Dynamics of dissolved organic nitrogen in subalpine Castle Lake, California

J. P. Zehr, S. G. Paulsen, R. P. Axler, C. R. Goldman

Research output: Contribution to journalArticlepeer-review

16 Scopus citations


Dissolved organic nitrogen (DON) concentrations were measured in meso-oligotrophic Castle Lake, California during the ice-free season in 1982, 1983 and 1984. No consistent relationships were found between DON and particulate-N, primary productivity rates or chlorophyll concentrations. However, increases in DON concentrations were observed in the early growing season of 1982 and 1984 when water temperature was rising and a diatom bloom was senescing. DON increased at a high rate (0.31 mg atom N m-3 day-1), and then rapidly disappeared. Sediment released appared to be the most important source of DON. Dissolved free amino acids were always less than 7.5% of the DON pool, and did not vary in the composition of specific amino acids during the growing season.

Original languageEnglish (US)
Pages (from-to)33-45
Number of pages13
Issue number1
StatePublished - Jan 1988


  • dissolved organic matter
  • nitrogen cycling
  • subalpine lake


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