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dc.contributor.authorDale, Andrew W.-
dc.contributor.authorPrego, R.-
dc.date.accessioned2010-07-07T09:10:18Z-
dc.date.available2010-07-07T09:10:18Z-
dc.date.issued2002-06-
dc.identifier.citationMarine Ecology Progress Series 235: 15-28 (2002)en_US
dc.identifier.issn0171-8630-
dc.identifier.urihttp://hdl.handle.net/10261/26057-
dc.description14 pages, 13 figures, 1 table.en_US
dc.description.abstractSediment incubation microcosms, multitrap apparatus and water column variables have been employed to describe the dynamic changes in benthic-pelagic coupling between nutrient pools in the Pontevedra ria, NW Spain, during spring and summer 1998. A comparison of the chemical characteristics of suspended and bed sediment together with sediment nutrient effluxes revealed that particulate organic nitrogen and carbon were progressively depleted upon transit through the nutrient pools. The main fate of particulate organic nitrogen reaching the bed sediment is denitrification, although resuspension is also important. An estimate of net denitrification (Dnet) was made at 2 muddy sites in the ria with a mass balance at the benthic boundary layer. First-order approximations calculate Dnet to be 178 and 182 µmolN m-2 h-1 at the 2 stations, and agree well with previous modelling estimates. Denitrification is highest when upwelling relaxes and the flux of organic matter to the sediment increases. Regular inputs of offshore water ensure water renewal and re-oxygenation of bottom waters, thus preventing anoxia, particularly in the summer. With upwelling, large quantities of ammonium are effluxed to the water column (250 µmolNH4+ m-2 h-1), probably as a result of the bed sediment resuspension engendered by upwelling and stirring of phytodetrital fluff held in suspension as neutrally buoyant material above the sediment surface. We hypothesise that hydrodynamical processes play an important role in determining the quantity of nutrients remineralised in the Pontevedra ria and, in the case of nitrogen, the rate of denitrification at the benthic boundary layer.en_US
dc.description.sponsorshipThis work was supported by CICYT under the project ‘The hydrodynamics and biogeochemical cycle of silicon in the Pontevedra ria’, ref. MAR96- 1782. A.W.D. was supported by a research grant jointly funded by CSIC (Spain) and the University of Plymouth (UK).en_US
dc.format.extent1012258 bytes-
dc.format.mimetypeapplication/pdf-
dc.language.isoengen_US
dc.publisherInter Researchen_US
dc.rightsopenAccessen_US
dc.subjectUpwellingen_US
dc.subjectDenitrificationen_US
dc.subjectNitrogenen_US
dc.subjectSedimenten_US
dc.subjectHydrodynamicsen_US
dc.subjectBenthic-pelagic couplingen_US
dc.subjectPontevedra riaen_US
dc.subjectGaliciaen_US
dc.titlePhysico-biogeochemical controls on benthic pelagic coupling of nutrient fluxes and recycling in a coastal upwelling systemen_US
dc.typeartículoen_US
dc.identifier.doi10.3354/meps235015-
dc.description.peerreviewedPeer revieweden_US
dc.relation.publisherversionhttp://dx.doi.org/10.3354/meps235015en_US
dc.type.coarhttp://purl.org/coar/resource_type/c_6501es_ES
item.openairetypeartículo-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextopen-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
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