Abstract
Rates of ammonium remineralization were determined using a 15N isotope dilution technique for two oceanic regions, one coastal region, and one estuarine region, covering a wide range of ambient nutrient, light, and temperature conditions. Results showed that NH +4 assimilative and regenerative fluxes were primarily in balance, even when the ambient nitrogenous pool was completely dominated by NO -3 . Variations in uptake and remineralization rates relative to time of day and season were also determined. Size fraction studies at several of the sites showed that the smallest size fraction (<10 μm) was usually the most important in remineralizing NH +4 , and the importance of the apparent bacterial fraction (<1 μm) may increase following blooms. The results support the concept that, over a wide variety of conditions, the fluxes of NH +4 remineralization and uptake are tightly coupled; phytoplankton are able to utilize NH +4 at the rate that it is produced by heterotrophic processes.
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Communicated by S.K. Pierce, College Park
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Glibert, P.M. Regional studies of daily, seasonal and size fraction variability in ammonium remineralization. Mar. Biol. 70, 209–222 (1982). https://doi.org/10.1007/BF00397687
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DOI: https://doi.org/10.1007/BF00397687