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cje ›› 2010, Vol. 29 ›› Issue (03): 454-459.

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Effects of temperature on interspecific competition between two bluegreen algae.

CHEN Jia-zhang;MENG Shun-long;HU Geng-dong;QU Jian-hong;WU Wei;FAN Li-min;MA Xiao-yan;QIU Li-ping   

  1. Key Open Laboratory of Ecological Environment and Resources of Inland Fisheries,Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences,Fishery EcoEnvironment Monitoring Center of Lower Reaches of Yangtze River, Ministry of Agriculture, Wuxi 214081, Jiangsu, China
  • Online:2010-03-10 Published:2010-03-10

Abstract: A laboratory experiment was conducted to study the interspecific competition between Microcystis aeruginosa and Oscillatoria princeps at 20 ℃, 25 ℃,and 30 ℃. Both in pure culture and in mixed culture, M. aeruginosa grew best at 25 ℃, while O. princeps grew best at 30 ℃. Temperature had obvious effects on the inhibition parameter of interspecific competition between the two algae. The inhibition parameter of O. princeps against M. aeruginosa at 30 ℃ was 1.42 and 1.13 times as that at 20 ℃ and 25 ℃, while the inhibition parameter of M. aeruginosa against O. princeps was the maximum at 25 ℃, being 1.54 and 1.21 times as that at 20 ℃ and 30 ℃, respectively. At 20 ℃, 25 ℃, and 30 ℃, the inhibition parameter of M. aeruginosa against O. princeps was all larger than that of O. princeps against M. aeruginosa, which meant the stronger inhibition effects of M. aeruginosa on O. princeps at the test temperatures. Based on the competition model of LotkaVolterra, M. aeruginosa won the competition at 20 ℃ and 25 ℃, and M. aeruginosa and O. princeps could unstably coexist at 30 ℃.

Key words: Livestock production, Sustainable development, Assessment