Refractory dissolved organic nitrogen accumulation in high-elevation lakes

S.J. Goldberg (), G.I. Ball, B.C. Allen, S.G. Schladow, A.J. Simpson, H. Masoom, R. Soong, H.D. Graven and L.I. Aluwihare
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S.J. Goldberg: Scripps Institution of Oceanography
G.I. Ball: Scripps Institution of Oceanography
B.C. Allen: Tahoe Environmental Research Center, University of California, Davis
S.G. Schladow: Tahoe Environmental Research Center, University of California, Davis
A.J. Simpson: Environmental NMR Center and Chemistry Program, University of Toronto at Scarborough
H. Masoom: Environmental NMR Center and Chemistry Program, University of Toronto at Scarborough
R. Soong: Environmental NMR Center and Chemistry Program, University of Toronto at Scarborough
H.D. Graven: Imperial College London, South Kensington Campus
L.I. Aluwihare: Scripps Institution of Oceanography

Nature Communications, 2015, vol. 6, issue 1, 1-9

Abstract: Abstract The role of dissolved organic matter (DOM) as either a sink for inorganic nutrients or an additional nutrient source is an often-neglected component of nutrient budgets in aquatic environments. Here, we examined the role of DOM in reactive nitrogen (N) storage in Sierra Nevada (California, USA) lakes where atmospheric deposition of N has shifted the lakes toward seasonal phosphorus (P)-limitation. Nuclear magnetic resonance (NMR) spectroscopy and isotope analyses performed on DOM isolated from Lake Tahoe reveal the accumulation of refractory proteinaceous material with a 100–200-year residence time. In contrast, smaller lakes in the same watershed contain DOM with typical terrestrial characteristics, indicating that proteins in Lake Tahoe are autochthonously produced. These data support the role of DOM as a possible sink for reactive N in these lake ecosystems and identify a potential role for DOM in affecting the inorganic nutrient stoichiometry of these environments.

Date: 2015
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DOI: 10.1038/ncomms7347

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