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Light as a driver of phytoplankton growth and production in the freshwater tidal zone of a turbid estuary

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dc.contributor.authorDomingues, Rita B.
dc.contributor.authorAnselmo, Tânia P.
dc.contributor.authorBarbosa, Ana B.
dc.contributor.authorSommer, Ulrich
dc.contributor.authorGalvão, Helena M.
dc.date.accessioned2012-11-29T14:51:00Z
dc.date.available2012-11-29T14:51:00Z
dc.date.issued2011
dc.description.abstractLight is usually the main driver of phytoplankton growth in turbid estuaries, but it has received far less attention than nutrients as a bottom-up factor. This study presents the first experimental analysis of light limitation of phytoplankton growth and production and its seasonal variability in the freshwater tidal reaches of the turbid Guadiana estuary, SE Portugal/SW Spain. Natural phytoplankton communities were exposed to different photosynthetically active radiation (PAR) intensities. Short-term incubations with addition of 14HCO3 were used to estimate photosynthetic parameters and long-term incubations allowed the evaluation of the effects of light on phytoplankton composition and growth. Light limitation of phytoplankton growth occurred throughout the year in the freshwater tidal reaches of the estuary and no photoinhibition was observed at least up to 615 mmol photonsm 2 s 1. In the summer, co-limitation by nutrients prevented a positive response of phytoplankton to light enrichment. Diatoms were the most light-limited group, whilst cyanobacteria were the only group acclimated to low-light conditions. Green algae and dinoflagellates responded positively to higher PAR exposures. High saturating irradiances, high light-saturated rates of primary production and low photosynthetic efficiencies suggest that phytoplankton community was not acclimated to the low-light conditions that prevail in the Guadiana estuary.por
dc.identifier.citationDomingues RB, TP Anselmo, AB Barbosa, U Sommer and HM Galvão, 2011. Light as a driver of phytoplankton growth and production in the freshwater tidal zone of a turbid estuary. Estuarine, Coastal and Shelf Science 91 (4): 526-535.por
dc.identifier.otherAUT: HGA00327; ABA00694;
dc.identifier.urihttp://hdl.handle.net/10400.1/1899
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevier Lta.por
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.ecss.2010.12.008por
dc.subjectPhytoplanktonpor
dc.subjectLight limitationpor
dc.subjectPrimary productionpor
dc.subjectPhotosynthetic parameterspor
dc.subjectGuadiana estuarypor
dc.titleLight as a driver of phytoplankton growth and production in the freshwater tidal zone of a turbid estuarypor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage535por
oaire.citation.issue4por
oaire.citation.startPage526por
oaire.citation.titleEstuarine, Coastal and Shelf Sciencepor
oaire.citation.volume91por
person.familyNameDomingues
person.familyNameBarbosa
person.familyNameGalvão
person.givenNameRita
person.givenNameAna
person.givenNameHelena
person.identifier640932
person.identifier1291299
person.identifier.ciencia-id7417-4EEC-3408
person.identifier.ciencia-idF514-2180-4CF8
person.identifier.ciencia-idC51A-2C5A-CF8D
person.identifier.orcid0000-0002-7107-8222
person.identifier.orcid0000-0002-7402-246X
person.identifier.orcid0000-0003-0939-8994
person.identifier.scopus-author-id8627143500
person.identifier.scopus-author-id7103244778
person.identifier.scopus-author-id6505974701
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication43632aa6-ab1f-4c52-8737-dc069bc29291
relation.isAuthorOfPublication5b72648c-41b5-46c0-9a7f-7fa2f514b973
relation.isAuthorOfPublicationef31f343-34f9-4aec-a095-e070235d23b3
relation.isAuthorOfPublication.latestForDiscoveryef31f343-34f9-4aec-a095-e070235d23b3

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