论文部分内容阅读
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 p H) on the allelopathic eff ects 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 30°C), salinity(10, 20, 30, and 40), light(20, 100, 200 and 400 μmol/(m~2 ?s)), and p H(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-p H, salinity-light, salinity-p H, and light-p H). Results showed that the allelopathic eff ect was significantly influenced by temperature, salinity, light, and p H. As single factors, the low temperature(15°C), low salinity(10), high-intensity light(400 μmol/(m~2 ?s)), and high p H(10) treatments substantially enhanced the allelopathic eff ect. The strongest allelopathic eff ect of C. pilulifera on H. akashiwo was observed under the following treatments: 15°C and salinity of 40, 25°C and p H 10, 25°C with medium- to high-intensity light at 200–400 μmol/(m~2 ?s), 400 μmol/(m~2 ?s) and salinity of 10, 400 μmol/(m~2 ?s) and p H 10, and p H 10 with a salinity of 40.
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 p H) on the allelopathic eff ects 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 30 ° C), salinity (10, 20, 30 and 40), light (20, 100 and 200 and 400 μmol / , 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 eff ect was significantly influenced by temperature, salinity, light, and p H. As single factors, the low temperature (15 ° C), low salinity (10), high-intensity light (400 μmol / (m ~ 2μs)), and high p H (10) the allelopathic eff ect. The strongest allelopathic eff ect of C. pilulifera on H. akashiwo was observed under the following treatments: 15 ° C and salinity of 40, 25 ° C and p H 10, 25 ° C with medium- to high- intensity light at 200-400 μmol / m 2 s, 400 μmol / m 2 s and salinity of 10 400 μmol / m 2 s and p H 10, and p H 10 with a salinity of 40.