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Efectos del cromo hexavalente y un carbamato sobre dos especies de Cladoceros

, : Efectos del cromo hexavalente y un carbamato sobre dos especies de Cladoceros. Acta Biologica Colombiana 4(1): 21-34

The effect of a carbamate and a heavy metal was evaluated on survival, sexual maturation aud fertility of the acuatic cladocerans Daphnia magna and Daphnia obtusa. Acute toxicity-LC50 and chronic toxicity-CV values were determined. For D. magna LC50 Cr+6 was 0.35 mg/l and CV 0.20 mg/l. For D. obtusa LC50 Cr+6 was 0.04 mg/l and VC 0.009 mg/l. For D. magna LC50 Methomyl was 0.l0 mg/l and CV 2.2 X 10-3 mg/l. Exposure of D. obtusa to Methomyl yielded a LC50 of 0.005 mg/l, and response of animal at sublethal concentrations were irregular, therefore CV statistical confidence was poor and not shown.


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