IMIS | Flanders Marine Institute

Flanders Marine Institute

Platform for marine research


Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Printer-friendly version

Response of coastal phytoplankton to ammonium and nitrate pulses: seasonal variations of nitrogen uptake and regeneration
Collos, Y.; Vaquer, A.; Bibent, B.; Souchu, P.; Slawyk, G.; Garcia, N. (2003). Response of coastal phytoplankton to ammonium and nitrate pulses: seasonal variations of nitrogen uptake and regeneration. Aquat. Ecol. 37(3): 227-236.
In: Aquatic Ecology. Springer: Dordrecht; London; Boston. ISSN 1386-2588, more
Peer reviewed article  

Available in  Authors 

    Ammonium compounds; Coastal lagoons; Nitrates; Nitrification; Particulate organic matter; Particulate organic nitrogen; Phytoplankton; Regeneration; Seasonal variations; Uptake; MED, France, Languedoc-Roussillon, Thau Lagoon [Marine Regions]; Marine
Author keywords
    ammonium; coastal lagoon; nitrate; nitrification; pulses; uptake

Authors  Top 
  • Collos, Y.
  • Vaquer, A.
  • Bibent, B.
  • Souchu, P.
  • Slawyk, G.
  • Garcia, N.

    Seasonal variation in uptake and regeneration of ammonium and nitrate in a coastal lagoon was studied using 15N incorporation in particulate matter and by measuring changes in particulate nitrogen. Uptake and regeneration rates were two orders of magnitude lower in winter than in summer. Summer uptake values were 2.8 and 2.2 μmol N.l-1.d-1 for ammonium and nitrate, respectively. Regeneration rates were 2.9 and 2.1 μmol N.lsup>-1.d-1 for ammonium and nitrate respectively. Regeneration/uptake ratios were often below one, indicating that water column processes were not sufficient to satisfy the phytoplankton nitrogen demand. This implies a role of other sources of nitrogen, such as macrofauna (oysters and epibionts) and sediment. Phytoplankton was well adapted to the seasonal variations in resources, with mixotrophic dinoflagellates dominant in winter, and fast growing diatoms in summer. In winter and spring, ammonium was clearly preferred to nitrate as a nitrogen source, but nitrate was an important nitrogen source in summer because of high nitrification rates. Despite low nutrient levels, the high rates of nitrogen regeneration in summer as well as the simultaneous uptake of nitrate and ammonium allow high phytoplankton growth rates which in turn enable high oyster production.

All data in IMIS is subject to the VLIZ privacy policy Top | Authors