%0 Generic %D 1987 %T Macro-floral assemblages in upland Welsh streams in relation to acidity and their importance to invertebrates. %A Ormerod, S.J. %A Wade, K.R. %A Gee, A.S. %B Freshwater Biology %V 18 %P 545-557 %0 Generic %D 1984 %T The effects of acidification on the ecology of streams in the upper Tywi catchment in west Wales. %A Stoner, J.H. %A Gee, A.S. %A Wade, K.R. %B Environmental Pollution (series A) %V 35 %N 125-157