Fig. 4. Average annual Se concentration in inflow and outflow waters. Error bars are standard deviations from weekly measurements. BUL, sturdy bulrush; BAL, baltic rush; CORD, smooth cordgrass; RAB, rabbitfoot grass; SALT, saltgrass; CAT, cattail; B–W–B, bulrush–widgeon grass–bulrush; T–W–C, tule–widgeon grass–cattail.