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MCM

Organics From Microbes

Long-term studies by MCM scientists in the cold, hostile and plant-free environment of Antarctica reveal that substantial amounts of dissolved organic material in lakes and streams originate from algae and bacteria, demonstrating their role in the cycling of this important form of carbon in aquatic ecosystems worldwide.

McKnight, D.M., E.W. Boyer, P.K. Westerhoff, P.T. Doran, T. Kulbe, and D.T. Andersen (2001). Spectrofluorometric characterization of dissolved organic matter for indication of precursor organic material and aromaticity. Limnology and Oceanography, v. 46, p. 38-48.
Miller, M. P., D. M. McKnight, S. C. Chapra and M.W. Williams. 2009. A model of degradation and production of three pools of dissolved organic matter in an alpine lake. Limnol.Oceanogr.54:2213-2227.
Monteith et al.. 2007. Dissolved organic carbon trends resulting from changes in atmospheric deposition chemistry. Nature 450: 537-540.
Fig 1. Lake Chad and the Seuss Glacier in Taylor Valley in the McMurdo Dry Valleys, South Victorialand, Antarctica.
Rebecca Witherow, www.mcmlter.org
The carbon to nitrogen ratio in DOM and the fluorescence index (FI) for all samples from the 13 LTER and other field sites from across the United States. DOM samples with a higher FI have a greater contribution from algae and bacteria, i.e. are more similar to Antarctic lake DOM and are richer nitrogen compared to carbon (lower C:N ratio). The asterisk indicates significant at the 95% confidence level.
Jaffe R, McKnight D, Maie N, Cory, R., McDowell, W. H., Campbell, J. L. 2008. Spatial and temporal variations in DOM composition in ecosystems: The importance of long-term monitoring of optical properties. Journal of Geophysical Research-Biogeosciences113G4G04032 .

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