Impact of phosphorus control measures on in-river phosphorus retention associated with point source pollution B. O. L. Demars, D. M. Harper, J.-A. Pitt, and R. Slaughter The Macaulay Institute, Craigiebuckler, Aberdeen AB15 8QH, United Kingdom Department of Biology, University of Leicester, Leicester LE1 7RH, United Kingdom Environment Agency, Station Road, Haddiscoe, Gt Yarmouth, Norfolk, NR31...