The national project of the São Francisco river integration on northeast basins, lead by the Braz... more The national project of the São Francisco river integration on northeast basins, lead by the Brazilian Ministry of National Integration, aims to transfer water from this river to different councils of the northeast semiarid region with limited water resources. This study aims to characterize the current ecological status of three northeast reservoirs that will receive water from the São Francisco River. In this work we present results from three monitoring campaigns, in 2009 and 2010, concerning physical-chemical and biological parameters. In relation to physical-chemical and microbiological parameters, the results demonstrated that some of them were in discordance with the legislated standards (total phosphorus, chlorophyll,and some metals). The phytoplankton community was similar in all reservoirs. A high diversity was found in chlorophyceae group, which contrasts with cyanobacteria blooms dominated by Microcystis sp., Anabaena sp. and Cylindrospermopsis raciborskii. In general, t...
RESUMO Este trabalho teve como foco apresentar uma visão geral dos sistemas de informações geográ... more RESUMO Este trabalho teve como foco apresentar uma visão geral dos sistemas de informações geográficas (SIGs) e do sensoriamento remoto (SR), com ênfase nas suas aplicações para obtenção de informações da massa d’água. Essas informações são integradas ao Quadro da Diretiva da Água, e nesse sentido, busca-se propor a ligação dessas informações à Resolução nº 357/2005, de forma a servir de ferramenta para a tomada de decisão em uma gestão estratégica da qualidade da água, principalmente em grandes reservatórios. Assim, é realizada uma revisão integrando as geotecnologias à ciência limnológica e à gestão de reservatórios, ressaltando os possíveis potenciais da interação interdisciplinar. Por fim, é esquematizado um modelo integrando SIGs, SR e limnologia para o monitoramento e a gestão dos padrões de qualidade da água conforme a Resolução nº 357/2005.
In semiarid regions water resources are limited and irregularly distributed over space and time. ... more In semiarid regions water resources are limited and irregularly distributed over space and time. As a result, water scarcity is a reality emphasized by the high evaporation rate recorded in these regions (2000 mm per year). In consequence, the management of water ...
Blooms of toxic cyanobacteria are very common in Brazilian waterbodies, as a consequence of eutro... more Blooms of toxic cyanobacteria are very common in Brazilian waterbodies, as a consequence of eutrophication processes. Our investigations were focused on the detection of neurotoxins during a cyanobacterial bloom in Tapacurá reservoir, which serves as a water supply for Recife city in northeastern Brazil. We also investigated the possible presence of neurotoxins in strains of Anabaena spiroides isolated from this environment. Samples were collected from March to May 2002 at the water surface and close to the dam. Limnological parameters (conductivity, pH, inorganic nutrients) and cyanobacterial abundance were measured. The samples were assayed for toxicity by mouse bioassay and acetylcholinesterase-inhibiting activity by a colorimetric method; saxitoxins (paralytic shellfish poisons) were quantified by a HPLC-FLD postcolumn derivatization method. The dominant cyanobacteria during the bloom were found to be A. spiroides, Pseudanabaena sp., Cylindrospermopsis raciborskii and Microcystis aeruginosa. The mouse bioassays showed the presence of neurotoxins during both A. spiroides and C. raciborskii dominance, whereas anticholinesterase activity was only observed during periods of A. spiroides dominance. The A. spiroides strains isolated during the study also exhibited an acetylcholinesterase inhibitor. HPLC-FLD chromatograms of bloom material extracts revealed the presence of saxitoxin, neosaxitoxin and dc-saxitoxin, probably produced by C. raciborskii.
In semiarid regions water resources are limited and irregularly distributed over space and time. ... more In semiarid regions water resources are limited and irregularly distributed over space and time. As a result, water scarcity is a reality emphasized by the high evaporation rate recorded in these regions (2000 mm per year). In consequence, the management of water ...
The national project of the São Francisco river integration on northeast basins, lead by the Braz... more The national project of the São Francisco river integration on northeast basins, lead by the Brazilian Ministry of National Integration, aims to transfer water from this river to different councils of the northeast semiarid region with limited water resources. This study aims to characterize the current ecological status of three northeast reservoirs that will receive water from the São Francisco River. In this work we present results from three monitoring campaigns, in 2009 and 2010, concerning physical-chemical and biological parameters. In relation to physical-chemical and microbiological parameters, the results demonstrated that some of them were in discordance with the legislated standards (total phosphorus, chlorophyll,and some metals). The phytoplankton community was similar in all reservoirs. A high diversity was found in chlorophyceae group, which contrasts with cyanobacteria blooms dominated by Microcystis sp., Anabaena sp. and Cylindrospermopsis raciborskii. In general, t...
RESUMO Este trabalho teve como foco apresentar uma visão geral dos sistemas de informações geográ... more RESUMO Este trabalho teve como foco apresentar uma visão geral dos sistemas de informações geográficas (SIGs) e do sensoriamento remoto (SR), com ênfase nas suas aplicações para obtenção de informações da massa d’água. Essas informações são integradas ao Quadro da Diretiva da Água, e nesse sentido, busca-se propor a ligação dessas informações à Resolução nº 357/2005, de forma a servir de ferramenta para a tomada de decisão em uma gestão estratégica da qualidade da água, principalmente em grandes reservatórios. Assim, é realizada uma revisão integrando as geotecnologias à ciência limnológica e à gestão de reservatórios, ressaltando os possíveis potenciais da interação interdisciplinar. Por fim, é esquematizado um modelo integrando SIGs, SR e limnologia para o monitoramento e a gestão dos padrões de qualidade da água conforme a Resolução nº 357/2005.
In semiarid regions water resources are limited and irregularly distributed over space and time. ... more In semiarid regions water resources are limited and irregularly distributed over space and time. As a result, water scarcity is a reality emphasized by the high evaporation rate recorded in these regions (2000 mm per year). In consequence, the management of water ...
Blooms of toxic cyanobacteria are very common in Brazilian waterbodies, as a consequence of eutro... more Blooms of toxic cyanobacteria are very common in Brazilian waterbodies, as a consequence of eutrophication processes. Our investigations were focused on the detection of neurotoxins during a cyanobacterial bloom in Tapacurá reservoir, which serves as a water supply for Recife city in northeastern Brazil. We also investigated the possible presence of neurotoxins in strains of Anabaena spiroides isolated from this environment. Samples were collected from March to May 2002 at the water surface and close to the dam. Limnological parameters (conductivity, pH, inorganic nutrients) and cyanobacterial abundance were measured. The samples were assayed for toxicity by mouse bioassay and acetylcholinesterase-inhibiting activity by a colorimetric method; saxitoxins (paralytic shellfish poisons) were quantified by a HPLC-FLD postcolumn derivatization method. The dominant cyanobacteria during the bloom were found to be A. spiroides, Pseudanabaena sp., Cylindrospermopsis raciborskii and Microcystis aeruginosa. The mouse bioassays showed the presence of neurotoxins during both A. spiroides and C. raciborskii dominance, whereas anticholinesterase activity was only observed during periods of A. spiroides dominance. The A. spiroides strains isolated during the study also exhibited an acetylcholinesterase inhibitor. HPLC-FLD chromatograms of bloom material extracts revealed the presence of saxitoxin, neosaxitoxin and dc-saxitoxin, probably produced by C. raciborskii.
In semiarid regions water resources are limited and irregularly distributed over space and time. ... more In semiarid regions water resources are limited and irregularly distributed over space and time. As a result, water scarcity is a reality emphasized by the high evaporation rate recorded in these regions (2000 mm per year). In consequence, the management of water ...
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