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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

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Beschikbaar in	Auteurs
VLIZ: Open Marine Archive 69667 [ download pdf ]

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Trefwoorden

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] Marien/Kust

Author keywords

CDOM; DOC; mesocosms; viruses; cyanobacteria; heterotrophic; bacteria; CO2<; sub>

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Auteurs		Top
Rochelle-Newall, E. Delille, B. Frankignoulle, M. Gattuso, J.P.	Jacquet, S. Riebesell, U. Terbruggen, A. Zondervan, I.

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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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