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The Biological Chain Study of Algae Control in the Baiyangdian Lake

Author: ZhangYueWei
Tutor: LiuCunQi
School: Hebei University
Course: Hydrobiology
Keywords: Eutrophication Biomanipulation The food chain Zooplankton
CLC: X52
Type: Master's thesis
Year: 2009
Downloads: 42
Quote: 0
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Abstract


Water eutrophication has become increasingly urgent global environmental issues, water eutrophication governance. The Baiyangdian the situation is not optimistic ,2005-2006 survey results show that the Baiyangdian Lake in severe eutrophication. Baiyangdian eutrophication problem, design a control algae as the main zooplankton food chain, and the study of of Feeding the relationship between control algae food chain trophic level in laboratory conditions, the proposed solution to the water eutrophication The problem of biological manipulation technology program. The Baiyangdian cladocerans, copepods and other zooplankton, phytoplankton and water quality physical and chemical indicators survey to determine the extent of eutrophication in Baiyangdian, and lead to eutrophication of the main advantages of algae, and zooplankton cladocerans and copepods dominant species. Further build the main control algae zooplankton food chain: to cause the major algae → Baiyangdian eutrophication large dominant species of Cladocera → Cladocera populations affect dominant species of copepods. The results show that: the elderly low amount magna (Simocephalus vetulus) and Daphnia pulex (Daphnia pulex) grazing the size of the force are influenced by the algae biomass, algae biomass their feeding speed Cladocera algae feeding indoor has a saturation value that exceeds this value, its feeding speed is decreased. Experiment when Chlorella pyrenoidosa (Chlorella pyrenoidosa) and the four gate alga (Scenedesmus quadricanda), biomass was 14.75 mg / L and 35 mg / L, Daphnia pulex feeding rate began to decline; Scenedesmus quadricauda The biomass of more than 35 mg / L elderly the low amount magna feeding speed began to decline, for to Chlorella pyrenoidosa its feeding speed been increasing. Also measured the the horns these two branches of Chlorella pyrenoidosa and Scenedesmus quadricauda treatment rate and removal efficiency, as well as these two algae selective. Neighbor Cyclops (Cyclops vicinus) the Cladocera indoor feeding ecology research results show that: the neighbor Cyclops feeding range, close neighbors Cyclops prefer smaller cladocerans feeding individuals. Such close neighbors Cyclops will be late spring, early summer blooms Cladocera larvae cause a certain degree of impact, thereby affecting the food chain control algae control algae. Also increases as the temperature increases the feeding rate of the neighbor Cyclops, which to a certain extent also exacerbated by the impact of large Cladocera. In short, on the basis of the study of Baiyangdian plankton feeding, finalized a significant control effect of Baiyangdian algae control algae food chain.

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Water pollution and its control
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