水生态学杂志Issue(2)：39-45,7.DOI:10.15928/j.1674-3075.2015.02.007
拟老年低额蟤和大型蟤控制水华藻类的实验研究
Potential for Using Simocephalus vetuloides and Daphnia magna for Controlling Algal Blooms
摘要
Abstract
Foraging of algae by zooplankton is the basic principle behind the use of biomanipulation to controll algal blooms.Daphnia is an important fauna in the freshwater food chain and much research has been carried out on its use for controlling phytoplankton.Microcystis aeruginosa produces toxic-algae blooms in warm eutrophic waters and, because blooms tend to be long lasting and hard to control,research has focused on prevention and control of aglae blooms.The representative algal species Microcystis aeruginosa (non-toxic CHAB109;toxic PCC7806 ) and Scenedesmus obliquus and the large zooplankton species Simocephalus vetuloides and Daphnia magna were chosen to study zooplankton grazing on algal growth and the factors that influence grazing in order to verify the feasibility and effectiveness of different zooplankton species in controlling of algae bloom.Foraging trials were run under different algal densities,light conditions and zooplankton densities.Zooplankton and phytoplankton in all trials were sampled and analyzed each day at the same time.Results indicate that the removal rates of Scenedesmus obliquus and CHAB109 in Scenedesmus obliquus group and CHAB109 group (both initial density of 1.02 ×106 cells/mL)were 54.20% and 6.45% by Simocephalus vetuloides,and 49.77% and 64.77% by Daphnia magna.The removal rates of Scenedesmus obliquus and CHAB109 in mixture group of Scenedesmus obliquus with CHAB109 were 60.65%and 34.43% by Simocephalus vetuloides,higher than those in single algae groups.The results also reveal that zoo-plankton consumed larger amount of algae and displayed more effective removal of algae in the dark.The removal rate of PCC7806 with an initial density of 3.023 ×105 cells/mL was 32.37% by Simocephalus vetuloides under alu-minium foil shading.In the trials,mature Daphnia magna (7 d)had higher removal rates than the larvae due to the larger size and greater need for food and the removal rate increased with zooplankton density.However,the growth of zooplankton was also affected by the density of alage,with lower survival rate of zooplankton at higher al-gae density.Thus,zooplankton species diversity,size and density must be considered when used for algae control.关键词
浮游动物/栅藻/铜绿微囊藻/水华Key words
zooplankton/Scenedesmus obliquus/Microcystis aeruginosa/algal bloom分类
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陈微,龚桂玲,王闪,张睿,仰凡,何金,宋碧玉..拟老年低额蟤和大型蟤控制水华藻类的实验研究[J].水生态学杂志,2015,(2):39-45,7.基金项目
国家“十二·五”水专项；水体污染控制与治理科技重大专项“洱海水污染防治、生境改善与绿色流域建设技术及工程示范项目”课题四之子课题“洱海浮游动物控藻机制及增殖保育技术”（2012ZX07105-004-002-001）。 （）
