CS26 Organic Carbon Dynamics
Date: Thursday, June 13, 2002
Time: 12:00:00 PM
Location: Carson C
 
RomaníA, University of Girona, Girona, Spain, anna.romani@udg.es
Vilalta, E, , University of Barcelona, Barcelona, Spain, vilalta@porthos.bio.ub.es
Guasch, H, , University of Barcelona, Barcelona, Spain, hguasch@porthos.bio.ub.es
Muñoz, I, , University of Barcelona, Barcelona, Spain, munoz@porthos.bio.ub.es
Navarro, E, , University of Barcelona, Barcelona, Spain, enavarro@porthos.bio.ub.es
Ruana, J, , Consorci d'Aigües de Tarragona, Tarragona, Spain, jfruana@readysoft.es
Sabater, S, , University of Girona, Girona, Spain, sergi.sabater@udg.es
 
CAPACITY OF DOC CONSUMPTION AND PRODUCTION BY NATURAL BIOFILMS
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A field study was planned in order to elucidate the role of algae, bacteria and other heterotrophs (protozoa, sponges) on the dynamics of DOC (dissolved organic carbon) and BDOC (biodegradable DOC). Changes in total DOC, BDOC, autotrophic and heterotrophic structure (biomass and species composition of bacteria, algae and invertebrates) and function (photosynthesis and extracellular enzyme activities) of biofilms were studied over an annual cycle at three different compartments of the river Ebre: the main river, an open irrigation channel and a completely dark pipe. The DOC budget along the different compartments was calculated. Our results indicate that heterotrophic biofilms play an important role on the retention of BDOC under dark conditions while autotrophic biofilms are both producers and consumers of BDOC. The biofilm capacity of DOC consumption and production along the channel and the pipe have been also calculated and evaluated by a laboratory approach.