Record Details
Carbon limitation of ammonium uptake by heterotrophic bacteria in the subarctic Pacific
ScholarsArchive at Oregon State University
| Field | Value |
|---|---|
| Title | Carbon limitation of ammonium uptake by heterotrophic bacteria in the subarctic Pacific |
| Names |
Kirchman, David L.
(creator) Keil, Richard G. (creator) Wheeler, Patricia A. (creator) |
| Date Issued | 1990 (iso8601) |
| Abstract | 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. |
| Genre | Article |
| Identifier | Limnol. Oceanogr., 35(6), 1990, 1258–1266 |
