Cadmium−Copper Antagonism in Seaweeds Inhabiting Coastal Areas Affected by Copper Mine Waste Disposals

Pontifical Catholic University of Chile, CiudadSantiago, Santiago Metropolitan, Chile
Environmental Science and Technology (Impact Factor: 5.33). 08/2006; 40(14):4382-7. DOI: 10.1021/es060278c
Source: PubMed


Cadmium and copper accumulation by macroalgae was studied in a coastal area exposed to upwelling events and high levels of Cu, the latter resulting from mine disposals. Eight species were studied, and all had very high concentrations of Cd outside of the Cu-contaminated area. Cu in algal tissues was much higher in contaminated than in reference sites. High Cu appeared to suppress Cd bioaccumulation; Cd in algal tissues was much lower in the Cu-contaminated area than in the reference sites. Transplant experiments with Lessonia nigrescens revealed a depuration of Cd in individuals transplanted to areas with high Cu. However, Cd depuration occurs more slowly than Cu uptake. These differences suggest that while Cd and Cu are linked mechanistically, itis nota simple substitution. Overall, the work confirms that macroalgae are useful indicators of metal contamination and may be used as in situ biomonitors for labile forms of metals, like free Cu2+. However, antagonistic relationships between metals must be clearly understood in order to properly interpret their concentrations in macroalgae.


Available from: Santiago Andrade, Mar 05, 2014
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    • "Whereas, no limitation of primary productivity has been reported in open ocean systems as a result of low copper concentrations , a role of copper in iron uptake by phytoplankton and in nitrogen cycling has been proposed (Jacquot et al., 2013; Maldonado et al., 2006; Peers et al., 2005). In contrast, detrimental effects on marine microbial organisms of enhanced copper concentrations have been reported in perturbed estuarine and coastal systems (Andrade et al., 2006; Braungardt et al., 2007). An increase in free cupric ion concentrations due to ocean acidification would have negative effects on marine ecosystems. "
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    • "Darmstadt, Germany) for 96 h. Two series of copper concentrations were used: (1) 5, 10 and 20 μg Cu l −1 to cover the current concentrations at copper-polluted sites (Stauber et al. 2005, Andrade et al. 2006), and (2) 40, 100 and 300 μg l −1 , representing historic concentrations at the same sites (Castilla and Correa 1997, Correa et al. 1999). Controls without copper addition were included. "
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    • "While site selection and sampling protocols habitually ignored these confounding factors, and concurrent analyses of ambient seawater, if done at all, were mostly too flawed to exhibit practicably predictive correlations with metal contents of the biomass, many authors still forged ahead with attempts to interpret their observations in terms of local pollution sources. Rare exceptions are a recent investigation by Andrade et al. (2006), and an older one by Seeliger and Edwards (1977) who reported a roughly linear dependence of biomass contents on seawater concentrations for several metals and macroalgal species on the New Jersey side of Raritan Bay, but did not speculate if and how these relations might vary geographically, or from year to year. "
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