Temperature-dependent elimination efficiency on Phaeocystis globosa by different initial population sizes of rotifer Brachionus plicatilis. (July 2018)

• Record Type: Journal Article
• Authors: Sun, Yunfei; Wang, Yuanyuan; Lei, Jin; Qian, Chenchen; Zhu, Xuexia; Akbar, Siddiq; Huang, Yuan; Yang, Zhou
• Is Part Of: Chemosphere. Volume 203(2018)
• Page Start: 474
• Page End: 481
• Publication Date: 2018-07
• Subjects: Biomanipulation -- Clearance rate -- Initial density -- Phaeocystis -- Rotifer -- Temperature; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2018.04.008
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: 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 −1 ) 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 −1 at 28 °C eliminated P. globosa in 4 d, whereas the rotifer in 1 ind mL −1 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. Highlights: The rotifer population increased rapidly when feeding on harmful Phaeocystis. The optimal temperature for rotifer to eliminate Phaeocystis is 28 °C. With increased rotifer density and temperature, Phaeocystis were eliminated earlier. Effect of rotifer density on clearing Phaeocystis decreased with rising temperature. Increased temperature improves consumer's ability to control autotrophic organism.