Oskina Natalia, Lopatina Tatiana, Anishchenko Olesya, Zadereev Egor
Institute of Biophysics, Federal Research Centre Krasnoyarsk Scientific Centre, Siberian Branch, Russian Academy of Sciences, 50/50 Akademgorodok, Krasnoyarsk, 660036, Russia.
Siberian Federal University, 79 Svobodniy Ave, Krasnoyarsk, 660041, Russia.
Bull Environ Contam Toxicol. 2019 Mar;102(3):335-340. doi: 10.1007/s00128-018-2473-7. Epub 2018 Oct 23.
The research aimed to determine critical concentrations of heavy metals at which survival of resting eggs of the cladoceran Moina macrocopa is negatively affected. Resting eggs' viability was not affected over a 30-days exposure towards copper, cadmium, zinc or nickel at concentrations up to 60-70 g/L. When resting eggs were exposed to sediment contaminated with heavy metals for 8 months, the hatching success was affected at 30 g copper/kg. Thus, resting eggs of Cladocera can tolerate heavy metals at concentrations that far exceed lethal concentrations of heavy metals to active life stage and exceed low or moderate levels of environmental pollution. Follow up investigation of life table parameters of hatchlings from resting eggs exposed to heavy metals demonstrated that neither lifespan nor fecundity of hatchlings differ from control animals. These results demonstrate that zooplankton may rapidly recover from resting egg bank once aquatic habitat becomes unpolluted.
该研究旨在确定枝角类大型溞休眠卵的存活率受到负面影响时重金属的临界浓度。在长达30天的暴露实验中，当铜、镉、锌或镍的浓度高达60 - 70μg/L时，休眠卵的活力并未受到影响。当休眠卵暴露于受重金属污染的沉积物中8个月时，在铜含量为30mg/kg时孵化成功率受到影响。因此，枝角类的休眠卵能够耐受的重金属浓度远远超过重金属对活跃生命阶段的致死浓度，并且超过了低或中等程度的环境污染水平。对暴露于重金属的休眠卵孵化出的幼体的生命表参数进行的后续调查表明，幼体的寿命和繁殖力与对照动物没有差异。这些结果表明，一旦水生栖息地变得未受污染，浮游动物可能会迅速从休眠卵库中恢复过来。
