[Objective] The aim was to explore living conditions of Bellamya sp. in polluted water with aquatic vegetation in different varieties. [Method] With wetland in winter simulated, effects of polluted water on SOD, MDA and survival rate of Bellamya sp. were researched to further study living condition of Bellamya sp. in wetlands at scale with aquatic vegetation. [Result] According to simulation, Altemanthera philoxeroides was highest in survival rate and Wolffia arrhiza was the lowest; SOD activity of Bellamya sp. changed from decreasing to increasing; MDA activities changed from increasing to decreasing in groups of Wolffia arrhiza, Salix saposhnikovii and control group and changed little in group of Ceratophyllum demersum and Alternanthera philoxeroides. The changes of MDA in group of Oenanthe stolonifer proved much more complicated. [Conclusion] Of the aquatic environment with five varieties of aquatic vegetation, combined group of Alternanthera philoxeroides and Bellamya sp. was of significant resistance against eutrophication, and the group of Wolffia arrhiza and Bellamya sp. proved with poorest in resistance.
[Objective] The paper was to investigate the survival conditions of Bel- lamya sp. in different aquatic vegetation habitats in Taihu area, so as to provide suitable evaluation indexes for environmental monitoring in the area. [Method] Equal density of Bellamya sp. was placed in 3 aquatic vegetation habitats （emerged plant area, submerged plant area and non-plant area） in ecological engineering construc- tion area near the west of Wangyuhe in Taihu, the survival rate, SOD activity, MDA content and P450 enzyme activity of Bellamya sp. during outbreak and non-outbreak stage of cyanobacteria were determined, and the correlation between these indexes and ammonia nitrogen content of lake water was also analyzed. [Result] During the outbreak stage of cyanobacteria, the survival rates of Bellamya sp. in emerged plant area, submerged plant area and non-plant area were 0%, 55.2% and 89.3%, re- spectively, SOD activity first decreased and then increased, the change trend of MDA content was opposite with SOD change trend, P450 enzyme activity continu- ously decreased. During non-outbreak stage of cyanobacteria, the survival rates of Bellamya sp. in 3 habitats were 90.6% ,98.8 and 99.5%, respectively, SOD activity first decreased and then increased, MDA content first increased and then decreased, the changes of P450 enzyme activity were not regular. SOD activity of Bellamya sp. during 2 phases had significantly negative correlation with ammonia nitrogen content of lake water, MDA content had significantly positive correlation with ammonia nitro- gen content of lake water only during non-outbreak stage of cyanobacteria, P450 enzyme activity has no significant correlation with ammonia nitrogen content. This in- dicated that when Bellamya sp. was used to evaluate the impact of aquatic vegeta- tion on benthic animals, P450 enzyme activity was not the suitable indicator. [Conclusion] SOD activity in muscle tissue of Bellamya sp. could be used as the indica- tor for evaluation of habitat, MDA could be used as indicator for dete
