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MEPS 215:49-56 (2001)
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Abstract
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Primary production in estuarine oxic/anoxic interfaces: contribution of microbial dark CO2 fixation in the Ebro River Salt Wedge Estuary
Emilio O. Casamayor1,*, Josefina García-Cantizano2, Jordi Mas2, Carlos Pedrós-Alió1
1Departament de Biologia Marina i Oceanografia. Institut de Ciències del Mar-CSIC, Passeig Joan de Borbó s/n, 08039 Barcelona, Spain
2Departament de Genètica i de Microbiologia, Universitat Autònoma de Barcelona, 08193 Bellaterra (Barcelona), Spain
*E-mail: casamayor@icm.csic.es
ABSTRACT: The present study assesses the contribution of dark carbon fixation to the primary production in the oxic/anoxic interface of a shallow estuarine environment that develops a salt-water wedge with the presence of sulfide. Primary production was
partitioned into oxygenic photosynthesis, anoxygenic photosynthesis and dark fixation. The results show the importance of dark fixation in the oxic/anoxic interface with values higher than 5 mg carbon fixed per cubic meter and per hour in some cases. The
average rate of primary production in the dark during the anoxic season for the Ebro River salt wedge resulted in 42 mg C m-2 d-1 in the interface. This represents at least twice the contribution of oxygenic photosynthesis to the
primary production in such interface. Because this process is probably important in other salt-wedge or highly stratified estuaries with oxic/anoxic interfaces containing sulfide, the estimates of carbon fixation made so far for these systems may have
been underestimated, and should therefore be revised taking into account the contribution of dark processes.
KEY WORDS: Primary production · Dark fixation · Thiobacilli · Salt wedge · Estuary · Sulfide · Oxic/anoxic interface
Full text in pdf format
Published in MEPS Vol.
215
(2001) on May 31
Print ISSN: 0171-8630; Online ISSN: 1616-1599.
Copyright © Inter-Research, Oldendorf/Luhe, 2001
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