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

Pompêo, Marcelo Luiz Martins; Moschini‐Carlos, Viviane; López-Doval, Júlio C.; Abdalla-Martins, Natália; Cardoso-Silva, Sheila; Freire, Rogério Herlon Furtado; Beghelli, Frederico Guilherme de Souza; Brandimarte, Ana Lúcia; Rosa, André Henrique; López, Pilar

doi:10.1515/limre-2017-0013

Cited by 10 publications

(3 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Different from the findings of Pompêo et al (2017), the N/P ratio of 0.5 ± 0.9 (Table 1) suggests that nitrogen is the limiting element. For aquatic ecosystems, N/P > 16 generally indicates that phosphorus is the limiting nutrient, whereas N/P < 14 indicates nitrogen limitation (Elser et al 2009).…”

Section: C/n C/p and N/p Molar Ratioscontrasting

confidence: 95%

Factors that control the spatial and temporal distributions of phosphorus, nitrogen, and carbon in the sediments of a tropical reservoir

Cardoso-Silva

Ferreira

Figueira

et al. 2018

Environ Sci Pollut Res

Self Cite

View full text Add to dashboard Cite

The impacts of anthropic activities have had profound effects on the nitrogen (N) and phosphorus (P) cycles in many aquatic ecosystems. We investigated the spatial and temporal distributions of carbon (C), N, and P in the sediments of a tropical Paiva Castro Reservoir (São Paulo, Brazil), as well as their release and retention in the system. In 2010, surface sediments were collected at nine sites in the reservoir, and a core was obtained in the limnetic zone, in 2010. The core was dated using the Pb technique. The organic C content was estimated from organic matter concentration, which was measured by the loss-on-ignition method, and the concentrations of P and N were determined by spectrophotometry. Marked spatial heterogeneity in the Paiva Castro sediments associated with both natural variations in the water body and variations induced by human impacts was observed. Heterogeneity was evidenced by a decrease in the allochthonous contribution of organic matter (C/N) in the upstream-downstream direction and increases of N and P, mainly associated with water flows in the different compartments of the reservoir. In the core, C and N concentrations display significant positive correlations with increases in population and agricultural activities in the drainage basin through time. The C/P molar ratios in surface sediments are indicative of human impacts in the region, as C:P ratios in the sediment are low (7.8:1) compared to the Redfield ratio (C:P = 108:1). Predominance of oxic conditions at the sediment surface and particles sizes< 63 μm provided favorable conditions for P retention in the sediments, which helps prevent eutrophication. Approaches used in this research should be extended to other locations, especially in mesotrophic and oligotrophic reservoirs, to provide information on historical impacts in such aquatic ecosystems.

show abstract

Section: C/n C/p and N/p Molar Ratioscontrasting

confidence: 95%

Factors that control the spatial and temporal distributions of phosphorus, nitrogen, and carbon in the sediments of a tropical reservoir

Cardoso-Silva

Ferreira

Figueira

et al. 2018

Environ Sci Pollut Res

Self Cite

View full text Add to dashboard Cite

show abstract

“…Wiegand et al, 2021; Guimarães and Lima Neto, 2023). On the other hand, only a slight variation of up to about ±30% in the mean values of water quality parameters were observed among the reservoirs, especially for the last three (R3-R5), contrasting with previous studies in non-semiarid reservoirs, in which a signi cant improvement in water quality was noted along the cascade(Pompêo et al, 2017;Soares and Calijuri, 2022). This was attributed to the low water residence time (< 5 days throughout the cascade) and, consequently, to the low capacity of pollutant removal along the man-made Integration channel (IC),…”

contrasting

confidence: 92%

Prediction of total phosphorus in reservoir cascade systems

Goes,

Barros,

Neto

2023

Environ Monit Assess

View full text Add to dashboard Cite

Reservoir cascades have attracted the attention of scientists worldwide. The present study investigates the cascade of ve reservoirs (R1, R2, R3, R4 and R5) along a 192 km water channel system located in the State of Ceará, in the Brazilian semiarid region. This cascade system was implemented in 2012 to promote water availability and security to the capital of Ceará and the strategic industry and port complex of the region. However, these reservoirs have faced a progressive degradation of water quality, which has resulted in intense eutrophication and high water treatment costs. The study evaluates the dynamics of water quality from 2013 to 2021 along this reservoir cascade (from R1 to R5). The results revealed that water quality did not improve along the cascade system, differently from previous studies on reservoirs interconnected by natural rivers. This was attributed to the low water residence time and low capacity of pollutant removal along the man-made water channel system, as well as to the high internal phosphorus loads of the reservoirs. Multiple regression models involving the explanatory variables of total phosphorus, total nitrogen, chlorophyll-a, cyanobacteria, transparency, rainfall and volume from upstream reservoirs were obtained to determine total phosphorus concentration in downstream reservoirs, considering different combinations of reservoir pairs in the cascade and different time delays.A clear trend of R 2 decline with the distance between the upstream and downstream reservoirs was observed. For example, the R 2 -values for the correlations adjusted between R1 and R2 (48 km), R1 and R3 (172 km), R1 and R4 (178 km), and R1 and R5 (192 km) were 0.66, 0.32, 0.22, and 0.12, respectively. On the other hand, the adoption of time delays of the order of the cumulative residence times of the reservoirs promoted a signi cant improvement in the R 2 -values. For instance, the best correlation adjusted between R1 and R5 improved from R 2 = 0.12 to 0.69 by considering a time delay of 21 months. This suggests that previous data from upstream reservoirs can be used to predict current and future total phosphorus concentration in downstream reservoirs. The results from this study are important to better understand the spatiotemporal dynamics of water quality in reservoir cascade systems and thus improve water resources management, especially in drylands.

show abstract

“…Located in São Paulo State, southeast Brazil, between the coordinates 22º53'20"S and 46º24'49"W (Figure 1), the Jaguari-Jacareí Reservoir comprises two reservoirs, the Jaguari and the Jacareí, connected through a canal with width of 25m and length of 130m, forming one water body. Altogether the reservoir has a drainage area of 1.252 km 2 , volume of 808 hm 3 (Sperling, 1999), maximum depth of 50 m (ANA, 2015), and water residence time of 368.5 days (Pompêo et al, 2017). The climate in the region is characterized as tropical, with dry and wet seasons, the average temperature for the hottest month is above 22 ºC and for the coldest month is below 18 °C, while average annual rainfall is c. 1400 mm (Miranda et al, 2009).…”

Section: Study Areamentioning

confidence: 99%

Water quality and spatial and seasonal dynamics in the largest water supply reservoir in Brazil and implications for diatom assemblages

2021

View full text Add to dashboard Cite

Aim in this paper we investigated how spatial factors and seasonal dynamics influenced the diatom community in a tropical deep environment of low productivity waters in Brazil. Methods we used physical and chemical characteristics of the water and planktonic diatoms from 9 sampling stations during dry (austral winter) and wet (austral summer) seasons (N = 18) as the outline to identify water quality, spatial and seasonal patterns. To evaluate spatially and temporally integrated events from the recent past (approximately the last 5 years before sampling), and the species from diverse habitats of the system, we used diatoms from the surface sediment (top 2 cm, N = 9). Since we used the top 2 cm of surface sediment containing the dead diatoms that were deposited over recent past of the reservoir, seasonal sampling of the sediment was not needed. Results during the dry season heavily silicified long colonial planktonic diatom species associated mainly with higher mixing depth, pH, and transparency dominated the plankton, whereas in the wet season the reservoir became stratified, favoring planktonic solitary diatoms with high surface volume ratios. For the sediment, a general pattern emerged where planktonic species dominated in the deep sections of the reservoir, and the abundance of benthic species in shallow areas near the tributaries increased. Conclusions the diatom assemblages was mainly influenced by seasonal variations and mixing regime. Surface sediment samples provided longer-term information, and revealed habitat differentiation shaping diatom assemblages. Overall, the small centric planktonic Aulacoseira tenella (Nygaard) Simonsen stood out as the most abundant species in the entire reservoir in both, the plankton and the sediment, indicating that size and shape serve as adaptive strategies for buoyancy and nutrient uptake stand as a competitive advantage in deep low productivity environments.

show abstract

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

Cited by 10 publications

References 40 publications

Factors that control the spatial and temporal distributions of phosphorus, nitrogen, and carbon in the sediments of a tropical reservoir

Factors that control the spatial and temporal distributions of phosphorus, nitrogen, and carbon in the sediments of a tropical reservoir

Prediction of total phosphorus in reservoir cascade systems

Water quality and spatial and seasonal dynamics in the largest water supply reservoir in Brazil and implications for diatom assemblages

Contact Info

Product

Resources

About