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Changes in a temperate estuary during the filling of the biggest European dam

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dc.contributor.authorMorais, P.
dc.contributor.authorChicharo, Maria Alexandra
dc.contributor.authorChícharo, Luís
dc.date.accessioned2013-02-22T14:32:30Z
dc.date.available2013-02-22T14:32:30Z
dc.date.issued2009
dc.date.updated2013-02-19T14:47:58Z
dc.description.abstractThis study aimed to determinewhether and howthe disruption of river flow, during the filling of the Alqueva dam, influenced the variability of abiotic and biotic factors in the Guadiana estuary, particularly the abundance and distribution of anchovy eggs. River inflow was found to be the most important factor in determining abiotic and biotic variability in the Guadiana estuary. Seasonal patterns were obscured by long periods of low inflow (mid April to early December 2002), which caused marked changes in the estuary. The estuarine turbidity maximum zone was displaced towards the upper estuary, to at least 38 km from the river mouth, 8 to 16 km upstream from previous records. The dynamics of nutrient stoichiometry was also affected. In the upper andmiddle estuary, P was more potential limiting than N and potential Si limitation was only frequent on the coast, with direct and/or indirect influence in changing phytoplankton dynamics and composition. Previously, the upper estuary alternated between potential P limitation duringwinter, Si limitation during spring andmid summer and N limitation duringmid summer and autumn. The flooding of vast areas in the catchment of the dam probably caused the increase of DSi concentrations, as well as maximal N and P loadings. The abundance of larval stages of anchovy decreased, putatively because estuarine productivity has also decreased. In April 2002 there was an uncontrolled discharge from the Alqueva dam, which reduced the abundance of anchovy eggs by 99.99%. It is suggested that dammanagers shouldmimic, asmuch as possible, the natural river flow, in order tominimize the impact on downstream ecosystems. Management efforts should not be restricted to the areas upstreamof the dam, but should also encompass the estuary and adjacent coastal area.por
dc.identifier.citationMorais, P.; Chicharo, M. A.; Chicharo, L. M. Z. Changes in a temperate estuary during the filling of the biggest European dam, Science of the Total Environment, 407, 7, 2245-2259, 2009.por
dc.identifier.issn0048-9697
dc.identifier.otherAUT: MCH00377;
dc.identifier.urihttp://hdl.handle.net/10400.1/2402
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subjectRiver inflowpor
dc.subjectAbiotic and biotic parameterspor
dc.subjectAnchovypor
dc.subjectDam impactpor
dc.subjectAlqueva dampor
dc.subjectGuadiana estuarypor
dc.titleChanges in a temperate estuary during the filling of the biggest European dampor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage2259por
oaire.citation.issue7por
oaire.citation.startPage2245por
oaire.citation.titleScience of the Total Environmentpor
oaire.citation.volume407por
person.familyNameMorais
person.familyNameTeodosio
person.familyNameChicharo
person.givenNamePedro
person.givenNameMaria
person.givenNameLuis
person.identifier424141
person.identifier.ciencia-id1A19-7E90-8BDD
person.identifier.ciencia-idAF10-647B-65FB
person.identifier.ciencia-id6716-EE1C-B995
person.identifier.orcid0000-0002-0861-5566
person.identifier.orcid0000-0002-0939-9885
person.identifier.orcid0000-0002-4933-2300
person.identifier.ridF-2815-2011
person.identifier.ridB-5077-2013
person.identifier.scopus-author-id7005946306
person.identifier.scopus-author-id56196396700
person.identifier.scopus-author-id6602881426
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication1c722a09-343d-4191-9c67-ab86240a4708
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relation.isAuthorOfPublicationd3ff8510-3be1-4a6a-abdd-eb671a819aef
relation.isAuthorOfPublication.latestForDiscoveryb39b2d6d-d6f5-4130-a9b9-4e7624d44676

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