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Inter-annual differences of ichthyofauna structure of the Guadiana estuary and adjacent coastal area (SE Portugal/SW Spain): before and after Alqueva dam construction

2006Journal article Restricted access
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dc.contributor.authorChicharo, Maria Alexandra Teodosio
dc.contributor.authorChícharo, Luís
dc.contributor.authorMorais, P.
dc.date.accessioned2013-02-25T15:30:28Z
dc.date.available2013-02-25T15:30:28Z
dc.date.issued2006
dc.date.updated2013-02-19T15:27:20Z
dc.description.abstractThe objective of this study was to evaluate how inter-annual changes in the volume of freshwater input and water parameters (salinity, temperature, major dissolved nutrients, seston and chlorophyll a) affect fish assemblages in the Guadiana estuary (South Portugal). During the sampling period (two distinct hydrological years), 56 fish species were identified. Anchovies (Engraulis encrasicolus) and barbells (Barbus species) dominated the abundances in the high inflow year (2001), but Pomatoschistus species were the most important taxa in the low inflow year (2002). Barbells and Portuguese toadfish (Halobatrachus didactylus) dominated the biomass in both years under different inflow conditions, but a reduction in barbells’ biomass occurred during the low inflow year. Multivariate analysis indicated a persistent spatial structuring of the estuarine community for both years and in different seasonal periods. Changes in salinity and seston, which were mainly due to changes in freshwater input, had an important influence on the structure of the fish assemblages. In 2002, the increased salinity in the upper estuary allowed colonization by marine species of an area that usually contains freshwater, decreasing even more the habitat for indigenous freshwater species in the downstream area of the Guadiana River. There was also a decrease in the abundances of planktivorous and omnivorous fishes and an increase in carnivorous fishes during the low inflow year. As fishes in these systems are important regulators of processes in the trophic web, changes in the dominant feeding groups can have consequences on water quality, particularly in relation to the occurrence of plankton blooms.por
dc.identifier.citationChicharo, M. A.; Chicharo, L. M. Z.; Morais, P. Inter-annual differences of ichthyofauna structure of the Guadiana estuary and adjacent coastal area (SE Portugal/SW Spain): before and after Alqueva dam construction, Estuarine Coastal and Shelf Science, 70, 1-2, 39-51, 2006.por
dc.identifier.issn0272-7714
dc.identifier.otherAUT: MCH00377;
dc.identifier.urihttp://hdl.handle.net/10400.1/2418
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevierpor
dc.subjectEstuarine fishpor
dc.subjectCommunity diversitypor
dc.subjectEstuarine environmentpor
dc.subjectEcosystempor
dc.subjectManagementpor
dc.subjectFreshwater-seawater interfacepor
dc.titleInter-annual differences of ichthyofauna structure of the Guadiana estuary and adjacent coastal area (SE Portugal/SW Spain): before and after Alqueva dam constructionpor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage51por
oaire.citation.issue1-2por
oaire.citation.startPage39por
oaire.citation.titleEstuarine Coastal and Shelf Sciencepor
oaire.citation.volume70por
person.familyNameTeodosio
person.familyNameChicharo
person.familyNameMorais
person.givenNameMaria
person.givenNameLuis
person.givenNamePedro
person.identifier424141
person.identifier.ciencia-idAF10-647B-65FB
person.identifier.ciencia-id6716-EE1C-B995
person.identifier.ciencia-id1A19-7E90-8BDD
person.identifier.orcid0000-0002-0939-9885
person.identifier.orcid0000-0002-4933-2300
person.identifier.orcid0000-0002-0861-5566
person.identifier.ridB-5077-2013
person.identifier.ridF-2815-2011
person.identifier.scopus-author-id56196396700
person.identifier.scopus-author-id6602881426
person.identifier.scopus-author-id7005946306
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublicationb39b2d6d-d6f5-4130-a9b9-4e7624d44676
relation.isAuthorOfPublicationd3ff8510-3be1-4a6a-abdd-eb671a819aef
relation.isAuthorOfPublication1c722a09-343d-4191-9c67-ab86240a4708
relation.isAuthorOfPublication.latestForDiscovery1c722a09-343d-4191-9c67-ab86240a4708

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