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Utilization of inorganic and organic nitrogen by bacteria in marine systems Public Deposited

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  • The relative contribution of various inorganic and organic forms of nitrogen to the nitrogen requirements of picoplankton was examined with 15N tracers. Size fractionation was used to measure uptake by <1-μM size microorganisms, and inhibitors of protein synthesis were used to separate procaryotic from eucaryotic nitrogen uptake, Picoplankton utilized mainly ammonium and amino acids and only negligible amounts of nitrate and urea. Nearly all amino acid uptake was by procaryotes, while both procaryotes and eucaryotes utilized ammonium. About 78% of total ammonium uptake was by procaryotes, and a significant portion of this was due specifically to heterotrophic bacteria. Regeneration of ammonium was correlated with eucaryotic rather than procaryotic activity. Ammonium accounted for at least 20–60% of the summed ammonium plus amino acid utilization by bacteria. The results suggest that a significant portion of ammonium uptake in the euphotic zone was by heterotrophic bacteria rather than solely by phytoplankton. This may invalidate the use of the Redfield C:N ratio for estimating rates of nitrogen assimilation in the euphotic zone from carbon assimilation rates.
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  • Wheeler, Patricia A., Kirchman, David L., ( 1986), Utilization of inorganic and organic nitrogen by bacteria in marine systems, Limnology and Oceanography, 5, doi: 10.4319/lo.1986.31.5.0998.
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  • 31
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  • 5
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  • Methods; Results; Discussion
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  • Professorships for Women Program (grant RTI-83 10369) and by NSF grants OCE 83-08753 (to P. A. Wheeler) and OCE 8 1-17834 (to R. E. Hodson).
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  • description.provenance : Approved for entry into archive by Linda Lamb(llamb@coas.oregonstate.edu) on 2009-10-05T15:11:03Z (GMT) No. of bitstreams: 1 Wheeler&Kirchman 1986.pdf: 1492901 bytes, checksum: 33efc5498d7f2d8e20a7ebadcd03db73 (MD5)
  • description.provenance : Made available in DSpace on 2009-10-05T15:11:03Z (GMT). No. of bitstreams: 1 Wheeler&Kirchman 1986.pdf: 1492901 bytes, checksum: 33efc5498d7f2d8e20a7ebadcd03db73 (MD5) Previous issue date: 1986
  • description.provenance : Submitted by Linda Lamb (llamb@coas.oregonstate.edu) on 2009-10-04T20:26:12Z No. of bitstreams: 1 Wheeler&Kirchman 1986.pdf: 1492901 bytes, checksum: 33efc5498d7f2d8e20a7ebadcd03db73 (MD5)
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  • 0024-3590

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