectively. The correlation analysis results showed that the environmental factors affecting the abundance of total bacteria and bacterial productivity included temperature, salinity, nitrate (NO3-N), silicate (SiO3-Si), nitrite (NO2-N), and phosphate (PO4-P) (P<0.05). NO2-N was the main influencing factor to cultivable bacteria abundance (P<0.05), while bacterial productivity was highly correlated with temperature and salinity in vertical distribution of northern south China sea (P<0.05). The total bacterial abundance was 2~3 orders of magnitude higher than cultivable bacteria, suggesting that there were many uncultured bacterium in surface water of northern south China sea and bacterial activities in the surface maybe more active than in the bottom.
JI Feng-yun,GUO Li-mei,LI Hong-bo et al. Abundance and production of bacteria and their correlations with environmental factor[J]. Marine Environmental Science, 2017, 36(3): 354-359.
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