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. 2018 Jul;203:474-481. doi: 10.1016/j.chemosphere.2018.04.008. Epub 2018 Apr 3.
Due to sea water eutrophication and global warming, the harmful Phaeocystis blooms outbreak frequently in coastal waters, which cause a serious threat to marine ecosystem. The application of rotifer to control the harmful alga is a promising way. To investigate the influence of initial rotifer density and temperature on the ability of rotifer Brachionus plicatilis to eliminate Phaeocystis globosa population, we cultured P. globosa with different initial rotifer densities (1, 3, 5 inds mL) at 19, 22, 25, 28, and 31 °C for 9-16 d. Results showed that the population of rotifer feeding on Phaeocystis increased rapidly and higher temperatures favored the growth of P. globosa and B. plicatilis. With increased initial rotifer density and temperature, both the clearance rate of rotifer and the reduction rate of P. globosa increased, and thus P. globosa were eliminated earlier. Both temperature and initial rotifer density had significant effects on clearance rate of rotifer and the time to Phaeocystis extinction, and there was a significant interaction between the two factors on the two parameters, i.e., the effect of initial rotifer density on eliminating Phaeocystis decreased with increasing temperature. The rotifer in 5 inds mL at 28 °C eliminated P. globosa in 4 d, whereas the rotifer in 1 ind mL at 19 °C spent about 16 d on eliminating P. globosa. In conclusion, higher temperature and bigger initial rotifer density promote rotifer to eliminate the harmful P. globosa, and the optimal temperature for rotifer to clear P. globosa is 28 °C.
由于海水富营养化和全球变暖，沿海海域有害的褐潮频繁爆发，对海洋生态系统造成严重威胁。轮虫应用于控制有害藻类是一种很有前途的方法。为了研究初始轮虫密度和温度对褶皱臂尾轮虫（Brachionus plicatilis）消除球形棕囊藻（Phaeocystis globosa）种群能力的影响，我们在 19、22、25、28 和 31°C 下，用不同初始轮虫密度（1、3、5 inds mL）培养球形棕囊藻 9-16d。结果表明，摄食棕囊藻的轮虫数量迅速增加，较高的温度有利于球形棕囊藻和褶皱臂尾轮虫的生长。随着初始轮虫密度和温度的增加，轮虫的清除率和球形棕囊藻的减少率均增加，从而更早地消除了球形棕囊藻。温度和初始轮虫密度对轮虫的清除率和棕囊藻灭绝时间均有显著影响，两者对这两个参数均有显著的交互作用，即初始轮虫密度对消除棕囊藻的影响随着温度的升高而降低。在 28°C 时，5 inds mL 的轮虫在 4d 内消除了球形棕囊藻，而在 19°C 时，1 inds mL 的轮虫则需要大约 16d 才能消除球形棕囊藻。总之，较高的温度和较大的初始轮虫密度促进轮虫消除有害的球形棕囊藻，轮虫清除球形棕囊藻的最佳温度为 28°C。
