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River damming leads to decreased phytoplankton biomass and disappearance of cyanobacteria blooms

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dc.contributor.authorDomingues, Rita B.
dc.contributor.authorBarbosa, Ana B.
dc.contributor.authorGalvão, Helena M.
dc.date.accessioned2014-09-22T13:30:41Z
dc.date.available2014-09-22T13:30:41Z
dc.date.issued2014
dc.description.abstractThe large Alqueva dam was built in the early 2000s in the Guadiana River (southern Portugal) and has highly controlled the freshwater flowing into the Guadiana estuary, leading to significant changes in the natural hydrological regime. To evaluate the impacts of water restriction and flow regularization on estuarine phytoplankton and their environmental variables, sampling campaigns were conducted in the Guadiana estuary throughout a 14-year period, covering different phases related to the Alqueva dam construction. Significant alterations in phytoplankton and their environmental drivers were observed. In the post-filling period, river flow became more constant throughout the year and its natural seasonal variability, with maxima in the winter and minima in the summer, was greatly reduced, leading to higher river flows in the summer and lower in the winter, in relation to the pre-filling phase. Nutrient and light availability and, hence, phytoplankton dynamics, were greatly affected. Phytoplankton abundance and biomass decreased in the post-filling phase related to a decrease in diatoms and cyanobacteria. Since cyanobacteria blooms in the Guadiana are frequently dominated by toxic species, this constitutes an improvement in water quality. However, the overall decrease in phytoplankton biomass and, specifically, the decline in diatom biomass, will have major consequences for the higher trophic levels that depend on planktonic food.por
dc.identifier.doihttp://dx.doi/org/10.1016/j.ecss.2013.11.012
dc.identifier.issn0272-7714
dc.identifier.otherAUT: ABA00694; HGA00327;
dc.identifier.urihttp://hdl.handle.net/10400.1/5043
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subjectRiver impoundmentpor
dc.subjectEstuariespor
dc.subjectPhytoplanktonpor
dc.subjectCyanobacteria bloomspor
dc.subjectAnthropogenic impactspor
dc.titleRiver damming leads to decreased phytoplankton biomass and disappearance of cyanobacteria bloomspor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage138por
oaire.citation.startPage129por
oaire.citation.titleEstuarine Coastal and Shelf Sciencepor
oaire.citation.volume136por
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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