Spatial distribution, bioavailability, and toxicity of metals in surface sediments of tropical reservoirs, Brazil

Frascareli, Daniele; Cardoso-Silva, Sheila; Mizael, Juliana de Oliveira Soares-Silva; Rosa, André Henrique; Pompêo, Marcelo Luiz Martins; López-Doval, Júlio C.; Moschini‐Carlos, Viviane

doi:10.1007/s10661-018-6515-8

Cited by 26 publications

(16 citation statements)

References 52 publications

(57 reference statements)

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“…Previous studies showed that the Itupararanga Reservoir faced a progressive deterioration in water quality in the last two decades (Beghelli, Pompêo, et al, ; Taniwaki et al, ). Based on the TSI, the reservoir was classified as oligotrophic in 2007, mesotrophic in 2008, supereutrophic in 2011, and eutrophic in 2018 (Frascareli et al, ; Rosa et al, ; Taniwaki et al, ). The average TSI in this study showed higher values at sites close to the main inflow (P1 and P2), where TSI ranged from 53.2 to 58.8.…”

Section: Discussionmentioning

confidence: 99%

Self‐Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs

Melo

Gontijo

Frascareli

et al. 2019

Water Resources Research

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Water quality in reservoirs is often compromised in many regions worldwide by nutrients and trace metals. This demands continuous monitoring; however, analyses of large data sets collected during regular monitoring remain a difficult task. Multivariate techniques offer a fast and robust approach for interpreting complex results. The objective of this study was to check the efficacy of selforganizing maps (SOMs) as a tool to investigate biogeochemical processes. This tool can also help to illustrate influences of land use patterns on the water quality of reservoirs. Here we use the Itupararanga Reservoir in Brazil as a subtropical example. Vertical profiles were sampled from seven sites in the reservoir in a total of seven campaigns over 24 months. Next to physicochemical parameters in the water column (dissolved oxygen, Eh, pH, and temperature), levels of nutrients (NO 3 − , NH 4 + , and PO 4 3− ), transition and trace metals (Al, Ba, Ca, Cr, Cu, Fe, K, Mg, Mn, Na, Ni, and Zn), and chlorophyll-a (Chla) were measured. These variables were correlated with land use using SOM. With this technique samples were classified into 17 distinct groups that showed distinct influences of spatial heterogeneity and seasonality. The analyses helped to reveal a seasonal stratification period, where Fe, Mn, and P were released from sediments. Nutrients and some metal inputs (Al and Fe) were related to agricultural, urban, and grass/pasture areas around the reservoir. Our approach also helped to explain physical and biogeochemical seasonality in the reservoir.

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Section: Discussionmentioning

confidence: 99%

Self‐Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs

Melo

Gontijo

Frascareli

et al. 2019

Water Resources Research

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“…1 Paiva Castro Reservoir and sediment sampling sites (1-9, surface sediment; C, core sites). The sampling sites were georeferenced using a Garmin Model 72 GPS, according to the UTM coordinate system, datum SAD69, and central meridian 45°00 (based on Frascareli et al 2018) Initial Concentration) model was used for the calculating dates and sedimentation rate calculations (Robbins and Edgington 1975).…”

Section: Laboratory Analysesmentioning

confidence: 99%

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

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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.

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“…The main channel has a length of about 26 km. The water residence time varies between 95 and 270 days and the reservoir has a maximum storage volume of 286 million m 3 41 , 58 . The most important contributing streams are the Sorocabaçu, Sorocamirim and Una rivers next to numerous small streams (e.g.…”

Section: Methodsmentioning

confidence: 99%

“…Another important source of nutrients is sewage discharge from urban areas. They mainly reach the reservoir untreated at the entrance 39,41 . These inputs can stimulate primary production and may also cause eutrophication.…”

mentioning

confidence: 99%

Dominance of in situ produced particulate organic carbon in a subtropical reservoir inferred from carbon stable isotopes

Bueno

Frascareli

Gontijo

et al. 2020

Sci Rep

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Sources of particulate organic carbon (poc) play important roles in aqueous carbon cycling because internal production can provide labile material that can easily be turned into CO 2. On the other hand, more recalcitrant external POC inputs can cause increased loads to sedimentary organic matter that may ultimately cause cH 4 release. In order to differentiate sources, stable isotopes offer a useful tool. We present a study on the Itupararanga Reservoir (Brazil) where origins of POC were explored by comparing its isotope ratios (δ 13 c poc) to those of dissolved inorganic carbon (δ 13 c Dic). The δ 13 c poc averaged around − 25.1‰ in near-surface waters, which indicates higher primary production inferred from a fractionation model that takes into account carbon transfer with a combined evaluation of δ 13 c POC, δ 13 c Dic and aqueous co 2. However, δ 13 c poc values for water depths from 3 to 15 m decreased to − 35.6‰ and indicated different carbon sources. Accordingly, the δ 13 c Dic values of the reservoir averaged around + 0.6‰ in the top 3 m of the water column. This indicates CO 2 degassing and photosynthesis. Below this depth, DIC isotope values of as low as − 10.1‰ showed stronger influences of respiration. A fractionation model with both isotope parameters revealed that 24% of the POC in the reservoir originated from detritus outside the reservoir and 76% of it was produced internally by aqueous co 2 fixation. Reservoirs and their tributaries are active components of landscapes. They receive, transport, process and store inorganic and organic carbon 1. Although lakes and reservoirs cover only 2.2% of the global continental area, they may play so far poorly accounted roles in cycling continental carbon 2-4. In addition, regional investigations of carbon budgets become increasingly important for managing water resources because they define ecosystem functions and services 5-8. Spatiotemporal changes of physicochemical and biological parameters in subtropical reservoirs, can increase our knowledge of carbon turnover in water bodies. For instance, excessive precipitation, can increase terrestrial nutrients, contaminants, soil leaching and additions of untreated sewage input 9. Rainfall events can also cause near-surface turbulences in lakes that has been shown to enhance gas exchange by increasing transfer velocities of CO 2 10,11. Precipitation can also lead to increased input from external sources (i.e. allochthonous matter for instance from plant debris or soils) that may become trapped in lakes and reservoirs. This can, in turn, change biogeochemical dynamics of the water column 12. Such processes include carbon uptake and release of carbon within the water column that may also be controlled by seasonal changes of temperature, weather patterns or light availability. These may in turn have important influences on carbon fluxes inside open water bodies such as for instance sedimentation, or gross primary production, ecosystem respiration and external carbon inputs 13. For the latter, reservoir catchments ma...

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Spatial distribution, bioavailability, and toxicity of metals in surface sediments of tropical reservoirs, Brazil

Cited by 26 publications

References 52 publications

Self‐Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs

Self‐Organizing Maps for Evaluation of Biogeochemical Processes and Temporal Variations in Water Quality of Subtropical Reservoirs

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

Dominance of in situ produced particulate organic carbon in a subtropical reservoir inferred from carbon stable isotopes

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