Protecting the oligotrophic lakes of the English Lake District

Continuous monitoring of physico-chemical parameters enable the determinati on of water quality in lakes of the English Lake District, where nutrient e nrichment needs to be managed. In the case of Elterwater, severe deteriorat ion of water quality has resulted in the prolonged deoxygenation of the who le water column of the inner basin. More specifically, the phytoplankton di ffered between the three basins, with progressive increases in biomass and species indicative of eutrophy, between the oligotrophic outer to the hyper trophic inner basins. Remedial action is proposed for this lake, with conti nual monitoring of recovery.