nieuwe zoekopdracht
[ meld een fout in dit record ]mandje (0): toevoegen | toon Print deze pagina

Comparing diatom and Alexandrium catenella/tamarense blooms in Thau lagoon: Importance of dissolved organic nitrogen in seasonally N-limited systems
Collos, Y.; Jauzein, C.; Ratmaya, W.; Souchu, P.; Abadie, E.; Vaquer, A. (2014). Comparing diatom and Alexandrium catenella/tamarense blooms in Thau lagoon: Importance of dissolved organic nitrogen in seasonally N-limited systems. Harmful Algae 37: 84-91. hdl.handle.net/10.1016/j.hal.2014.05.008
In: Harmful Algae. Elsevier: Tokyo; Oxford; New York; London; Amsterdam; Shannon; Paris. ISSN 1568-9883; e-ISSN 1878-1470, meer
Peer reviewed article  

Beschikbaar in  Auteurs | Dataset 

Trefwoorden
    Ammonium
    Chemical elements > Nonmetals > Atmospheric gases > Nitrogen > Organic nitrogen
    Growth rate
    Alexandrium catenella (Whedon & Kofoid) Balech, 1985 [WoRMS]; Alexandrium tamarense (Lebour) Balech, 1995 [WoRMS]
    Marien
Author keywords
    Alexandrium catenella/tamarense; Non classical blooms

Auteurs  Top | Dataset 
  • Collos, Y.
  • Jauzein, C.
  • Ratmaya, W.
  • Souchu, P.
  • Abadie, E.
  • Vaquer, A.

Abstract
    Diatom blooms in Thau lagoon are always related to rain events leading to inputs of inorganic nutrients such as phosphate, ammonium and nitrate through the watershed with time lags of about 1 week. In contrast, blooms of Alexandrium catenella/tamarense can occur following periods of 3 weeks without precipitation and no significant input of conventional nutrients such as nitrate and phosphate. Field results also indicate a significant drop (from 22–25 to 15–16 µM over 3 days) in dissolved organic nitrogen (DON) at the bloom peak, as well as a significant inverse relationship between A. catenella/tamarense cell density and DON concentrations that is not apparent for diatom blooms. Such dinoflagellate blooms are also associated with elevated (6–9 µM) ammonium concentrations, a curious feature also observed by other investigators, possibly the results of ammonium excretion by this organism during urea or other organic nitrogen assimilation.

    The potential use of DON by this organism represents short cuts in the nitrogen cycle between plants and nutrients and requires a new model for phytoplankton growth that is different from the classical diatom bloom model. In contrast to such diatom blooms that are due to conventional (nitrate, phosphate) nutrient pulses, Alexandrium catenella/tamarense blooms on the monthly time scale are due to organic nutrient enrichment, a feature that allows net growth rates of about 1.3 d−1, a value higher than that generally attributed to such organisms.


Dataset
  • REPHY: Network Monitoring phytoplankton

Alle informatie in het Integrated Marine Information System (IMIS) valt onder het VLIZ Privacy beleid Top | Auteurs | Dataset 
IMIS is ontwikkeld en wordt gehost door het VLIZ, voor meer informatie contacteer .