Metal concentrations in large zooplankton from three karst reservoirs with different eutrophic status (Hongfeng Lake reservoir, Baihua Lake reservoir, and Aha reservoir) in Guizhou Province, China, were investigated. Samples of zooplankton were collected in 2014 and 2015. It was found that accumulation of metals in zooplankton was significantly correlated with Chl-a (chlorophyll a), which can be attributed to the characteristic distribution of species of phytoplankton. A low concentration of metals in water means a higher bioaccumulation factor (BAF) and a stronger transfer to zooplankton via the trophic chain, and hence a higher ecological risk. Zooplankton in the eutrophic Aha reservoir had lower concentrations of Fe (mean 1264.25 mg/kg) than in Hongfeng (mean 2566.07 mg/kg) and Baihua (2246.87 mg/kg) in 2014-2015, because of high TP (Total Phosphorus) concentration, which has an affinity with suspended particles matter. A high level of Cd (mean 0.62 mg/kg) was found in Hongfeng. This study shows that zooplankton in the eutrophic Aha reservoir had higher concentrations of metals (Mn, mean 590.47 mg/kg; Pb, mean 7.6 mg/kg; Cr, mean 26.31 mg/kg; Ni, mean 8.54 mg/kg; Zn, mean 225.73 mg/kg; and Cu, mean 238.33 mg/kg) than in the mesotrophic Hongfeng and Baihua reservoirs. Thus, the eutrophic status was significantly, positively correlated with high concentrations of metals in the zooplankton, as also observed in other reservoir studies.
AlvenslebenN. V.StookeyK.MagnussonM.HeimannK., 2013.
Salinity tolerance of Picochlorum atomus and the use of salinity for contamination control by the freshwater cyanobacterium Pseudanabaena limnetica.
Spatial and temporal variation in mercury bioaccumulation by zooplankton in Lake Champlain (North America).
Environment Canada, 2004. Canadian guidance framework for the management of phosphorus in freshwater systems. National Guidelines and Standards Office, Water Policy and Coordination Directorate, Environment Canada, Report, 1-8: 64-65.
Sediment deposition and its nutrient volume in Baihua Lake and Aha Lake.
Journal of Guizhou Normal University,
LiuB.YanH.-Y.WangC.-P.LiQ.-H.GuédronS.SpangenbergJ. E.FengX.DominikJ., 2012.
Insights into low fish mercury bioaccumulation in a mercury-contaminated reservoir, Guizhou, China.
LuengenA. C.PeterR. T.FlegalA. R., 2007.
Contrasting biogeochemistry of six trace metals during the rise and decay of a spring phytoplankton bloom in San Francisco Bay.
RazaviN. R.QuM.-Z.ChenD.-M.ZhongY.RenW.-W.WangY.-X.CampbellL. M., 2015.
Effect of eutrophication on mercury (Hg) dynamics in subtropical reservoirs from a high Hg deposition ecoregion.
Spatial and temporal variations of total and methylmercury concentrations in plankton from a mercury-contaminated and eutrophic reservoir in Guizhou Province, China.
Environm. Toxicol. Chem.,
YanH. Y.FengX.-B.ShangL.-H.QiuG.-L.DaiQ.-J.WangS.-F.HouY.-M., 2008.
The variations of mercury in sediment profiles from a historically mercury contaminated reservoir, Guizhou Province, China.
Sci. Total Environm.,