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aquatic macrophytes in flowing waters. Ecol. Applic. , 1(3), 249-257. Chambers, P. A., DeWreede, R. E., Irlandi, E. A., Vandermeulen, H. (1999). Management issues in aquatic macrophyte ecology: A Canadian perspective. Can. J. Bot. 77, 471-487. Cimdiņš, P., Druvietis, I., Liepa, R., Parele, E., Urtāne, L., Urtāns, A. (1995). A Latvian catalogue of indicator species of freshwater saprobity. Proc. Latvian Acad. Sci., Section B , No. 1/2, 122-133. Clarke, S. J., Wharton G. (2001). Sediment nutrient characteristics and aquatic macrophytes in lowland English rivers. Sci