Accumulation of Cd-109 by second-generation chironominae propagated from wild populations sampled from low-, mid-, and high-saline environments
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| Authors: | Barjaktarovic, L; Bendell-Young, LI |
| Year: | 2001 |
| Journal: | Archives of Environmental Contamination and Toxicology 40: 339-344 |
| Title: | Accumulation of Cd-109 by second-generation chironominae propagated from wild populations sampled from low-, mid-, and high-saline environments |
| Abstract: | Our objective was to determine if second-generation (F2) chironomids propagated from adults of larvae sampled from low-, mid-, and high-saline environments differed in their ability to accumulate cadmium from their environment. Second-generation chironomids cultured from wild populations were exposed to Cd-109 at 0, 0.7, and 4.3 ppt salinity for 10 days, at which time survival and amounts of Cd-109 accumulated were determined. Cultures included two of Chironomus tentans from a freshwater lake (lake 78; 0 ppt), and the euryhaline C. athalassicus from a mid- (lake 71; 0.7 ppt) and high (lake 56; 4.3 ppt)-saline environment. A laboratory-reared culture of C. tentans was included as a positive control. Species-dependent accumulation of Cd-109 occurred; second-generation C. athalassicus cultured from the high-salinity lake survived in the three salinities and accumulated significantly greater amounts of the radiotracer at 0 and 0.7 ppt compared to the second-generation freshwater species, C. tentans. Second-generation C. athalassicus cultured from lake 71 also survived all salinities with Cd-109 accumulation tending to be greater than the freshwater species at the mid-salinity range. In contrast, the freshwater species cultured from lake 78 as well as the laboratory-reared culture did not survive the highest salinity of 4.3 ppt and accumulated less Cd-109 compared to the species from the high-saline environments. Species-dependent differences in metal accumulation need to be considered in studies that assess metal concentrations in aquatic organisms across an environmental gradient, such as salinity. |
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