科研之友
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摘要
Over the past few years, harmful algal blooms (HABs), such as red tides, have been frequently observed in coastal zones worldwide. The natural allelopathic interactions among macroalgae and red tide microalgae can alter the structure and succession of aquatic ecosystems. We investigated the influence of four environmental factors (temperature, salinity, light, and pH) on the allelopathic effects of the macroalgae Corallina pilulifera on red-tide forming Heterosigma akashiwo under laboratory conditions. Each of the factors had four levels: temperature (15, 20, 25, and 30A degrees C), salinity (10, 20, 30, and 40), light (20, 100, 200 and 400 mu mol/(m(2)a (TM) s)), and pH (5.5, 7, 8.5, and 10. Two-factor experiments were designed for each two environmental factors, with six combination treatments (temperature-salinity, temperature-light, temperature-pH, salinity-light, salinity-pH, and light-pH). Results showed that the allelopathic effect was significantly influenced by temperature, salinity, light, and pH. As single factors, the low temperature (15A degrees C), low salinity (10), high-intensity light (400 mu mol/(m(2)a (TM) s)), and high pH (10) treatments substantially enhanced the allelopathic effect. The strongest allelopathic effect of C. pilulifera on H. akashiwo was observed under the following treatments: 15A degrees C and salinity of 40, 25A degrees C and pH 10, 25A degrees C with medium- to high-intensity light at 200-400 mu mol/(m 2 a (TM) s), 400 mu mol/(m(2)a (TM) s) and salinity of 10, 400 mu mol/(m(2)a (TM) s) and pH 10, and pH 10 with a salinity of 40.
