Cyanobacterial blooms in stratified and destratified eutrophic reservoirs in semi-arid region of Brazil

Detalhes bibliográficos
Autor(a) principal: Dantas,Ênio W.
Data de Publicação: 2011
Outros Autores: Moura,Ariadne N., Bittencourt-Oliveira,Maria do Carmo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Anais da Academia Brasileira de Ciências (Online)
Texto Completo: http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400019
Resumo: This study investigated the dynamics of cyanobacteria in two deep, eutrophic reservoirs in a semi-arid region of Brazil during periods of stratification and destratification. Four collections were carried out at each reservoir at two depths at three-month intervals. The following abiotic variables were analyzed: water temperature, dissolved oxygen, pH, turbidity, water transparency, total phosphorus, total dissolved phosphorus, orthophosphate and total nitrogen. Phytoplankton density was quantified for the determination of the biomass of cyanobacteria. The data were analyzed using CCA. Higher mean phytoplankton biomass values (29.8 mm³.L-1) occurred in the period of thermal stratification. A greater similarity in the phytoplankton communities also occurred in this period and was related to the development of cyanobacteria, mainly Cylindrospermopsis raciborskii (>3.9 mm³.L-1). During the period of thermal destratification, this species co-dominated the environment with Planktothrix agardhii, Geitlerinema amphibium, Microcystis aeruginosa and Merismopedia tenuissima, as well as with diatoms and phytoflagellates. Environmental instability and competition among algae hindered the establishment of blooms more during the mixture period than during the stratification period. Thermal changes in the water column caused by climatologic events altered other physiochemical conditions of the water, leading to changes in the composition and biomass of the cyanobacterial community in tropical reservoirs.
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spelling Cyanobacterial blooms in stratified and destratified eutrophic reservoirs in semi-arid region of BrazilbiomassCylindrospermopsis raciborskiiseasonal dynaicstheral patternThis study investigated the dynamics of cyanobacteria in two deep, eutrophic reservoirs in a semi-arid region of Brazil during periods of stratification and destratification. Four collections were carried out at each reservoir at two depths at three-month intervals. The following abiotic variables were analyzed: water temperature, dissolved oxygen, pH, turbidity, water transparency, total phosphorus, total dissolved phosphorus, orthophosphate and total nitrogen. Phytoplankton density was quantified for the determination of the biomass of cyanobacteria. The data were analyzed using CCA. Higher mean phytoplankton biomass values (29.8 mm³.L-1) occurred in the period of thermal stratification. A greater similarity in the phytoplankton communities also occurred in this period and was related to the development of cyanobacteria, mainly Cylindrospermopsis raciborskii (>3.9 mm³.L-1). During the period of thermal destratification, this species co-dominated the environment with Planktothrix agardhii, Geitlerinema amphibium, Microcystis aeruginosa and Merismopedia tenuissima, as well as with diatoms and phytoflagellates. Environmental instability and competition among algae hindered the establishment of blooms more during the mixture period than during the stratification period. Thermal changes in the water column caused by climatologic events altered other physiochemical conditions of the water, leading to changes in the composition and biomass of the cyanobacterial community in tropical reservoirs.Academia Brasileira de Ciências2011-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400019Anais da Academia Brasileira de Ciências v.83 n.4 2011reponame:Anais da Academia Brasileira de Ciências (Online)instname:Academia Brasileira de Ciências (ABC)instacron:ABC10.1590/S0001-37652011000400019info:eu-repo/semantics/openAccessDantas,Ênio W.Moura,Ariadne N.Bittencourt-Oliveira,Maria do Carmoeng2011-11-29T00:00:00Zoai:scielo:S0001-37652011000400019Revistahttp://www.scielo.br/aabchttps://old.scielo.br/oai/scielo-oai.php||aabc@abc.org.br1678-26900001-3765opendoar:2011-11-29T00:00Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)false
dc.title.none.fl_str_mv Cyanobacterial blooms in stratified and destratified eutrophic reservoirs in semi-arid region of Brazil
title Cyanobacterial blooms in stratified and destratified eutrophic reservoirs in semi-arid region of Brazil
spellingShingle Cyanobacterial blooms in stratified and destratified eutrophic reservoirs in semi-arid region of Brazil
Dantas,Ênio W.
biomass
Cylindrospermopsis raciborskii
seasonal dynaics
theral pattern
title_short Cyanobacterial blooms in stratified and destratified eutrophic reservoirs in semi-arid region of Brazil
title_full Cyanobacterial blooms in stratified and destratified eutrophic reservoirs in semi-arid region of Brazil
title_fullStr Cyanobacterial blooms in stratified and destratified eutrophic reservoirs in semi-arid region of Brazil
title_full_unstemmed Cyanobacterial blooms in stratified and destratified eutrophic reservoirs in semi-arid region of Brazil
title_sort Cyanobacterial blooms in stratified and destratified eutrophic reservoirs in semi-arid region of Brazil
author Dantas,Ênio W.
author_facet Dantas,Ênio W.
Moura,Ariadne N.
Bittencourt-Oliveira,Maria do Carmo
author_role author
author2 Moura,Ariadne N.
Bittencourt-Oliveira,Maria do Carmo
author2_role author
author
dc.contributor.author.fl_str_mv Dantas,Ênio W.
Moura,Ariadne N.
Bittencourt-Oliveira,Maria do Carmo
dc.subject.por.fl_str_mv biomass
Cylindrospermopsis raciborskii
seasonal dynaics
theral pattern
topic biomass
Cylindrospermopsis raciborskii
seasonal dynaics
theral pattern
description This study investigated the dynamics of cyanobacteria in two deep, eutrophic reservoirs in a semi-arid region of Brazil during periods of stratification and destratification. Four collections were carried out at each reservoir at two depths at three-month intervals. The following abiotic variables were analyzed: water temperature, dissolved oxygen, pH, turbidity, water transparency, total phosphorus, total dissolved phosphorus, orthophosphate and total nitrogen. Phytoplankton density was quantified for the determination of the biomass of cyanobacteria. The data were analyzed using CCA. Higher mean phytoplankton biomass values (29.8 mm³.L-1) occurred in the period of thermal stratification. A greater similarity in the phytoplankton communities also occurred in this period and was related to the development of cyanobacteria, mainly Cylindrospermopsis raciborskii (>3.9 mm³.L-1). During the period of thermal destratification, this species co-dominated the environment with Planktothrix agardhii, Geitlerinema amphibium, Microcystis aeruginosa and Merismopedia tenuissima, as well as with diatoms and phytoflagellates. Environmental instability and competition among algae hindered the establishment of blooms more during the mixture period than during the stratification period. Thermal changes in the water column caused by climatologic events altered other physiochemical conditions of the water, leading to changes in the composition and biomass of the cyanobacterial community in tropical reservoirs.
publishDate 2011
dc.date.none.fl_str_mv 2011-12-01
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400019
url http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400019
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 10.1590/S0001-37652011000400019
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv text/html
dc.publisher.none.fl_str_mv Academia Brasileira de Ciências
publisher.none.fl_str_mv Academia Brasileira de Ciências
dc.source.none.fl_str_mv Anais da Academia Brasileira de Ciências v.83 n.4 2011
reponame:Anais da Academia Brasileira de Ciências (Online)
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instname_str Academia Brasileira de Ciências (ABC)
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reponame_str Anais da Academia Brasileira de Ciências (Online)
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repository.name.fl_str_mv Anais da Academia Brasileira de Ciências (Online) - Academia Brasileira de Ciências (ABC)
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