What I tried to point out was that the information that was obtained through the intensive monitoring research work in 2008 showed that tributaries contributed 234% more phosphorus load to the system than point sources.
The way the study was done, they looked at various different landscape types and the impacts on the nearshore. They showed that the mussels alone were helping to get the Cladophora growth going, but it was also those tributaries, especially from urbanized areas, affecting the greatest amount of algal growth.