【摘要】 为了探究不同温度和初始密度比对舟形藻和铜绿微囊藻生长竞争的影响,该研究设计不同温度梯度(10、15、20、25、30和35℃)和舟形藻与铜绿微囊藻不同初始密度比(1∶10、1∶1、10∶1),研究不同条件对2种微藻生长竞争的影响。结果表明:(1)单种培养条件下,随温度升高,舟形藻细胞密度呈现先增后减趋势,最适生长温度为20～25℃,最大藻细胞密度为3.883×10~5个/mL;铜绿微囊藻细胞密度随温度升高而增大,35℃达到最大值(4.813×10~6个/mL)。(2)混合培养条件下,温度和初始密度比对两者生长均产生影响,舟形藻对铜绿微囊藻的竞争能力随舟形藻初始密度增大而增强,温度25℃、初始密度比10∶1处理条件下,舟形藻对铜绿微囊藻生长抑制作用最为明显。(3)根据Lotka-Volterra竞争模型推断,高温(30～35℃)条件下,铜绿微囊藻占有优势;低温(10～20℃)条件、初始密度比为1∶10的舟形藻与铜绿微囊藻稳定共存;初始密度比为1∶1和10∶1时舟形藻占有优势,且在舟形藻最适生长条件(25℃)下两者不稳定共存。更多还原

【Abstract】 In this study we investigated the effects of different temperatures and initial density ratios of Navicula pelliculosa and Microcystis aeruginosa on their growth competition. Different temperature gradients(10, 15, 20, 25, 30 and 35 ℃) and different initial density ratios(1∶10, 1∶1, and 10∶1) were used. The results showed that:(1) in the xenic-culture systems, N.pelliculosa and M.aeruginosa reached the maximum growth rates at 20-25 ℃ and 35 ℃, respectively, with their maximum biomass being 3.883×10~5 and 4.813×10~6 cells/mL respectively.(2) In the co-culture systems, temperature and the initial density ratios both significantly influenced the competition between N.pelliculosa and M.aeruginosa. Higher initial density of N.pelliculosa resulted in greater advantage on their competitive capacity, and the growth inhibition effect of N.pelliculosa on M.aeruginosa was most obvious with the initial density ratio of 10∶1 when at 25 ℃.(3) According to the Lotka-Volterra model, it can be inferred that M.aeruginosa preponderated at high temperature(30-35 ℃). At low temperature(10-20 ℃), M.aeruginosa and N.pelliculosa coexist stably when their initial density ratio was 1∶10. N.pelliculosa dominated when the initial density ratio of N.pelliculosa to M.aeruginosa was 1∶1 or 10∶1.When N.pelliculosa was reached the temperature of 25 ℃ and the initial density ratio was 10∶1, M.aeruginosa and N.pelliculosa were unstably coexist in the co-culture system.更多还原