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It is shown that large-size zooplankton can be used as a natural filter in flow-through plants for reducing the trophic status of water bodies and improve water transparency. Experiments in Chistye Prudy pond in the period of blue-green algae blooming show large-size zooplankton to reduce phytoplankton biomass in the pond throughout the period of phytoplankton growth. Daphnia magna specimens (with a biomass of 92 to 3450 mg/l) in lothic ecosystems are found to reduce the biomass of dominating Anabaena spirodes blue-green algae when this biomass attains its maximum. 相似文献
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The filtration capacity of large-size cladoceras is examined. Cladoceras Simocephalus vetulus with a biomass of 1.6 g/l in flow-through ecosystems isolated from ichthyifauna can reduce phytoplankton biomass from 2.89 to 0.12 mg/l within 1 h. Particularly, the biomass of blue-green algae Anabaena spiroides decreases from 0.14 to 0.01 mg/l, and their filaments shorten. In the period when phytoplankton biomass in the water body was at maximum, the activity of cladoceras (biomass of 2.1 g/l) resulted in a decrease in this biomass in flow-through ecosystems by a factor of 13.6 (down to 0.34 mg/l). The decrease in phytoplankton biomass in flow-through ecosystems facilitated changes in its composition in the water body (an increase in the share of green algae) and was accompanied by an increase in water transparency.__________Translated from Vodnye Resursy, Vol. 32, No. 3, 2005, pp. 371–379.Original Russian Text Copyright © 2005 by Pogozhev, Gerasimova. 相似文献
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The role of zooplankton in the regulation of phytoplankton biomass growth and water transparency in water bodies polluted by nutrients 总被引：1，自引：0，他引：1
Experimental studies were carried out in a water body near Moscow and in a flow-through system in the territory of fertilized
agricultural fields. It is shown that under high biogenic load, at the concentrations Ptot = 0.14 mg P/l, Pmin = 0.07 mg P/l, and the ratio N: P = 7.9: 1, in early summer, and in the absence of plankton-eating fish, zooplankton was
regulating phytoplankton development and contributed to the preservation of high water transparency. At the biomass ratio
of plant-eating zooplankton to eatable phytoplankton from 0.6 to 42.2, zooplankton can reduce the eatable part of phytoplankton
within a day. The main consumers of the eatable fraction of phytoplankton biomass were large-size filterers Daphnia longispina. 相似文献
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Data of field experiments conducted in a eutrophic water body were used to assess the effect of zooplankton on microalgae blooming. The experiment was based on the use of mesocosms to isolate the components of zooplankton and ichthyofauna ecosystems. The population Daphnia longispina is shown to reduce the population of cyanobacteria Anabaenaflos-aquae by a factor of 350 as compared with the water body, thus allowing the phase of highly-transparent water to extend to the mid-summer. D. Longispina can reduce the population of Microcystis aeruginosa, which is associated with the second period of the transparent-water phase. The filtration activity of zooplankton is shown to be able to recover the quality of eutrophic water bodies. 相似文献
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Studying the potential of food chain filterers in the processes of de-eutrophication of water bodies
The functioning of running-water ecosystem is shown to be related to the realization of the potential of large-size zooplankton as a natural filter of blue-green algae and to be an important link in the processes of de-eutrophication of water bodies. 相似文献
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Under biogenic load and at high abundance of ichthyofauna (the concentration of total phosphorus Ptot = 0.20 mg P/l, mineral phosphorus Pmin = 0.13 mg P/l, and at the ratio N: P = 4: 1 in early summer), zooplankton reduced phytoplankton biomass during summer and autumn and determined high water transparency, reaching >50% of the depth of the water body. It was found that, with a passage of ichthyofauna to artificial food, the trophic press of plankton-eating fish on zooplankton decreases. Under such conditions, with the biomass ratio of plant-eating zooplankton to edible phytoplankton between 0.4 and 7.9, zooplankton can reduce phytoplankton biomass within a day. The major portion (up to 100%) in phytoplankton biomass reduction was due to large-size filterers-phytophages Daphnia longispina and verticators Asplanchna priodonta helvetica. 相似文献
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Water Resources - The study has been focused on the population composition dynamics and trophic relationships of Simocephalus vetulus (O.F. Müller, 1776) in the absence of the food stress of... 相似文献
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The study is focused on the ability of filterers–phytophages Daphnia longispina O.F. Mueller to suppress blooming in shallow-water bodies in Moscow oblast. The effect of phytoplankton development on the composition of daphnia populations is studied. With the predominance of small-cell (<40 μm in length) green, yellow-green, and euglena algae in the phytoplankton and, accordingly, in the nutrient budget of daphnia, the biomass of D. longispina (12 mg/L) is 1.5–6.0 times greater than that in the water bodies where the phytoplankton shows the predominance of Aphanizomenon flexuosum Komárek et Ková?ik (filamentous cyanobacteria) and Volvox polychlamys Korshikov (cenobial green algae). The mean fertility of the reproducing organisms of D. longispina (the number of eggs per female reached 11) was also higher in the former case. 相似文献
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