Carbon limitation of ammonium uptake by heterotrophic bacteria in the subarctic Pacific Public Deposited

http://ir.library.oregonstate.edu/concern/defaults/08612q175

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  • The purpose of this study was to test the hypothesis that NH4+ uptake by heterotrophic bacteria in the subarctic Pacific is C limited. Addition of glucose (0.5–1.0 μM) stimulated NH4+ uptake in unfractionated water but had no effect on bacterial abundance. Glucose stimulation of NH4+ uptake was even greater in the bacterial size fraction (<0.8 μm). Regeneration of 15NH4+ from added [15N] amino acids was measurable in the bacterial size fraction, but glucose additions prevented net NH4+ excretion because of increased uptake of NH4+. In the subarctic Pacific, NH4+ concentrations range from undetectable (≤0.05 μM) to 0.4 μM, whereas the maximal estimate of monosaccharide concentrations was 0.025 μM. These results indicate that the supply of C compounds like glucose can limit NH4+ uptake by heterotrophic bacteria.
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  • Limnol. Oceanogr., 35(6), 1990, 1258–1266
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  • Methods and materials; Results; Discussion
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  • description.provenance : Submitted by Linda Lamb (llamb@coas.oregonstate.edu) on 2009-10-05T16:19:00Z No. of bitstreams: 1 Kirchman et al. 1990.pdf: 821665 bytes, checksum: 6456cdacd686e9b63e2a6af7bf9df658 (MD5)
  • description.provenance : Approved for entry into archive by Linda Lamb(llamb@coas.oregonstate.edu) on 2009-10-05T16:24:20Z (GMT) No. of bitstreams: 1 Kirchman et al. 1990.pdf: 821665 bytes, checksum: 6456cdacd686e9b63e2a6af7bf9df658 (MD5)
  • description.provenance : Made available in DSpace on 2009-10-05T16:24:20Z (GMT). No. of bitstreams: 1 Kirchman et al. 1990.pdf: 821665 bytes, checksum: 6456cdacd686e9b63e2a6af7bf9df658 (MD5) Previous issue date: 1990
ISSN
  • 0024-3590

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