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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. Springer: Heidelberg; Berlin. ISSN 0025-3162, more
Peer reviewed article  

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Keywords
    Algal blooms; Ammonia; Bacteria; Flora; Fungi; Productivity; Productivity; Productivity; Protists; Pycnocline; Viruses; Zooplankton; ANE, Norway, Oslofjord [Marine Regions]; Marine

Authors  Top 
  • Paasche, E.
  • Kristiansen, S.

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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