Toxic microcystis reduces tolerance of daphnia to increased chloride, and low chloride alleviates the harm of toxic microcystis to daphnia. (December 2020)

• Record Type: Journal Article
• Authors: Li, Yurou; Zhu, Yuying; Ma, Lili; Huang, Jing; Sun, Yunfei; Zhang, Lu; Lyu, Kai; Yang, Zhou
• Is Part Of: Chemosphere. Volume 260(2020)
• Publication Date: 2020-12
• Subjects: Chloride -- Daphnia magna -- Life-history traits -- Microcystis aeruginosa -- Reproductive performance; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2020.127594
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: Salinization of freshwater ecosystems caused by human activities and climate change is a global problem that threatens freshwater resources and aquatic organisms. The aggravation of salinization and the presence of cyanobacterial blooms may pose a serious threat to crustacean zooplankton Daphnia . To test the consequences of these effects, we exposed Daphnia magna to the combined treatments of different chloride concentrations and three food compositions (100% Chlorella pyrenoidosa, 90% C. pyrenoidosa + 10% toxic Microcystis aeruginosa, 80% C. pyrenoidosa + 20% toxic M. aeruginosa ) for 21 days, recorded relevant life history indicators, and fitted them using Sigmoidal and Gaussian model if appropriate. Results showed that both increased chloride and the presence of toxic M. aeruginosa in the food had significantly negative effects on key life history traits and clearance rate, and the two factors also had a significant interaction on the survival, development, and reproduction of D. magna . The maximum values of the key life-history traits and clearance rate, the median effect chloride concentrations, and the optimal chloride concentrations derived from the models showed that the survival, reproduction, and clearance rate of D. magna were threatened by high chloride concentrations, which were exacerbated by the presence of toxic M. aeruginosa, but lower concentration of chloride was beneficial to D. magna to resist toxic M. aeruginosa . In conclusion, the combined effects of increasing chloride concentration and cyanobacterial blooms have severely adverse impacts on cladocerans, which may cause cladocera population to decline more rapidly and potentially disrupt the food webs of aquatic ecosystems. Graphical abstract: Image 1 Highlights: Increased chloride and cyanobacterial blooms may pose a serious threat to Daphnia. Chloride and toxic Microcystis had an interaction on life history of Daphnia. Variations in survival and reproduction can be fitted by Sigmoidal or Gaussian model. The negative effects of chloride on Daphnia were exacerbated by toxic Microcystis. Low chloride alleviates the harm of toxic Microcystis to Daphnia.