Limnology and management of reservoirs in Brazil

Tundisi, J. G.; Matsumura‐Tundisi, Takako; Calijuri, Maria do Carmo

doi:10.1007/978-94-017-1096-1_2

Cited by 79 publications

(70 citation statements)

References 27 publications

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“…Initial deoxygenation of the lake was much less pronounced than that expected from information from other tropical reservoirs (Van der Lingen, 1973;Van der Heide, 1982;Barrow, 1987;Junk & de Mello, 1987;Tundisi et al, 1993) and oxygen concentrations on the water surface never dropped below 63% saturation (Table 1). However, during stratification, deoxygenation of water occurred at lacustrine regions, and oxygen concentrations in the lower layer dropped to < 1 mg.L -1 .…”

Section: Resultsmentioning

confidence: 78%

“…Its main morphometric characteristics are: length of 66.5 km; surface area of 1.600 km 2 at 82 m above sea level; volume of 21,000 hm 3 ; maximum depth of 30 m. Compared with other reservoirs built on the Paraná River (Tundisi et al, 1993) its retention time is short (< 20 days). The lake area, which was mainly covered by various types of forests, swamps, ponds and peatland soils, was deficiently cleared before the dam was closed.…”

Section: Introductionmentioning

confidence: 99%

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Prediction of colonization by macrophytes in the Yaciretá reservoir of the Paraná River (Argentina and Paraguay)

Neiff

Patiño

et al. 2000

Rev. Bras. Biol.

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The potential colonization by anchored plants (PCAP) and the potential areas for initial colonization of free floating plants were estimated during the early filling phase for the Yaciretá reservoir. In order to obtain the PCAP, the observed maximum depth of colonization of the anchored macrophytes before impoundment and the hypsographic curves were used. The species inhabiting the preimpoundment area were classified according to the different bioforms before the inclussion in the analysis. The areal extent of PCAP (from depths between 0-4 m) could reach 275 km 2 at 76 m above sea level (current water level), whereas at 82 m above sea level (final filling level) the littoral zone will be increased by about 21.5%. The potential area for geophytes was estimated to be 99 km 2 ; 131 km 2 for root-floating leaved plants and 120 km 2 for submerged plants, at 76 m above sea level. At 82 m above sea level, the geophytes could reach 271 km 2 . The data for wind frequency, velocity and fetch, together with depth were used to calculate shallow and sheltered areas in which free floating plants could find favourable conditions to initial colonization. Physical and chemical features recorded at eight stations during the early filling phase are discussed in relation to potential plant development.Key words: tropical rivers, impounding reservoirs, South America, potential macrophytes colonization, reservoirs. RESUMO Predição da colonização por macrófitas no reservatório de Yaciretá do Rio ParanáA colonização potencial por plantas enraizadas (CPPE) e as áreas potenciais de colonização por plantas fluentes livres foram calculadas durante a fase de enchimento do reservatório de Yaciretá. Para obter o CPPE, a máxima profundidade de enraizamento observada previa o fechamento do rio e as curvas ipsográficas foram utilizadas. As espécies presentas na área pré-represamento foram classificadas de acordo com as diferentes bioformas antes da inclusão na análise: A extenção de CPPE (para profundidades entre 0-4 m) poderia alcançar 275 km 2 a 76 m acima do nível do mar (nível de água atual), enquanto na cota de 82 m acima do nível do mar (nível de recheio final) a zona litorânea será aumentada em aproximadamente 21,5%. A área potencial para macróficas emersas foi calculada em 99 km 2 , para as plantas enraizadas com folhas flutuantes em 131 km 2 , e para as plantas enraizadas submersas em Rev. Brasil. Biol., 60(4)

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Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Prediction of colonization by macrophytes in the Yaciretá reservoir of the Paraná River (Argentina and Paraguay)

Neiff

Patiño

et al. 2000

Rev. Bras. Biol.

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“…Tundisi et al (1993) point out that the inhibition of the eutrophication process can be associated to phosphorous retention in the cascade of reservoirs above Itaipu, and studies accomplished by Nogueira et al (2005) (Paranepanema River) and Roberto et al (2009) (Paraná River) showed that there is a phosphorous decreasing in cascade reservoirs. In Itaipu Reservoir, the importance of impoundment in Porto Primavera dam could be observed in time scale, because this nutrient had a pronounced decline after 1998 when this reservoir was closed and started to exert major influences on limnological variables downstream.…”

Section: Discussionmentioning

confidence: 87%

Itaipu reservoir limnology: eutrophication degree and the horizontal distribution of its limnological variables

et al. 2011

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Reservoirs are manmade habitats, intermediate between rivers and lakes, presenting distinct hydrological and morphometric characteristics, with differential mean water residence time. They also present proper vertical and horizontal organisations, and their evolution depends on several variables acting on different special and temporal scales. The water quality evolution of the Itaipu Reservoir was evaluated through the analysis of the physical, chemical and biological variables, and by the application of Trophic State Indices. We concluded that the limnological variables present a horizontal pattern of variation highly dependent upon the hydrological regime. The turbidity and total suspended solids presented the same distribution pattern in the reservoir zones. The fluvial zone had the highest concentrations of nutrients, suspended solids and turbidity. The results of the Trophic State Indices indicate a mesotrophic level for the fluvial and transition zones, and an oligotrophic one for the lacustrine zone.Keywords: limnology, Itaipu reservoir, water quality, eutrophication, Brazil. Limnologia no reservatório de Itaipu: grau de eutrofização e distribuição horizontal de suas variáveis limnológicas ResumoOs reservatórios são ambientes artificiais e intermediários entre rios e lagos, apresentando características morfométricas e hidrológicas distintas, com alta taxa de renovação da água e organizações vertical e horizontal características. A evolução desses ecossistemas depende de variáveis que atuam em diferentes escalas espaciais e temporais. A evolução da qualidade da água do Reservatório de Itaipu foi avaliada por meio da análise das variáveis físicas, químicas e biológicas e da aplicação de índices de Estado Trófico. Observou-se que as variáveis limnológicas químicas e físicas apresentaram um padrão de variação espacial (horizontal) e temporal fortemente dependente do regime hidrológico. Os efeitos da turbidez e os sólidos suspensos totais apresentaram o mesmo padrão de distribuição por zona do reservatório. A zona fluvial foi a que apresentou as maiores concentrações de nutrientes, sólidos suspensos e turbidez. Os resultados dos Índices de Estado Trófico indicaram um estado de mesotrofia para as zonas fluvial e de transição e oligotrofia para a zona lacustre.Palavras-chave: limnologia, reservatório de Itaipu, qualidade da água, eutrofização, Brasil.

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“…spiroides may form large blooms during periods of long retention times and low turbulence in the Barra Bonita reservoir (27). These organisms produce considerable amount of EPS that is released into the medium in the form of colloids.…”

Section: Introductionmentioning

confidence: 99%

Activity of glycosidases from freshwater heterotrophic microorganisms on the degradation of extracellular polysaccharide produced by Anabaena spiroides (Cyanobacteria)

Colombo

Vieira

Moraes

2004

Braz. J. Microbiol.

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The activity of specific glycosidases during the degradation of the extracellular polysaccharide (EPS) produced by Anabaena spiroides was determined using MUF-substrates (MUF-monosaccharides). Polysaccharide degradation was found to occur in a two-phase process. The first consisted of high enzymatic activity that consumed 41% of the EPS at a relatively high rate, while the second consumed the remaining polysaccharide (59%) at a slower rate. A transition phase from the higher to the slower degradation rates was marked by a replacement of bacterial populations from coccoid to bacillus cells. During the degradation process, the bacterial biomass increased with the decrease of EPS, as revealed by bacterial cell counts.

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Limnology and management of reservoirs in Brazil

Cited by 79 publications

References 27 publications

Prediction of colonization by macrophytes in the Yaciretá reservoir of the Paraná River (Argentina and Paraguay)

Prediction of colonization by macrophytes in the Yaciretá reservoir of the Paraná River (Argentina and Paraguay)

Itaipu reservoir limnology: eutrophication degree and the horizontal distribution of its limnological variables

Activity of glycosidases from freshwater heterotrophic microorganisms on the degradation of extracellular polysaccharide produced by Anabaena spiroides (Cyanobacteria)

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