Environmental gradient in reservoirs of the medium and low Tietê River: limnological differences through the habitat sequence

Smith, Welber Senteio; Espíndola, E. L. G.; Rocha, Odete

doi:10.1590/s2179-975x2014000100009

Cited by 47 publications

(57 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The macrophyte species composition in the Tietê River Basin Cavenaghi et al, 2003;Martins et al, 2008;Smith et al, 2014;Tanaka et al, 2002) is similar to those found in the Itupararaga Reservoir. In this ecosystem, there was a predominance of emergent species (Polygonum lapathifolium, Althernanthera philoxeroides, Eichhornia azurea) and others such as Myriophyllum aquaticum, Pistia stratiotes, Eichhornia crassipes and Salvinia, Hymenachne, Ludwigia, Cyperus and the Nymphaea genus.…”

Section: Discussionsupporting

confidence: 67%

“…In the laboratory, the macrophytes were washed to remove the coarse material, separated by species and dried (60 °C) to a constant weight (Pompêo & Moschini-Carlos, 2003) to obtain the dried biomass (g DW.m -2 ). Macrophyte species identification was performed using specific literature (Amaral et al, 2008;Pott & Pott, 2000;Scremin-Dias, 1999) The water temperature, pH, electrical conductivity and concentrations of dissolved oxygen (DO) were measured in the sampling sites using a probe (YSI, 556). The rainfall and water flow data of the reservoir during the sampling period was provided by the dam operator.…”

Section: Sampling and Plant Identificationmentioning

confidence: 99%

See 1 more Smart Citation

Richness and distribution of aquatic macrophytes in a subtropical reservoir in São Paulo, Brazil

et al. 2017

View full text Add to dashboard Cite

Aims: to evaluate the richness, biomass and distribution of aquatic macrophytes in a subtropical reservoir in the dry and rainy seasons. Methods: this study was carried out in the Itupararanga Reservoir, an important water source in São Paulo State, undergoing a continuous process of eutrophication. Samples of macrophytes were collected at 12 sampling sites in the summer and at 9 sampling sites in the winter in the Itupararanga Reservoir using the quadrat method (0.25 m 2 ). In the laboratory, the plants were washed to remove the coarse material and then were dried (60 °C) for biomass determination (gDW. m -2). All the species in the sampling sites in both periods were identified using the specific literature. In each sampling site, the water temperature, pH, electrical conductivity and dissolved oxygen were measured using a probe. The temporal and spatial differences were analyzed using t-test and a Cluster Analysis was performed. Results: The checklist showed sixteen species, 75% of them were emergent. From the 16 species, 15 were present in the summer and 10 in the winter. Eichhornia crassipes, Polygonum sp., and Urochloa sp. were the frequent taxa and had the highest biomass in both periods. The winter showed the highest biomass mainly due to the growth of free-floating species. The headwaters of the reservoir, the most eutrophic region, showed that the highest macrophyte richness and the sampling sites of this area were clustered in both the summer and winter. Conclusions: There was no significant spatial variation among the measured variables. E. crassipes, Salvinia sp. and Urochloa sp. showed a significant variation of biomass between two periods. Urochloa sp. is a nuisance species occurring in up to 60% of the sampling sites having implications for the whole catchment. Continuous macrophyte monitoring is important due to the increasing trophic status of this ecosystem.

show abstract

Section: Discussionsupporting

confidence: 67%

Section: Sampling and Plant Identificationmentioning

confidence: 99%

Richness and distribution of aquatic macrophytes in a subtropical reservoir in São Paulo, Brazil

et al. 2017

View full text Add to dashboard Cite

show abstract

“…In another study concerning spatial variation in a cascade system of six reservoirs located along the Tietê River (São Paulo State, Brazil), Rodgher et al (2005) and Smith et al (2014) observed that TN and TP showed the same patterns of variation in water and sediment, as suggested by the CRCC (Barbosa et al 1999). The patterns were similar to those observed in the present study.…”

Section: Resultsmentioning

confidence: 86%

Nitrogen and phosphorus in cascade multi-system tropical reservoirs: water and sediment

Pompêo¹,

Moschini‐Carlos

López-Doval³

et al. 2017

Limnological Review

View full text Add to dashboard Cite

Abstract:The aim of this research was to analyze the horizontal spatial heterogeneity of both water and superficial sediment quality among and within the reservoirs of the Cantareira System (CS), focusing on concentrations of N and P, attributed to the dumping of raw domestic sewage into water bodies, which is the main cause of water pollution in São Paulo State (Brazil). The CS is a multi-system complex composed of five interconnected reservoirs, with water transported by gravity through 48 km of tunnels and channels. From the last reservoir of the CS, with an output of 33 m 3 s -1, the water is conducted to a water treatment plant, producing half of the water consumed by 19 million people inhabiting São Paulo city. The upstream reservoirs are more eutrophic than the downstream ones. Data also suggest that the low phytoplankton biomass (ranging from 0.9 to 14.4 µg dm ). For water, the DIN/TP ratios values range from 19 to 380. The upstream reservoirs function as nutrient accumulators and the sediment is the main compartment in which P and N are stored. Although the reservoirs are located in different river basins and are not in sequence along the same river, the results suggest a marked gradient between the reservoirs, with features similar to those of cascade reservoirs. The large volumes flowing through the canals and tunnels could explain the observed pattern. The CS reservoirs can therefore be considered multi-system reservoirs in cascade, constituting a particular case of multi-system reservoirs.

show abstract

“…The increasing number of reservoirs shows their important role for human populations, such as power generation, supply and recreation (Tundisi & Matsumura-Tundisi, 2003). Their imposition on natural systems, however, causes significant modifications of hydrology, morphology and riverine habitats, changes which have been well documented (Smith et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Climate factors and limnological conditions shaping phytoplankton community in two subtropical cascading reservoirs

et al. 2017

View full text Add to dashboard Cite

Cite as: Cassol, A.P.V. et al. Climate factors and limnological conditions shaping phytoplankton community in two subtropical cascading reservoirs. Acta Limnologica Brasiliensia, 2017, vol. 29, e17. Abstract: Aim: A series of dams along the course of a river forms a complex cascading reservoir system. The interconnectivity of the dams is perceived with the reduction of turbidity and phosphorus and the increase of specific richness throughout the system. Designing a management system that promotes the integration of biotic and abiotic data is essential to these resources of recognized importance for the population, the country's power generation and watersheds management. The Jacuí River is an important water resource in the state of Rio Grande do Sul, along its upper course, five water reservoirs comprise a cascade system tapped for energy generation and agriculture, but the effects on the phytoplankton community of cascading dams are still unknown. Thus, the present study aimed to investigate spatial and temporal patterns of phytoplankton associated with climatological and limnological characteristics of the Ernestina and Itaúba water reservoirs, located in the upper Jacuí River, RS, Brazil. Methods: Sampling campaigns were carried out seasonally from January 2012 to February 2013, with four sampling stations within each dam and at three different depths. The sampling units were determined according to the three zones of the reservoir: river areas, transition and lake. Results: A total of 91 phytoplankton species were identified in Ernestina and 130 in Itaúba. There was no significant difference between vertical and horizontal patterns, since the community responded to seasonal changes and the specific characteristics of each dam. Conclusions: The specific richness and water transparency increased downstream of the system and changes in water retention time were important for cell density and composition.Keywords: Plankton; seasonality; ecological dynamics; retention time.Resumo: Objetivo: Uma série de represas ao longo do curso de um rio formam o complexo sistema em cascata de reservatórios. A interconectividade dessas represas são percebidas com a redução da turbidez e fósforo e aumento da riqueza de espécie ao longo do sistema. Além disso, cada reservatório possui suas características, bióticas e abióticas, que devem ser avaliadas e utilizadas como instrumento na elaboração de propostas de manejo contínuo das bacias hidrográficas. O rio Jacuí, com cinco represas inseridas ao longo do seu curso superior, é um importante recurso hídrico do estado do RS, explorado para geração de energia e agricultura, no entanto seus efeitos na comunidade fitoplanctônica das represas construídas em cascata ainda é desconhecido. Dessa forma o presente estudo teve como objetivo investigar padrões espaciais e temporais do fitoplâncton associadas às características climatológicas e 2 Cassol, A.P.V. et al.

show abstract

Environmental gradient in reservoirs of the medium and low Tietê River: limnological differences through the habitat sequence

Cited by 47 publications

References 24 publications

Richness and distribution of aquatic macrophytes in a subtropical reservoir in São Paulo, Brazil

Richness and distribution of aquatic macrophytes in a subtropical reservoir in São Paulo, Brazil

Nitrogen and phosphorus in cascade multi-system tropical reservoirs: water and sediment

Climate factors and limnological conditions shaping phytoplankton community in two subtropical cascading reservoirs

Contact Info

Product

Resources

About