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Cyanobacterial blooms in natural waters in southern Portugal: a water management perspective

2008-09-18Journal article Open access
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dc.contributor.authorGalvão, Helena M.
dc.contributor.authorReis, Margarida P.
dc.contributor.authorValério, Elisabete
dc.contributor.authorDomingues, Rita B.
dc.contributor.authorCosta, Cristina
dc.contributor.authorLourenço, Dulce
dc.contributor.authorCondinho, Sílvia
dc.contributor.authorMiguel, Rute
dc.contributor.authorBarbosa, Ana
dc.contributor.authorGago, Conceição
dc.contributor.authorFaria, Natália
dc.contributor.authorPaulino, Sérgio
dc.contributor.authorPereira, Paulo
dc.date.accessioned2012-10-30T18:41:55Z
dc.date.available2012-10-30T18:41:55Z
dc.date.issued2008-09-18
dc.description.abstractThis synthesis of 3 studies from 2 regions of southern Portugal (Alentejo and Algarve) was part of a workshop focusing on cyanobacteria held at the SAME 10. The first study monitored impacts of the large Alqueva dam on the Guadiana estuary since 1996, revealing changes in sediment load, nutrient regime and phytoplankton succession. Prior to dam construction, dense cyanobacterial blooms occurred in the upper estuary during summer and fall. After dam construction, chlorophyll concentration, phytoplankton diversity and abundances of cyanobacteria decreased, contrary to predictions. Mycrocystins remained at low levels in the seston and undetectable in water samples, except during summer 2003 when the particulate fraction contained 1 µg l–1, while chlorophyll concentrations and abundances of potentially toxic cyanobacteria remained low. Algarve reservoirs studied since 2001 revealed differences in phytoplankton dynamics. In the western mesotrophic reservoirs (Bravura and Funcho), 40 to 50% of surface samples contained cyanobacterial concentrations of ≥2000 cells ml–1, while over 80% of samples from the eastern oligotrophic reservoirs (Odeleite and Beliche) exceeded this value. Spring blooms were dominated by Oscillatoriales in Odeleite and Beliche and by Chroococcales in Bravura and Funcho. Bloom composition seemed to depend on water temperature and management strategies, while toxin concentrations reflected the increased biomass of toxic species. Finally, phytoplankton communities and microcystin production in 5 Alentejo freshwater reservoirs were studied from May to December 2005 and April to July 2006. Cyanobacterial blooms occurred, with varying intensities, not only during summer but also occasionally in winter. Microcystins were detected in 23% of the samples (n = 51), but without correlation with cyanobacterial biomass. Although Microcystis aeruginosa seemed to be the major producer of microcystins, other potentially toxic species were found. In summary, the varying pattern of cyanobacterial bloom occurrence and toxicity requires a systematic approach to monitoring programs for adequate risk assessment.por
dc.identifier.citationAquatic Microbial Ecology 2008;53:129–140por
dc.identifier.issn0948-3055
dc.identifier.otherESSN:1616-1564
dc.identifier.otherdoi: 10.3354/ame01228
dc.identifier.urihttp://hdl.handle.net/10400.18/1103
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherInter Researchpor
dc.relation.publisherversionhttp://www.int-res.com/abstracts/ame/v53/n1/p129-140/por
dc.subjectCyanobacteriapor
dc.subjectMicrocystinspor
dc.subjectPhytoplanktonpor
dc.subjectEstuarypor
dc.subjectFreshwater Reservoirspor
dc.subjectÁgua e Solopor
dc.titleCyanobacterial blooms in natural waters in southern Portugal: a water management perspectivepor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage140por
oaire.citation.startPage129por
oaire.citation.volume53por
rcaap.rightsopenAccesspor
rcaap.typearticlepor

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