Abstract
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.
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Original Russian Text © T.N. Gerasimova, P.I. Pogozhev, 2010, published in Vodnye Resursy, 2010, Vol. 37, No. 6, pp. 671–681.
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Gerasimova, T.N., Pogozhev, P.I. The role of zooplankton in phytoplankton biomass decline and water transparency regulation in a water body subject to high organic and mineral load. Water Resour 37, 796–806 (2010). https://doi.org/10.1134/S0097807810060059
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DOI: https://doi.org/10.1134/S0097807810060059