The reduction in water volume favors filamentous cyanobacteria and heterocyst production in semiarid tropical reservoirs without the influence of the N:P ratio

Mendes, Camila Ferreira; Severiano, Juliana dos Santos; Moura, Gustavo Correia de; Silva, Ranielle Daiana dos Santos; Monteiro, Flávia Morgana; Barbosa, José Etham de Lucena

doi:10.1016/j.scitotenv.2021.151584

Cited by 11 publications

(3 citation statements)

References 56 publications

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“…Our results also showed that the water level in the reservoir was lowest during the summer season due to increasing temperatures, increasing evaporation, and increased demand for human consumption. Many studies have shown that water depth affects the physicochemical composition of the water as well as the release of nutrients from the sediment and favors the growth of certain bacteria 76 – 79 .…”

Section: Discussionmentioning

confidence: 99%

“…Moreover, the optimal median water temperature of 26.85 °C recorded in January bolsters their metabolic activities, accelerating growth and proliferation. Additionally, the reduction in water depth during the dry season presumably enhances light penetration, a boon for the photosynthesis-dependent cyanobacteria 79 . The consistent dissolved oxygen (DO) levels observed by the study imply that oxygen availability was not a constraining factor, and the photosynthetic activity of cyanobacteria could have contributed to maintaining these stable DO concentrations 87 .…”

Section: Discussionmentioning

confidence: 99%

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Temporal patterns of bacterial communities in the Billings Reservoir system

Marcondes,

Pessôa,

José da Silva Duarte

et al. 2024

Sci Rep

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In this study, high-throughput sequencing of 16S rRNA amplicons and predictive PICRUSt functional profiles were used to perform a comprehensive analysis of the temporal bacterial distribution and metabolic functions of 19 bimonthly samples collected from July 2019 to January 2020 in the surface water of Billings Reservoir, São Paulo. The results revealed that most of the bacterial 16S rRNA gene sequences belonged to Cyanobacteria and Proteobacteria, which accounted for more than 58% of the total bacterial abundance. Species richness and evenness indices were highest in surface water from summer samples (January 2020), followed by winter (July 2019) and spring samples (September and November 2019). Results also showed that the highest concentrations of sulfate (SO4–2), phosphate (P), ammonia (NH3), and nitrate (NO3-) were detected in November 2019 and January 2020 compared with samples collected in July and September 2019 (P < 0.05). Principal component analysis suggests that physicochemical factors such as pH, DO, temperature, and NH3 are the most important environmental factors influencing spatial and temporal variations in the community structure of bacterioplankton. At the genus level, 18.3% and 9.9% of OTUs in the July and September 2019 samples, respectively, were assigned to Planktothrix, while 14.4% and 20% of OTUs in the November 2019 and January 2020 samples, respectively, were assigned to Microcystis. In addition, PICRUSt metabolic analysis revealed increasing enrichment of genes in surface water associated with multiple metabolic processes rather than a single regulatory mechanism. This is the first study to examine the temporal dynamics of bacterioplankton and its function in Billings Reservoir during the winter, spring, and summer seasons. The study provides comprehensive reference information on the effects of an artificial habitat on the bacterioplankton community that can be used to interpret the results of studies to evaluate and set appropriate treatment targets.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Temporal patterns of bacterial communities in the Billings Reservoir system

Marcondes,

Pessôa,

José da Silva Duarte

et al. 2024

Sci Rep

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“…Phosphorus and nitrogen are widely acknowledged as key nutrients with a significant impact on water quality, particularly with regard to phytoplankton growth and chlorophyll a (Chla) concentration in lakes (Shuvo et al, 2021;Mendes et al, 2022). Among these nutrients, total phosphorus (TP) is generally recognized as the primary limiting factor for phytoplankton growth and Chla concentration.…”

Section: Introductionmentioning

confidence: 99%

Analysis of total phosphorus and chlorophyll a correlations in Ceará reservoirs, Brazil

Guimarães

Neto

2023

Rev. Bras. Ciênc. Ambient.

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Reservoirs worldwide are prone to water quality degradation caused by increased primary production. Therefore, it is essential to comprehend the factors that influence this phenomenon as it plays a fundamental role in controlling eutrophication. The aim of this study was to analyze the correlation between total phosphorus (TP) and chlorophyll a (Chla) in 155 reservoirs located in the state of Ceará, Brazil. This analysis was conducted through a comprehensive examination of historical data (2008–2021) obtained from the water resource management company of the state, which monitors these parameters. The correlation between TP and Chla was examined through simple adjustments, utilizing the coefficient of determination (R²) as an evaluation metric. Afterward, the study investigated the potential influences on the dynamics of these adjustments based on factors such as the hydrographic basin, reservoir size, trophic state (as for Chla and TP concentrations), and the volumetric variability coefficient. In general, the adjustments yielded unsatisfactory models (R² < 0.4) for the majority of reservoirs (n = 115). Despite their inadequacy, these models align with classic literature models, indicating that in most basins, higher availability of TP in the water column contributes to increased Chla concentration. The analysis of factors influencing the pattern and dispersion of adjustments between Chla and TP revealed that the performance of R² is associated with various factors, such as different watersheds, volumetric variability, and Chla concentrations. The variance in R² between reservoirs of varying sizes and trophic states based on TP concentration was considered insignificant.

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