Updated and moved to http://dx.doi.org/10.6073/pasta/8b81b5b0cf936c8b2bb173adab506fd7 Cations for the Kuparuk River near Toolik Field Station, Alaska for select years from 1989-2000 and 2011 to present.

Samples were collected and analyzed for the cations potassium, sodium, calcium, and magnesium. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Cation samples were analyzed for the following summers on the Kuparuk River: 1989, 1990, 1993, 1994, 2000, 2011 & 2012.