The ecological dynamics of Barra Bonita (Tietê River, SP, Brazil) reservoir: implications for its biodiversity

Tundisi, José Galízia; Matsumura‐Tundisi, Takako; Abe, Donato Seiji

doi:10.1590/s1519-69842008000500015

Cited by 68 publications

(61 citation statements)

References 24 publications

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“…The only site at which a high density of zooplankton was found was near the entrance of the Jaguari river, probably reflecting the higher trophic conditions suggested by the high phosphorus and chlorophyll concentrations (TSI value = 69). The fall in zooplankton at the end of the rainy season has also been observed in other reservoirs, as in the Guarapiranga reservoir, by Sendacz et al (2006), and the Barra Bonita reservoir, by Tundisi et al (2008).…”

Section: Discussionsupporting

confidence: 54%

“…Tundisi et al (2008) indicated that, in the Barra Bonita reservoir, the highest concentration of nutrients occurs at the beginning of the rainfall, due to entrainment of soil particles from runoff and via tributaries; however, after some time, a diluting effect may occurs because of the increased volume of water, reducing the concentration of nutrients. This may explain why, despite the high rates of TSI during the rainy season, caused by the importing of nutrients, zooplankton communities have low densities, possibly due to dilution caused by excess rainfall.…”

Section: Discussionmentioning

confidence: 99%

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Zooplankton communities as eutrophication bioindicators in tropical reservoirs

2014

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Eutrophication is a process characterized by an increase in the aquatic system productivity, which causes profound changes in the structure of its communities. Owing to the high environmental sensitivity of planktonic species, the study of their communities can indicate the deterioration of the environment. The Jaguari and Jacareí reservoirs are part of the Cantareira System, supplying water to Sã o Paulo inhabitants and that has been affected by several forms of continuous human interference.Here we analyze some properties of the zooplankton community as bioindicators of eutrophication and water quality change. In situ physical and chemical measurements were carried out, water was collected for analysis and quantitative zooplankton samples were taken at eight sites in the two reservoirs, in both seasons, dry and rainy. Species were identified and their numerical abundances and biomasses were determined and used to estimate two biological indices. The overall trophic state and zooplankton structure, the Calanoida/Cyclopoida ratio and the k-dominance curves were associated with the disturbance levels, mainly represented by nutrient river inputs and by water level fluctuations. The Jaguari Reservoir was more eutrophicated than the Jacareí Reservoir, as evidenced by the obtained indices values. The zooplankton community properties used as indicators of the reservoir trophic state were useful monitoring tools. Keywords: zooplankton, ABC curves, Calanoida/Cyclopoida ratio, Cantareira System, environmental impact.GAZONATO NETO, A.J., SILVA, L.C., SAGGIO, A.A., ROCHA, O Comunidades zooplanctônicas como bioindicadoras de eutrofização em reservatórios tropicais.http://dx.doi. org/10.1590/1676-06032014001814Resumo: A eutrofização é um processo caracterizado pelo aumento da produtividade do sistema aquá tico, o que provoca profundas alteraçõ es na estrutura de suas comunidades. Devido à alta sensibilidade ambiental das espécies planctô nicas, o estudo de suas comunidades pode indicar a deterioraçã o do ambiente. Os reservató rios Jaguari e Jacareí sã o parte do Sistema Cantareira, que fornece á gua para os habitantes de Sã o Paulo e que tem sido afetado por diversas formas de contínua interferência humana. Neste trabalho vamos analisar algumas propriedades da comunidade zooplanctô nica como bioindicadoras de eutrofizaçã o e alteraçã o da qualidade da á gua. Foram realizadas mediçõ es in situ de variá veis físicas e químicas, amostras de á gua foram coletadas para aná lises e amostras quantitativas de zooplâ ncton foram coletadas em oito localidades compreendendo os dois reservató rios, em duas estaçõ es, seca e chuvosa. As espécies foram identificadas e suas abundâ ncias numéricas e biomassas foram determinadas e utilizadas para estimar dois índices bioló gicos. O estado tró fico e a estrututa do zooplâ ncton, a relaçã o Calanoida / Cyclopoida e as curvas de k-dominâ ncia foram associados com os níveis de perturbaçã o, representada principalmente pela entrada de nutrientes transportados pelo rio e pelas flutuaçõ ...

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Section: Discussionsupporting

confidence: 54%

Section: Discussionmentioning

confidence: 99%

Zooplankton communities as eutrophication bioindicators in tropical reservoirs

2014

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“…Variables associated with anthropogenic activities with impact on water quality were positively correlated. That was the case of the correlation of E.coli density and NO 2 -and SO 4 -2 concentrations, indicating that those environments receive domestic sewage discharge without pretreatment (Tundisi et al, 2008;Zhao et al, 2011). The correlation of COND with NO 2 -may also be an indicative of local human impacts.…”

Section: Discussionmentioning

confidence: 93%

“…Conditions of topography and land use are also important factors that influence the water quality in lotic environments (Sheldon et al, 2012), requiring the use of methods of study that focus both the ecological and anthropogenic processes occurring in the landscape scale and/or in the watershed as a whole (Likens, 1984;Wiens, 1989;Zalewski, 2000;Turner et al, 2001;Tundisi et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Spatial patterns of water quality in Xingu River Basin (Amazonia) prior to the Belo Monte dam impoundment

et al. 2015

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The Xingu River, one of the most important of the Amazon Basin, is characterized by clear and transparent waters that drain a 509.685 km 2 watershed with distinct hydrological and ecological conditions and anthropogenic pressures along its course. As in other basins of the Amazon system, studies in the Xingu are scarce. Furthermore, the eminent construction of the Belo Monte for hydropower production, which will alter the environmental conditions in the basin in its lower middle portion, denotes high importance of studies that generate relevant information that may subsidize a more balanced and equitable development in the Amazon region. Thus, the aim of this study was to analyze the water quality in the Xingu River and its tributaries focusing on spatial patterns by the use of multivariate statistical techniques, identifying which water quality parameters were more important for the environmental changes in the watershed. Data sampling were carried out during two complete hydrological cycles in twenty-five sampling stations. The data of twenty seven variables were analyzed by Spearman's correlation coefficients, cluster analysis (CA), and principal component analysis (PCA). The results showed a high auto-correlation between variables (> 0.7). These variables were removed from multivariate analyzes because they provided redundant information about the environment. The CA resulted in the formation of six clusters, which were clearly observed in the PCA and were characterized by different water quality. The statistical results allowed to identify a high spatial variation in the water quality, which were related to specific features of the environment, different uses, influences of anthropogenic activities and geochemical characteristics of the drained basins. It was also demonstrated that most of the sampling stations in the Xingu River basin showed good water quality, due to the absence of local impacts and high power of depuration of the river itself.Keywords: watershed, limnology, water quality, Amazonian rivers, hydropower dam. Padrões espaciais de qualidade de água na Bacia do Rio Xingu (Amazônia) anteriores a barragem de Belo MonteResumo O rio Xingu, um dos mais importantes rios que constituem a bacia amazônica, é caracterizado por águas claras e transparentes que drenam uma bacia hidrográfica de 509,685 km 2 com distintas condições hidrológicas, ecológicas e pressões antrópicas ao longo de seu percurso. Assim como nas demais bacias hidrográficas da Amazônia, os estudos no Xingu são raros. A eminente construção da Usina hidrelétrica de Belo Monte, a qual alterará as condições ambientais na bacia, demanda também a realização de estudos que gerem informações relevantes e que forneçam subsídios para um desenvolvimento mais equilibrado e igualitário região amazônica. Desta maneira, o objetivo deste trabalho foi analisar a qualidade de água no rio Xingu e em seus tributários focando em padrões espaciais na área de estudo pelo uso de técnicas de estatística multivariada, identificando quais parâmetros são ...

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“…Nothwithstanding the difficulties in establishing the concentration limits which characterize mesotrophic, eutrophic and hypereutrophic conditions (Tundisi et al, 2008) …”

Section: Resultsmentioning

confidence: 99%