Study on acute toxicity of two Karenia (Dinophyceae) species to rotifer Brachionus plicatilis
LI Si1,2, CEN Jing-yi1,2, WANG Jian-yan3, LV Song-hui1,2
1. College of Life Science and Technology, Jinan University, Guangzhou 510632, China;
2. Key Laboratory of Aquatic Eutrophication and Control of Harmful Algae Blooms of Guangdong Higher Education Institutes, Guangzhou 510632, China;
3. Department of Science Research, Beijing Museum of Natural History, Beijing 100050, China
Abstract：The toxicity effect of Karenia species (Karenia selliformis and Karenia umbella) on rotifer Brachionus plicatilis has been studied. The results showed that two strains of K. selliformis and K. umbella had significant toxic effect on B. plicatilis. The toxicities of the two species were positively correlated with cell density in a short test time (2 hours), with a coefficient (R2) of 0.96 and 0.92, respectively. The 2 h LD50 of K. selliformis and K. umbella on B. plicatilis was 2750/mL and 14011/mL, respectively, indicating a more intense toxicity of K. selliformis. Comparison of the toxicity of different algal fractions (culture cells, filtrate and broken cells) showed that culture cells had intense effects, while the filtrate and broken cells of both species have no toxicity on B. plicatilis. The direct contact with culture cells is to be one of the key factors that resulted in the deaths of rotifers.
LI Si,CEN Jing-yi,WANG Jian-yan et al. Study on acute toxicity of two Karenia (Dinophyceae) species to rotifer Brachionus plicatilis[J]. Marine Environmental Science, 2018, 37(1): 28-32,69.
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