TitleEffects of Microcystis aeruginosa on life history of water flea Daphnia magna
Publication TypeJournal Article
Year of Publication2011
AuthorsLiu, L, Li, K, Chen, TY, Dai, X, Jiang, M, Diana, JS
JournalChinese Journal of Oceanology and Limnology
Pagination892 - 897
Date Published2011
ISBN Number0254-4059
KeywordsDaphnia magna, life history, Microcystis aeruginosa, toxicity

Cyanobacterial blooms in eutrophic freshwater systems are a worldwide problem, creating adverse effects for many aquatic organisms by producing toxic microcystins and deteriorating water quality. In this study, microcystins (MCs) in Microcystis aeruginosa, and Daphnia magna exposed to M. aeruginosa, were analyzed by HPLC-MS, and the effects of M. aeruginosa on D. magna were investigated. When D. magna was exposed to M. aeruginosa for more than 2 h, Microcystin-LR (MC-LR) was detected. When exposed to 1.5 x 10(6), 3 x 10(6), 0.75 x 10(7), and 1.5 x 10(7) cell/mL of M. aeruginosa for 96 h, average survival of D. magna for treatments were 23.33%, 33.33%, 13.33%, 16.67%, respectively, which were significantly lower than the average 100% survival in the control group (P < 0.05). The adverse effects of M. aeruginosa on body length, time for the first brood, brood numbers, gross fecundity, lifespan, and population growth of D. magna were density-dependent. These results suggest that the occurrence of M. aeruginosa blooms could strongly inhibit the population growth of D. magna through depression of survival, individual growth and gross fecundity. In the most serious situations, M. aeruginosa blooms could undermine the food web by eliminating filter-feeding zooplankton, which would destroy the ecological balance of aquaculture water bodies.

Notice of Publication Number

NOP 11-271 (English)