Editing Limnology (section)

==== Phosphorus ====
Another important nutrient in aquatic systems is [[phosphorus]]. Phosphorus has a different role in aquatic ecosystems as it is a limiting factor in the growth of phytoplankton because of generally low concentrations in the water.<ref name="limnology book" /> Dissolved phosphorus is also crucial to all living things, is often very limiting to primary productivity in freshwater, and has its own distinctive ecosystem [[Phosphorus cycle|cycling]].<ref name="water quality book" />