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Evidence for non-selective preservation of organic matter in sinking marine particles

Nature volume 409, pages 801–804 (2001)Cite this article

Abstract

The sinking of particulate organic matter from ocean surface waters transports carbon to the ocean interior1,2, where almost all is then recycled. The unrecycled fraction of this organic matter can become buried in ocean sediments, thus sequestering carbon and so influencing atmospheric carbon dioxide concentrations3. The processes controlling the extensive biodegradation of sinking particles remain unclear, partly because of the difficulty in resolving the composition of the residual organic matter at depth with existing chromatographic techniques4. Here, using solid-state 13C NMR spectroscopy5, we characterize the chemical structure of organic carbon in both surface plankton and sinking particulate matter from the Pacific Ocean4 and the Arabian Sea6. We found that minimal changes occur in bulk organic composition, despite extensive (>98%) biodegradation, and that amino-acid-like material predominates throughout the water column in both regions. The compositional similarity between phytoplankton biomass and the small remnant of organic matter reaching the ocean interior indicates that the formation of unusual biochemicals, either by chemical recombination7 or microbial biosynthesis8, is not the main process controlling the preservation of particulate organic carbon within the water column at these two sites. We suggest instead that organic matter might be protected from degradation by the inorganic matrix of sinking particles.

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Figure 1: Solid-state 13C NMR spectra of material from the equatorial Pacific Ocean and the Arabian Sea.
Figure 2: Calculated weight percentages of biochemicals in the samples from the equatorial Pacific Ocean and the Arabian Sea.

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Acknowledgements

We thank P. Hernes, B. Bergamaschi, J. Murray, J. Dymond and the captain and crew of the RV Thomas G. Thompson for support during the cruises; S. Honjo and J. Dymond (and field groups) for accommodating our sediment traps on their moorings; and A. Aufdenkampe, R. Benner and B. van Mooy for comments that significantly improved the manuscript. This work was supported by the NSF (J.H., C.L. and S.W.); Y.G. thanks the Canadian Natural Sciences and Engineering Research Council (NSERC) for a post-doctoral fellowship.

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Authors and Affiliations

  1. School of Oceanography, Box 357940, University of Washington, Seattle, 98195-7940, Washington, USA

    John I. Hedges, Yves Gélinas & Michael Peterson

  2. CSIRO Land and Water, PMB #2, Glen Osmond, 5064, South Australia, Australia

    Jeffrey A. Baldock

  3. Marine Sciences Research Center, State University of New York, Stony Brook, 11794, New York, USA

    Cindy Lee

  4. Skidaway Institute of Oceanography, 10 Ocean Science Circle, Savannah, 31411, Georgia, USA

    Stuart G. Wakeham

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  1. John I. Hedges
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  4. Cindy Lee
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  6. Stuart G. Wakeham
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Correspondence to John I. Hedges.

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Hedges, J., Baldock, J., Gélinas, Y. et al. Evidence for non-selective preservation of organic matter in sinking marine particles. Nature 409, 801–804 (2001). https://doi.org/10.1038/35057247

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