Phosphorus dynamics in the water of tropical semiarid reservoirs in a prolonged drought period

Cavalcante, Herika; Araújo, Fabiana; Becker, Vanessa

doi:10.1590/s2179-975x1617

Cited by 16 publications

(11 citation statements)

References 23 publications

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“…The TP concentration has showed a pattern of continuous increase from 2011 to 2017, from 34 µg.L -1 on February-2011 to 161 µg.L -1 on April-2016, while the reservoir volume decreased continuously, as the studied region faced a prolonged drought period (Wiegand et al 2020). Cavalcante et. al (2018) analyzed two semiarid reservoirs during drought period and observed the highest TP concentration values during the periods with lower depth.…”

Section: Impact Of the Drought Period In The Tp Concentration And Reservoir Volumementioning

confidence: 99%

“…This might suggest the influence of the low depth in this process. Cavalcante et. al (2018) also reported the highest observed TP concentration during periods with low depth.…”

Section: Impact Of the Drought Period In The Tp Concentration And Reservoir Volumementioning

confidence: 99%

“…Furthermore, the higher values of wet period load from 2017 highlight the importance of non-point sources of pollution for the waterbodies in semiarid regions. They are frequently the main external source of nutrients to reservoirs during the rainy period (Medeiros et al 2015;Cavalcante et al 2018).…”

Section: Impact Of the Drought Period In The Tp Concentration And Reservoir Volumementioning

confidence: 99%

“…However, the analysis carried out in an annual timestep in each reservoir for paired TP concentration comprised in the dry period showed that the great majority of the pairs presented a slightly higher TP concentration at the end of the dry period. This aspect might be a combined result of the volume reduction, which concentrates the nutrients, as well as an evidence of internal load (Nürnberg et al 2012;Cavalcante et al 2018).…”

Section: Tp Concentrations and Mass Balance Estimatesmentioning

confidence: 99%

“…The observed among-catchment variation of TP flux for the load of wet period can be largely explained by differentiated net anthropogenic P input as well as seasonal variations of water discharge in the rivers (Han et al 2018;Hu et al 2020). For the load of dry period it may depend on climatic conditions and the level of oxygenation in the water-sediment interface (Cavalcante et al 2018). Additionally, the existence of aquaculture is another relevant aspect, as it releases nutrients directly to the water column (Santos et al 2016).…”

Section: Tp Concentrations and Mass Balance Estimatesmentioning

confidence: 99%

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Phosphorus mass balance and input load estimation from the wet and dry periods in tropical semiarid reservoirs

MdJD¹,

Iel²

2021

Preprint

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The dynamics of total phosphorus (TP) in 18 strategic reservoirs of the high-density reservoir network of the Brazilian semiarid was evaluated during the wet and dry periods for the past 12 years. Seasonal TP concentrations presented no significant differences for about 90% of the reservoirs (p > 0.05). This was attributed to a trade-off between the hydrological/limnological processes occurring in the two seasons. Then, a transient complete-mix mass balance model was applied with particular adaptations for the tropical semiarid reservoirs to estimate the TP load for each season. Because of the relatively well mixed conditions and high hypolimnetic dissolved oxygen concentrations during the wet season, the wet load was assumed to represent the external TP load. On the other hand, because of the absence of reservoir inflow during the dry season, phosphorus release under anoxic sediment conditions and wind-induced resuspension under shallow water conditions, the dry load was assumed to reflect the internal TP load. The maximum external loads were related to peak inflows, notably after drought periods. Consistently, the largest internal loads were obtained during the drought periods, when the reservoirs were shallower and more prone to phosphorus release and resuspension. By comparing the impact of the two input load types, the wet period load was predominant in 72% of the reservoirs. The areal phosphorus loads ranged from 0.66 to 7.29 gP.m².yr-1, which were consistent with the literature, despite the very high density of reservoirs. Finally, power-law curves including data for all studied reservoirs were adjusted between the dry period load and volume, dry and wet period loads, wet period load and inflow, and total load and catchment area, resulting in satisfactory R² (0.66–0.82).

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Section: Impact Of the Drought Period In The Tp Concentration And Reservoir Volumementioning

confidence: 99%

“…This might suggest the influence of the low depth in this process. Cavalcante et. al (2018) also reported the highest observed TP concentration during periods with low depth.…”

Section: Impact Of the Drought Period In The Tp Concentration And Reservoir Volumementioning

confidence: 99%

Section: Impact Of the Drought Period In The Tp Concentration And Reservoir Volumementioning

confidence: 99%

Section: Tp Concentrations and Mass Balance Estimatesmentioning

confidence: 99%

Section: Tp Concentrations and Mass Balance Estimatesmentioning

confidence: 99%

See 3 more Smart Citations

Phosphorus mass balance and input load estimation from the wet and dry periods in tropical semiarid reservoirs

MdJD¹,

Iel²

2021

Preprint

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Prediction of total phosphorus in reservoir cascade systems

Goes,

Barros,

Neto

2023

Environ Monit Assess

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Abiotic factors driving cyanobacterial biomass and composition under perennial bloom conditions in tropical latitudes

et al. 2021

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While warming and eutrophication have increased the frequency and magnitude of harmful cyanobacterial blooms globally, the scenario for many eutrophic tropical freshwaters is a perennial year-round bloom. Yet, the drivers of persistent blooms are less understood when conditions such as light, temperature, and nutrients favor cyanobacteria growth year-round, and especially in regions facing recurrent periods of drought. In order to understand the drivers of cyanobacteria dominance, we assessed the abiotic conditions related to the abundance and dominance of the two dominant bloom-forming genera Raphidiopsis and Microcystis, in six shallow, man-made lakes located in the semiarid Northeastern region of Brazil during a prolonged regional drought. Lower water level corresponded to increased phosphorous and nitrogen concentration and, consequently, phytoplankton biomass. Cyanobacterial biomass was also proportional to phosphorus concentrations during year-round blooms. Yet, the two dominant cyanobacterial genera, Raphidiopsis and Microcystis, seldom co-occurred temporally and the switch between them was driven by water transparency. Our results illustrate the effects of drought induced water level reductions on the biomass and composition of cyanobacterial blooms in tropical shallow man-made lakes. Given the ideal year-round conditions (i.e., high light and temperature), droughts may be expected to intensify the risk and multitude of problems associated with eutrophication.

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Phosphorus dynamics in the water of tropical semiarid reservoirs in a prolonged drought period

Cited by 16 publications

References 23 publications

Phosphorus mass balance and input load estimation from the wet and dry periods in tropical semiarid reservoirs

Phosphorus mass balance and input load estimation from the wet and dry periods in tropical semiarid reservoirs

Prediction of total phosphorus in reservoir cascade systems

Abiotic factors driving cyanobacterial biomass and composition under perennial bloom conditions in tropical latitudes

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