Effects of dietary cadmium exposure on reproduction of saltwater cladoceran Moina monogolica Daday: Implications in water quality criteria.
The chronic toxicity of dietary cadmium to the saltwater cladoceran Moina monogolica Daday and its relative toxicity compared with aquatic exposure were investigated in the present study. The microalgae Chlorella pyrenoidosa, exposed to cadmium in growth inhibition tests, had a 96-h median effective concentration (EC50) of 81.2 microg Cd/L (95% confidence intervals [CIs] = 71.9-95.1). C. pyrenoidosa exposed for 96 h to sublethal dissolved cadmium concentrations in the range 4.10 +/- 0.30 to 70.29 +/- 0.31 microg/L resulted in algal cadmium burdens up to 73.86 x 10(-16) g Cd/cell. Cellular cadmium burdens accumulated in a dose-dependent manner, whereas cell densities inversely declined from 670 x 10(4) to 38 x 10(4) cells/ml with exposure to the increasing aqueous cadmium concentrations. C. pyrenoidosa preexposed to cadmium and used as food in a chronic 21-d toxicity test with the cladoceran M. monogolica, containing no added dissolved cadmium, inhibited reproduction. Significant reductions of the net reproduction rate (R(0)) per brood were observed in all broods, and the decline in the number of neonates produced increased with each subsequent brood. The cadmium concentration (4.10 +/- 0.30 microg/L) in the algal culture water that produced the lowest algal cadmium burden (2.85 +/- 0.76 x 10(-16) g Cd/cell) was shown to inhibit M. monogolica reproduction and was compared with the water quality criteria (WQC) of China. This comparison indicated that dietary exposure to cadmium may cause sublethal responses at concentrations below the current cadmium WQC of China for aquaculture.
Wang
Zaosheng
Z
Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Bouleward, Jimei District, Xiamen, 361021, China.
Yan
Changzhou
C
Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Bouleward, Jimei District, Xiamen, 361021, China.
Hyne
Ross V
RV
Centre for Ecotoxicology, Ecotoxicology and Environmental Contaminants Sections, Department of Environment and Climate Change, 480 Weeroona Road, P.O. Box 29, Lidcombe, New South Wales 2141, Australia.
D000818:Animals; D002104:Cadmium / Q000633:toxicity*; D002708:Chlorella / Q000187:drug effects* / Q000254:growth & development; D033361:Cladocera / Q000187:drug effects*; D012098:Reproduction / Q000187:drug effects; D014874:Water Pollutants, Chemical / Q000633:toxicity*
D014874:Water Pollutants, Chemical; D002104:Cadmium
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