Biotransformation of chlorpyrifos in riparian wetlands in agricultural watersheds: Implications for wetland management

► Chlorpyrifos biotransformation rates vary spatially and temporally in sediments. ► Phosphotriesterase enzyme activity is correlated with chlorpyrifos biodegradation. ► Hydroperiod differences affect the biotransformation rates. ► Wet-dry cycling is proposed as a wetland management strategy.