Dissolved total nitrogen (N^sub t^) and total organic carbon (TOC) exports were measured from 30 catchments and regions draining 76 % of the Canadian landscape in order to estimate reactive N and organic C runoff losses to estuaries and the conditions that control them. N exports from the catchments were lower than measured in most of Europe and the United States due to significantly less agricultural activity and atmospheric deposition, especially in northern Canada. We produce statistical models using a number of geographical, climatic, agricultural, and population factors in order to predict N and C losses from the remaining regions. Using measured and extrapolated data, we estimated that the Canadian landscape exports 884 and 18,210 [...]
