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Effects of lindane and deltamethrin on zooplankton communities of experimental ponds



Effects of lindane and deltamethrin on zooplankton communities of experimental ponds



Hydrobiologia 232(2): 157-168



Two insecticides, lindane (321 .mu.g l-1) and deltamethrin (13 .mu.g l-1) were employed in a four mesocosm experiment (two ponds of 10 m3 and two of 16 m3) to asses the impact of water pollution by pesticides. Resistance of the different zooplankton species was variable and depended upon both the group and the insecticide concentration. No effect of lindane was observed on macrozooplankton such as Cladocera and Copepoda. In the deltamethrin-treated pond, all species of zooplankton were found dead a day after the treatment. The microzooplankton (Rotifera and copepod nauplii) were highly susceptible to both insecticides. Although the larvae of Chaoborus were present in the ponds after the treatments, their density decreased (less than 1 individual l-1). The elimination of filter-feeding zooplankton by deltamethrin was followed by an increase of the concentration of chlorophyll a in the post-treatment period. Two months later the original zooplankton population recovered, with the addition of a new and dominant species: Ceriodaphnia reticulata.

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Accession: 002608273

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DOI: 10.1007/bf00017475



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