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Pelagic metabolism of the Douro estuary (Portugal) - Factors controlling primary production

2006Journal article Open access
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dc.contributor.authorAzevedo, Isabel C.por
dc.contributor.authorDuarte, Pedro
dc.contributor.authorBordalo, Adriano
dc.date.accessioned2007-09-24T12:50:59Zpor
dc.date.accessioned2011-10-06T14:40:34Z
dc.date.available2007-09-24T12:50:59Zpor
dc.date.available2011-10-06T14:40:34Z
dc.date.issued2006por
dc.description.abstractThe pelagic metabolism of the Douro estuary (Portugal) and the factors influencing primary production (PP) and community respiration (CR) in this system were studied during an annual cycle (December 2002 - December 2003). Sampling surveys were conducted twice a month during ebb and flood spring tides and water samples were collected for PP and CR assessments at three stations along the estuary (lower, middle and upper stretches). During the study period, PP values were in the range of 4.7-1878.5 mg C m-2 d-1 (average, 319.9 mg C m-2 d-1). River discharge controlled phytoplankton biomass inputs into the estuary as well as residence time. A decreasing trend in water column PP from the upper to the lower estuary related to higher nitrogen concentrations and phytoplankton biomass from riverine origin was observed. An inverse trend was found for CR, i.e., higher values were found in the lower, more urbanized stretch. During the study period, averaged CR values reached 1154 mg C m-2 d-1. In general, heterotrophy dominated the entire estuary, except in the upper stretch from May through July, when increased PP, but also lower CR values were recorded. A positive correlation between chlorophyll a and Pmax was found which is unusual in coastal ecosystems, where a decreasing trend of the P/B ratio as a function of net primary production is generally observed. This could be explained by the relatively low phytoplankton biomass, preventing intraspecific competition from lowering photosynthetic capacity, on one hand, and the physiology of phytoplankton related to their origin in a semi-lotic (reservoir) ecosystem. No significant differences between tides were observed for all variables, except for the water light extinction coefficient (k) values, reflecting higher turbidity during the ebb.por
dc.identifier.citationEstuarine, Coastal and Shelf Science. 69 (2006), p. 133-146.por
dc.identifier.urihttp://hdl.handle.net/10284/292por
dc.language.isoengpor
dc.publisherElsevierpor
dc.relation.ispartofseriesEstuarine, Coastal and Shelf Sciencepor
dc.relation.ispartofseries69por
dc.subjectPrimary productionpor
dc.subjectPelagic metabolismpor
dc.subjectRespirationpor
dc.subjectPhytoplanktonpor
dc.subjectPhotosynthetic parameterspor
dc.subjectDouro estuarypor
dc.titlePelagic metabolism of the Douro estuary (Portugal) - Factors controlling primary productionpor
dc.typejournal article
dspace.entity.typePublication
person.familyNameDuarte
person.familyNameA. Bordalo
person.givenNamePedro
person.givenNameAdriano
person.identifier158912
person.identifier.ciencia-idF614-0053-05A5
person.identifier.ciencia-id8B15-A841-2083
person.identifier.orcid0000-0001-7461-605X
person.identifier.orcid0000-0002-9637-6541
person.identifier.ridF-1247-2014
person.identifier.scopus-author-id7005201821
person.identifier.scopus-author-id7004738492
rcaap.rightsopenAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationde486bab-75c6-4f98-8ee1-b27b20edbe2d
relation.isAuthorOfPublicationf539db86-68ce-416d-9c3d-aab41da52908
relation.isAuthorOfPublication.latestForDiscoveryde486bab-75c6-4f98-8ee1-b27b20edbe2d

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