Monitoramento do Fitoplâncton para a Qualidade da Água de Abastecimento Público ? Estudo de Caso de Mananciais do Rio Grande do Sul

Müller, Carla Cristine; Cybis, Luiz Fernando de Abreu; Rodriguez, Maria Teresa Raya

doi:10.21168/rbrh.v17n2.p203-211

Cited by 4 publications

(5 citation statements)

References 3 publications

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“…The lower survival recorded in the SC1 and LC treatments is possibly related to factors discussed above, such as cyanobacterial bloom. The emergence of cyanobacteria has negative effects on production (Chellappa et al, 2008; Soares et al, 2004) As some authors report that cyanophytes produce toxins that can be lethal to aquatic animals (Müller & Raya‐Rodriguez, 2012; Soares et al, 2004), in this way, some studies found higher survival rates than those reported in this work, such as Sareban et al (2013), with two cycles per year, obtained an 80% survival rate, and as Balakrishnan et al (2011) working with different stocking densities recorded a survival rate of 82% at the end of the cycle.…”

Section: Discussionmentioning

confidence: 99%

Comparative strategies for intensive shrimp production in ponds using biofloc technology system in Southern Brazil: Water quality, zootechnical performance and economic viability forLitopenaeus vannamei

Poersch

Magalhães

Lara

et al. 2021

Aquaculture Research

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The present study aimed to compare a Litopenaeus vannamei culture throughout two short cycles and one long cycle of production in a BFT (biofloc technology) system.The study was conducted in six lined 600-m 2 ponds and was composed of two treatments with three replicates each: two short consecutive crops (SC) of 75 days and a 150-day long cycle (LC). Stocking density was 42 shrimp m −2 for all cycles, and initial weight was 1.20 g in SC1 and LC and 1.40 g in SC2. Economic analysis was also carried out to compare the results of treatments. In terms of water quality, sedimentable solids and turbidity were significantly higher in the LC treatment. All other water quality parameters presented no significative differences between treatments, and mean values were maintained within the recommended levels for shrimp culture. There was a significant difference in the final average weights between treatments, with the value of the long treatment being greater than twice the values of the short cycles.The productivity did not differ significantly between the sum of the SC and LC treatments. Production data were assessed using economic indicators. The treatment results show positive Gross and Net Margin; however, SC1 negatively influenced the SC result, mainly for ML and IL. The best result of the profitability index was the LC.The results of the present study and considering the strategies used, there was no influence on productivity, but on profitability in the cultivation of L. vannamei in lined ponds under subtropical conditions.

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Section: Discussionmentioning

confidence: 99%

Comparative strategies for intensive shrimp production in ponds using biofloc technology system in Southern Brazil: Water quality, zootechnical performance and economic viability forLitopenaeus vannamei

Poersch

Magalhães

Lara

et al. 2021

Aquaculture Research

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“…The number of individuals had significant correlation (p<0.05) between conductivity (r=0.72), turbidity (0.46), alkalinity (r=0.56) and total phosphorus (r=0.47). M. aeruginosa is frequently found in eutrophic environments (REYNOLDS et al, 2002;SANT'ANNA et al, 2004;CHELLAPPA et al, 2009;ROLLAND et al, 2009;WANG et al, 2011;MÜLLER et al, 2012;LIU et al, 2012) and can provoke sanitation issues, mainly due to toxicity (BLACK;YILMAZ;PHLIPS, 2011;REICHWALDT;GHADOUANI, 2012).…”

Section: Relation Between Phytoplankton and Abiotic Factorsmentioning

confidence: 99%

Analysis of the phytoplankton community emphasizing cyanobacteria in four cascade reservoirs system of the Iguazu River, Paraná, Brazil

Adloff

Cristina

Reichert

et al. 2018

RBRH

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Knowing the ecological changes in a reservoir is of great relevance to study environmental impacts and assess water quality. Among these studies, the knowledge about the structure of the phytoplankton community is essential, once they represent a fundamental component of aquatic ecosystems, responding immediately to physical and chemical alterations in water. The objective of this work was to analyze the phytoplankton community and the influence of abiotic factors, along the longitudinal axis in four cascade reservoirs system of the Iguazu River, Paraná, Brazil, emphasizing the importance of cyanobacteria. Foz do Areia, Salto Segredo, Salto Santiago and Salto Caxias reservoirs were the objects of this study. The phytoplankton counting was made tubular sedimentation chamber using an inverted microscope. The results showed that the four reservoirs are under eutrophication processes, presenting intense cyanobacteria blooms, dominated mainly by Microcystis aeruginosa and Sphaerocavum brasiliense. There was no evident longitudinal gradient related to phytoplankton, as expected for reservoirs in a cascade system. The dominance of cyanobacteria shows that the Iguazu River is undergoing an intense process of environmental degradation, threatening the integrity of biological communities and causing serious damage to the ecosystem as a whole.Keywords: Eutrophication; Water quality; Hydroelectric reservoirs; Limnology. RESUMOConhecer as alterações ecológicas em um reservatório é de grande relevância para estudos de impacto ambiental e avaliação de qualidade da água. Dentro desses estudos, o conhecimento da estrutura da comunidade fitoplanctônica é necessário, pois esta comunidade tem uma importância fundamental nos ecossistemas aquáticos, respondendo de forma rápida às mudanças físicas e químicas da água. O objetivo deste trabalho foi analisar a comunidade fitoplanctônica e a influência das variáveis abióticas, considerando o eixo longitudinal em quatro reservatórios de hidrelétricas em cascata do rio Iguazu, Paraná, Brasil, destacando a importância das cianobactérias. Foram amostrados quatro dos reservatórios de hidrelétricas do rio Iguazu: Foz do Areia, Salto Segredo, Salto Santiago e Salto Caxias. A contagem dos indivíduos foi realizada utilizando câmara de sedimentação tubular em microscópio invertido. Os resultados mostraram que os quatros reservatórios estão sujeitos a processos de eutrofização, apresentando intensas florações de cianobactérias, com dominância principalmente de Microcystis aeruginosa e Sphaerocavum brasiliense. Não houve gradiente longitudinal evidente relacionado ao fitoplâncton, como é esperado para reservatórios em sistema de cascata. A dominância de cianobactérias indica que o rio Iguazu está passando por um intenso processo de degradação ambiental, ameaçando a integridade das comunidades biológicas e causando sérios danos ao ecossistema como um todo. Palavras-chave:Eutrofização; Qualidade da água; Reservatórios de hidrelétricas; Limnologia.RBRH, Porto Alegre, v. 23, e6, 2018Analysis of t...

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“…A comunidade aquática fitoplanctônica responde rapidamente às alterações ambientais, seja pela redução de espécies, ou pela ocorrência de florações, isto é, aumento da biomassa de uma ou mais espécies presentes no ambiente (MULLER, 2012). O monitoramento das condições físicas, químicas e biológicas é importante, mas a classificação das algas, com suas flutuações no espaço e no tempo, é fundamental para a identificação das épocas favoráveis aos florescimentos e à concentração de toxinas na água (TUNDISI, 2003).…”

Section: ~ 73 ~unclassified

Piscicultura e meio ambiente: estudos e perspectivas na Amazônia

Cavali¹,

Lopes²

2017

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Legenda:. ♦ = pontos de coleta desflorestados no trecho médio da bacia e • = pontos de coleta florestados no interior da Rebio Jaru. Resultados da pesquisa De acordo com a ordenação das amostras no espaço formado pelos dois primeiros eixos da ACP, as duas áreas foram diferenciadas principalmente em relação à elevada presença de gramíneas, algas aderidas, largura, velocidade da correnteza, barranco nu, liteira grossa, liteira ripária, angiospermas arbustivas e raízes grandes em rede (Figura 3).

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Monitoramento do Fitoplâncton para a Qualidade da Água de Abastecimento Público ? Estudo de Caso de Mananciais do Rio Grande do Sul

Cited by 4 publications

References 3 publications

Comparative strategies for intensive shrimp production in ponds using biofloc technology system in Southern Brazil: Water quality, zootechnical performance and economic viability forLitopenaeus vannamei

Comparative strategies for intensive shrimp production in ponds using biofloc technology system in Southern Brazil: Water quality, zootechnical performance and economic viability forLitopenaeus vannamei

Analysis of the phytoplankton community emphasizing cyanobacteria in four cascade reservoirs system of the Iguazu River, Paraná, Brazil

Piscicultura e meio ambiente: estudos e perspectivas na Amazônia

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