Effects of cyanobacterial accumulation and snail grazing on the growth of vallisneria natans The reproductive reaction and oxidative stress responses sensitivity of Bellamya aeruginosa to the chronic exposure of lead-contaminated sediments Mutualistic relationship between freshwater snails and aquatic macrophytes Bioaccumulation of sediment heavy metals in Bellamya aeruginosa and its relations with the metals geochemical fractions.