Dissertation > Environmental science, safety science > The basic theory for the Environment and Science > Environmental Biology > Environmental botany

Research on Relationship between M. Aeruginosa and Cyclops

Author LiZuoYang
Tutor RenNanZuo
School Harbin Institute of Technology
Course Environmental Science and Engineering
Keywords Microcystis Aeruginosa Cyclops Growth Influence Ecological Relationship
CLC X173
Type Master's thesis
Year 2009
Downloads 29
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With the rapid development of industry and improvement of living standard, the pollution which becomes more and more seriously can result in eutrophication, and breakout of water bloom and Cyclops is more frequently. Both of them have did great harm to mankind’s production and life as well as caused a serious impact on economy and society. The breakout of Cyclops and Microcystis Aeruginosa is one of the most concerned problems by human beings and is also the key of environment treatment. The relationship between M. aeruginosa and Cyclops has been studied in the laboratory here. The factors such as different inoculation proportion, pH, P concentration, N:P, and other meteorological factors were studied to determine their effect on the growth of M. aeruginosa, Cyclops, and microcystins (MCs) production of M. aeruginosa by using static simulation, and the toxigenic characteristic of Microcystis Aeruginosa was also studied in this paper. This study provides a new idea and theoretical basis on water bloom and breakout of Cyclops.The results indicate that if the concentration of Microcystis Aeruginosa is lower than 106/mL and the quantity of Cyclops is less than 50/1000mL,the food chain and antagonism relationship exist in Microcystis Aeruginosa and Cyclops, and if the quantity of Cyclops is greater than 100/1000mL and the concentration of microcystis aeruginosa is above 107/mL,the relationship between them is reciprocal inhibition, which aim is at contesting with limited space, and the relationship degree is determined by biomass in the limited space.Toxin in intracellular and extracellular was extracted from Microcystis Aeruginosa by using boiling water bath and solid phase extraction, and was also analyzed by high performance liquid chromatography (HPLC). The results show that secretion of toxin in Microcystis Aeruginosa increased with cellysis on the condition that Cyclops were existence and in the same time, the toxin in extracellular also increased since cells broken down and released their toxins. The poisoning effect to Cyclops was poison accumulation which was produced by feeding.M. aeruginosa and Cyclops grew well on the condition of pH of 7.0 to 9.0, P concentration of 5.0 to 25.0mg/L, and N:P of 25 to 50. When the conditions were pH of 7.0, P concentration of 25.0mg/L, and N:P of 50, the inhibition of Cyclops on M. aeruginosa was more seriously, and the M. aeruginosa grew more slowly.Studying on the ecological relationship between Cyclops and Microcystis Aeruginosa , we know that the adaptabilities of M. aeruginosa and Cyclops were strong, and they could regulate the environment to make it more suitable for themselves. This was why M. aeruginosa and Cyclops could acquire advantage of competition and result in high frequency of breakout of water bloom.

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