Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China.
Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China.
Chemosphere. 2017 Apr;172:96-102. doi: 10.1016/j.chemosphere.2016.12.146. Epub 2016 Dec 30.
This study aimed to investigate the influence of temperature on the ability of the mixotrophic flagellate Ochromonas to eliminate a toxic Microcystis population and degrade microcystins. We exposed Microcystis to cultures with or without Ochromonas YZ1 at 20, 25, and 30 °C for 10 days. Results showed that increased temperature promoted the growth of Ochromonas YZ1 and Microcystis, with the latter achieving high abundance without grazing. With increased temperature, Ochromonas YZ1 clearance rate increased, and Microcystis populations were earlier eliminated. Importantly, Ochromonas YZ1 degraded both intracellular and extracellular microcystins by grazing effects. The reduction ratios of Microcystis abundances and microcystins were both approximately 100% after 6 days at high temperature. In addition, more microcystins were released outside at 20 °C than at the higher temperatures. Overall, this study showed that high temperature favors elimination of toxin-producing Microcystis and degradation of microcystins by mixotrophic Ochromonas.
本研究旨在探究温度对混养鞭毛藻 Ochromonas 消除有毒微囊藻种群和降解微囊藻毒素能力的影响。我们将微囊藻暴露于有或没有 Ochromonas YZ1 的培养物中，在 20、25 和 30°C 下培养 10 天。结果表明，温度升高促进了 Ochromonas YZ1 和微囊藻的生长，后者在没有摄食的情况下达到了高丰度。随着温度的升高，Ochromonas YZ1 的清除率增加，微囊藻种群更早被消除。重要的是，Ochromonas YZ1 通过摄食作用降解了细胞内和细胞外的微囊藻毒素。在高温下 6 天后，微囊藻丰度和微囊藻毒素的减少率均约为 100%。此外，在 20°C 时，比在较高温度下释放出更多的微囊藻毒素。总的来说，本研究表明，高温有利于消除产毒微囊藻和混养的 Ochromonas 对微囊藻毒素的降解。
