Annual benthic organic carbon production in a semi-enclosed Mediterranean bay dominated by Caulerpa prolifera

Show simple item record Ruíz-Halpern, Sergio Vaquer-Sunyer, Raquel Duarte Quesada, Carlos M. 2015-09-21T12:41:08Z 2015-09-21T12:41:08Z 2014-12-08
dc.identifier.citation 2296-7745
dc.description.abstract Coastal areas play an important role on carbon cycling. Elucidating the dynamics on the production, transport, and fate of organic carbon (OC) is relevant to gain a better understanding on the role coastal areas play in the global carbon budget. Here, we assess the metabolic status and associated OC fluxes of a semi-enclosed Mediterranean bay supporting a meadow of Caulerpa prolifera. We test whether the EDOC pool is a significant component of the OC pool and associated fluxes in this ecosystem. The Bay of Portocolom was in net metabolic balance on a yearly basis, but heterotrophic during the summer months. Community respiration (CR) was positively correlated to C. prolifera biomass, while net community production (NCP) had a negative correlation. The benthic compartment represented, on average, 72.6 ± 5.2% of CR and 86.8 ± 4.5% of gross primary production (GPP). Dissolved organic carbon (DOC) production peaked in summer and was always positive, with the incubations performed in the dark almost doubling the flux of those performed in the light. Exchangeable dissolved organic carbon (EDOC), however, oscillated between production and uptake, being completely recycled within the system and representing around 14% of the DOC flux. The pools of bottom and surface DOC were high for an oligotrophic environment, and were positively correlated to the pool of EDOC. Thus, despite being in metabolic balance, this ecosystem acted as a conduit for OC, as it is able to export OC to adjacent areas derived from allochtonous inputs during heterotrophic conditions. These inputs likely come from groundwater discharge, human activity in the watershed, delivered to the sediments through the high capacity of C. prolifera to remove particles from the water column, and from the air-water exchange of EDOC, demonstrating that these communities are a major contributor to the cycling of OC in coastal embayments.
dc.language.iso eng
dc.publisher Frontiers
dc.relation.isformatof Reproducció del document publicat a: 10.3389/fmars.2014.00067
dc.relation.ispartof Frontiers in Marine Science, 2014, vol. 1
dc.rights cc-by (c) Ruíz-Halpern,Sergio et al., 2014
dc.title Annual benthic organic carbon production in a semi-enclosed Mediterranean bay dominated by Caulerpa prolifera
dc.type info:eu-repo/semantics/article
dc.type info:eu-repo/semantics/publishedVersion 2015-09-21T12:41:08Z
dc.subject.keywords dissolved organic Carbon (DOC)
dc.subject.keywords exchangeable dissolved organic Carbon (EDOC)
dc.subject.keywords volatile organic carbon (VOC)
dc.subject.keywords metabolism
dc.subject.keywords Macroalgae
dc.rights.accessRights info:eu-repo/semantics/openAccess

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