Ammonium regeneration by microzooplankton in the Oslofjord
Paasche, E. ; Kristiansen, S. (1982). Ammonium regeneration by microzooplankton in the Oslofjord. Mar. Biol. (Berl.) 69(1): 55-63
In: Marine Biology: International Journal on Life in Oceans and Coastal Waters. Springer: Heidelberg; Berlin. ISSN 0025-3162; e-ISSN 1432-1793, more
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| Keywords |
Algal blooms
Aquatic communities > Plankton > Zooplankton
Characteristics > Productivity
Chemical compounds > Nitrogen compounds > Ammonia
Flora
Fungi
Layers > Discontinuity layers > Pycnocline
Microorganisms > Bacteria
Microorganisms > Viruses
Production rate > Productivity
Productivity
Protists
ANE, Norway, Oslofjord [Marine Regions]
Marine/Coastal |
| Authors | | Top |
- Paasche, E.
- Kristiansen, S.
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| Abstract |
Concentrations of dissolved inorganic nitrogen compounds above the pycnocline in the Oslofjord are very low in the summer, with turnover times of the inorganic N pools of no more than a few hours. To investigate the possibility that continued phytoplantkon growth in the summer depends on ammonium excretion by microzooplankton, rates of NH+4 regeneration and assimilation were measured by a 15N isotope dilution method. Daytime regeneration rates at 0-2 m depth were 0-28% of the calculated assimilation rates at ambient NH+4 concentrations. Regeneration was faster during a dinoflagellate bloom in August than in mixed diatom-dinoflagellate blooms in June and September. |
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