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Chromophoric dissolved organic matter in experimental mesocosms maintained under different pCO2 levels
Rochelle-Newall, E.; Delille, B.; Frankignoulle, M.; Gattuso, J.P.; Jacquet, S.; Riebesell, U.; Terbruggen, A.; Zondervan, I. (2004). Chromophoric dissolved organic matter in experimental mesocosms maintained under different pCO2 levels. Mar. Ecol. Prog. Ser. 272: 25-31. dx.doi.org/10.3354/meps272025
In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630; e-ISSN 1616-1599, more
Peer reviewed article  
Available in  Authors 
Keywords
    Aquatic organisms > Heterotrophic organisms
    Chemical compounds > Carbon compounds > Atmospheric gases > Carbon dioxide
    Mesocosms
    Microorganisms > Viruses
    Organic matter > Carbon > Organic carbon > Dissolved organic matter > Dissolved organic carbon
    Bacteria [WoRMS]; Cyanobacteria [WoRMS]; Viruses [WoRMS]
    Marine/Coastal
Author keywords
    CDOM; DOC; mesocosms; viruses; cyanobacteria; heterotrophic; bacteria; CO2<; sub>
Authors  Top 
  • Rochelle-Newall, E.
  • Delille, B., more
  • Frankignoulle, M., more
  • Gattuso, J.P., more
  • Jacquet, S.
  • Riebesell, U.
  • Terbruggen, A.
  • Zondervan, I., more
Abstract
    Chromophoric dissolved organic matter (CDOM) represents the optically active fraction of the bulk dissolved organic matter (DOM) pool. Recent evidence pointed towards a microbial source of CDOM in the aquatic environment and led to the proposal that phytoplankton is not a direct source of CDOM, but that heterotrophic bacteria, through reprocessing of DOM of algal origin, are an important source of CDOM. In a recent experiment designed at looking at the effects of elevated pCO2 on blooms of the coccolithophorid alga Emiliania huxleyi, we found that despite the 3 different pCO2 levels tested (190, 414 and 714 ppm), no differences were observed in accumulation of CDOM over the 20 d of incubation. Unlike previous mesocosm experiments where relationships between CDOM accumulation and bacterial abundance have been observed, none was observed here. These results provide some new insights into the apparent lack of effect of pCO2 on CDOM accumulation in surface waters, and question the previously proposed mechanisms and rates of CDOM production in natural phytoplankton blooms.
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