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Allelophathic Effect of Sargassum Thunbergii on Skeletonema Costatum and Its Response to CO2 Enrichment

Author: HouYing
Tutor: TangXueZuo
School: Ocean University of China
Course: Marine biology
Keywords: Sargassum Skeletonema costatum The role of grams of raw CO2 enrichment
CLC: X55
Type: Master's thesis
Year: 2010
Downloads: 33
Quote: 0
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Abstract


The red tide is a global ecological disaster, the red tide outbreak a serious impact on the sustainable development of the marine economy, and therefore seek effective and environmentally friendly HAB control methods to become one of the people flurry. Grams of raw red tide microalgae macroalgae the red tide Prevention is one of the hot spots of red tide research work. Atmospheric CO2 concentration has also become one of the major global environmental issues, the CO2 enrichment grams of raw marine algae and their mutual reveals the impact of global climate change on marine ecosystems. Macroalgae Sargassum (Sargassum thunbergii) and red tide microalgae Skeletonema costatum (Skeletonema costatum) materials, grams of raw Sargassum costatum and its changes in response to CO2 enrichment grams born between algae explore the possible mechanism of its response to CO2 enrichment, analysis of the possibility of the use of large-scale seaweed red tide prevention and control. The experimental results are as follows: 1. Sargassum Skeletonema costatum grams into force should Sargassum fresh tissue and dry powder Skeletonema costatum population growth has inhibitory effect, population cell density and growth parameters (environmental load capacity K and the maximum growth rate r) significantly lower (P lt; 0.05), with the increase in the concentration of Sargassum fresh tissue and dry powder, inhibition becomes more obvious; and high concentration (2.4 gFD · L-1) of dry powder Skeletonema costatum has a lethal effect. Sargassum fresh tissue obtained by linear interpolation Skeletonema costatum half effectively inhibit concentration EC50 of approximately 3.5 g FW · L-1, dry powder Skeletonema costatum half effective inhibitory concentration EC50 of approximately 1.8 g FD · L-1. Confirmed that the Sargassum pair the Skeletonema costatum exists grams shall enter into force. Thunbergii aqueous extracts significantly inhibited the growth of Skeletonema costatum inhibition increased with the concentration and strengthen. The Sargassum culture water filtration solution with significant growth of Skeletonema costatum inhibitory and lethal effects. Confirmed the role of grams of raw Sargassum Skeletonema costatum grams biomass to the environment secretion. After a high temperature of boiling water-soluble extract of Sargassum and culture water filtration solution costatum population growth still showed significant inhibition. Sargassum culture water filtration solution either in a one-time or semi-continuous add costatum population growth has been significantly inhibited completely to death and at the end of the experiment. Secreted by the proof of Sargassum biomass grams relatively stable. 2.CO2 enrichment cause changes take effect should Skeletonema costatum grams Sargassum results show that CO2 enrichment culture of fresh tissue, dry powder and water-soluble extract costatum cell density and population growth parameters (K, and the maximum growth rate of environmental load capacity r) was significantly lower (P lt; 0.05), caused by CO2 enrichment culture Sargassum effective Skeletonema costatum grams should change it Skeletonema costatum algae population growth inhibitory effect of strengthening. Sargassum CO2 enrichment culture fresh tissue, dry powder and water-soluble extract effective in costatum grams should strengthen and develop water filtration solution growth of Skeletonema costatum populations enrichment before significantly inhibited the changes had no significant effect after enrichment. Therefore, we speculated that the CO2 enrichment culture may change Sargassum Skeletonema costatum grams of raw role, from changes in the mode of action by secreting grams biomass cells in direct contact with the passing.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Marine pollution and its prevention
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