Fig. 3. Biomass change (mg dry mass/31 d) of Physa, Lymnaea, Elimia, and Helisoma among carbamazepine (CBZ) treatments in a mesocosm experiment in summer 2013. N=4. Bars represent
mean ± 1 SE. *Denotes significant difference of the biomass change of gastropods with 2000 ng/L of carbamazepine (P b 0.05) compared to the diversity in control or 200 ng/L
carbamazepine mesocosms.