Abstract:Several studies have demonstrated the influence of submerged macrophytes on eutrophication or water quality with different results. To assess the effect of a submerged macrophyte, one should evaluate the ecosystem throughout a year in combination with the growth curve of the plant. The growth curve of Potamogeton crispus was determined from seven investigations from October 2002 to May 2003 in a reservoir with 70% of area covered by P. crispus. The effects of the grass on water quality were assessed by an...