Spatial variations in the predation of nano-protozoa on bacteria in Lake Taihu, China
2018
Shao, Keqiang | Bai, Chengrong | Hu, Yang | Tang, Xiangming | Gao, Guang
We investigated the predation of nano-protozoa (size fraction < 16 μm) on bacteria in four regions of Lake Taihu, China using the dilution method. The results showed that the growth rate of bacteria in the Meiliang Bay, Gonghu Bay, Dapu River mouth, and Lake Center was 0.613 ± 0.024 d⁻¹, 1.015 ± 0.074 d⁻¹, 1.324 ± 0.052 d⁻¹, and 0.924 ± 0.034 d⁻¹, respectively. The predation rate of nano-protozoa on bacteria at these sites was 0.733 ± 0.061 d⁻¹, 1.245 ± 0.096 d⁻¹, 1.930 ± 0.039 d⁻¹, and 1.040 ± 0.025 d⁻¹, respectively. The growth rate at the Dapu River mouth was significantly higher than that at Lake Center and Meiliang Bay, and that at Gonghu Bay was significantly higher than that at Meiliang Bay. The predation rate was significantly higher at the Dapu river mouth than in the other three regions, and the predation rate at Gonghu Bay was significantly higher than in Meiliang Bay. Wind-induced waves, nutrient levels and algal blooms may explain these variations of the nano-protozoa predation rate in Lake Taihu. Our results also indicated that the mean predation rate in Lake Taihu was higher than those of other freshwater, or marine water environments.
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