Vlaams Instituut voor de Zee

Platform voor marien onderzoek

In:

Open Marien Archief

Het Open Marien Archief van België (OMA) biedt vrije toegang tot de digitale publicaties over de Vlaamse kust en het Belgisch deel van de Noordzee, en alle andere mariene, estuariene en kustgebonden publicaties van Belgische auteurs en wetenschappers en van buitenlandse wetenschappers geaffilieerd aan een Belgische instelling.

Meer info

Nieuwe zoekopdracht
meld een fout in dit recordmandje (0): toevoegen | toon Print-vriendelijke versie

Carbon and nitrogen cycling on intertidal mudflats of a temperate Australian estuary: 4. Inverse model analysis and synthesis
Cook, P.L.M.; van Oevelen, D.; Soetaert, K.; Middelburg, J.J. (2009). Carbon and nitrogen cycling on intertidal mudflats of a temperate Australian estuary: 4. Inverse model analysis and synthesis. Mar. Ecol. Prog. Ser. 394: 35-48. dx.doi.org/10.3354/meps08270
In: Marine Ecology Progress Series. Inter-Research: Oldendorf. ISSN 0171-8630, meer
Peer reviewed article

Beschikbaar in Auteurs 

Trefwoorden
    Fytobenthos; Koolstofcyclus; Nitrogen fixation; Organisch materiaal; Sedimenten; Stikstofcyclus; Stoichiometry; Wadden; Slikken; PSE, Australia, Tasmania; Marien; Brak water

Auteurs  Top 
  • Cook, P.L.M.
  • van Oevelen, D., meer
  • Soetaert, K., meer
  • Middelburg, J.J., meer

Abstract
    Microphytobenthos (MPB) are recognised as exerting an important controlling influence over C and N flows in euphotic sediments; however, the coupling between these flows remains poorly studied. We undertook an inverse model analysis of C and N fluxes through the microbial compartment on intertidal flats in a temperate estuary. The analysis showed that the trophic balance of the sediment exerted a strong influence on the relative fluxes of C and N through the sediment microbial community. Under increasingly autotrophic conditions (production:respiration >1), the assimilation of C relative to N rose above the cellular C:N ratio of MPB, resulting in increased excretion rates of organic matter by MPB. The C:N ratio of the organic matter excreted was also highly variable, ranging from ~20 (mol:mol) under heterotrophic conditions, and increasing to >50 under autotrophic conditions. The relative fluxes of C and N through bacteria were also significantly affected by the trophic balance of the sediment and the ratio of C:N mineralized by bacteria was significantly higher under autotrophic conditions. Dissolved organic N release by bacteria and uptake by MPB also predominated over inorganic N forms under autotrophic conditions. We conclude that C and N fluxes through shallow euphotic sediments may become significantly decoupled and well above the commonly assumed Redfield ratio and measured cellular C:N ratios of MPB.

 Top | Auteurs