Effects of nitrite on the growth and competition of Microcystis aeruginosa and Scendesmus quadricauda
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Abstract:
Not only population densities of phytoplankton but also its community structure can be influenced by nitrite concentration.To investigate this effect,the growth and competition of Microcystis aeruginosa and Scendesmus quadricauda under different nitrite concentrations are studied by using batch cultures,and the competition relation is analyzed by the competition parameters.The results indicate that there is competition between M.aeruginosa and S.quadricauda in present experiment conditions,and S.quadricauda is dominant in competition.Meanwhile,the increase of nitrite concentration can strengthen S.quadricauda dominance,because under high nitrite concentration (20 mg/L,30 mg/L),M.aeruginosa is more damaged and the allelopathy between M.aeruginosa and S.quadricauda is intenser.
