Revisiting the concept of longitudinal gradients in reservoirs

Carneiro, Fernanda Melo; Bini, Luis Maurício

doi:10.1590/s2179-975x1319

Cited by 10 publications

(5 citation statements)

References 29 publications

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“…Species richness and abundance plays a key role in understanding biodiversity, generating important information on conservation and maintenance of ecosystem functions, since the construction of reservoirs influences aquatic biodiversity (Nilsson et al, 2005). In addition, reservoirs are increasingly common and understanding the functioning of these aquatic ecosystems is essential to establish monitoring strategies and use priorities, especially for the important ecosystem services they provide, such as water supply, food, hydroelectricity, irrigation, recreation, navigation, among others (Tundisi et al, 2008;Carneiro & Bini, 2020).…”

Section: Discussionmentioning

confidence: 99%

Phytoplankton richness and abundance in response to seasonality and spatiality in a tropical reservoir

et al. 2021

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Aim Species richness and abundance are important elements in understanding communities’ dynamics. In this way we evaluated the spatial and temporal variation of phytoplankton richness and density in a tropical reservoir, and its main drivers. We tested whether the temporal variability of the hydrological cycle influences the phytoplankton, in addition to testing the main environmental variables that influence richness and density. Methods Data from environmental variables and phytoplankton were sampled in different regions of João Leite reservoir, Goiás, Brazil, during a dry and rainy period, and were analyzed by Principal Component Analysis, Student's t-test and Bioenv. Results We recorded distinct environmental scenarios between the dry and rainy period, with temporal differences in richness. Sixty-two taxa were recorded, with cyanobacterial predominance in both hydrological periods and in the lentic reservoir regions. Water temperature, pH, electrical conductivity, dissolved oxygen, turbidity, and nutrient concentrations were the main drivers of phytoplankton richness and density in our study. Conclusions The richness and abundance of species directly reflect the determining factors in the structure of communities, generating important information about ecosystem functions. Therefore, understanding the environmental variability on phytoplankton richness and abundance in tropical reservoirs is essential, since the construction of reservoirs influences aquatic biodiversity and the provision of ecosystem services.

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Section: Discussionmentioning

confidence: 99%

Phytoplankton richness and abundance in response to seasonality and spatiality in a tropical reservoir

et al. 2021

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“…Because of the differing spatial effects of dams (Agostinho et al, 2007, 2016), the river reach studied was spatially divided into three sections that were each sampled during every visit: UPRIVER, located upriver of the hydroelectric reservoir; RESERVOIR, located in the reservoir; and DOWNRIVER, located downriver of the hydroelectric dam. We chose not to evaluate the longitudinal gradient in the RESERVOIR section, because the run‐of‐river Baguari Reservoir has very little slope, low water residence time, and little increment in sedimentation rates or water transparency (Carneiro & Bini, 2020; Thornton et al, 1981).…”

Section: Methodsmentioning

confidence: 99%

Influences of multiple anthropogenic disturbances coupled with a tailings dam rupture on spatiotemporal variation in fish assemblages of a tropical river

et al. 2022

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The Mariana disaster, resulting from the rupture of the Fundão tailings storage facility (TSF) in 2015, was a large‐scale environmental disaster that drastically affected the entire channel of the Rio Doce, southeastern Brazil. The disaster produced substantial channel siltation, increased turbidity, riparian damage and a massive fish kill. However, the Rio Doce basin has a long history of environmental degradation, including hydroelectric dams. The latter are major threats to the ichthyofauna because they affect flow regimes, trap sediments and large wood, select generalist species, impair fish migrations and favour non‐native invasive species. In this study, we analysed the effects of the rupture as well as impacts from the construction of a run‐of‐the‐river hydroelectric dam on native and non‐native fish abundances, and species richness and composition in the middle Rio Doce. To do this, we examined fish survey data collected before and after each disturbance upriver of the reservoir, in the reservoir area and downriver of the dam. The data were separated into three temporal intervals: free‐flowing river, post‐filling reservoir and post‐TSF disaster. To assess temporal changes in native and non‐native fish species richness, we used a rarefaction method and tested it with two‐way ANOVA, which also was used to compare fish abundances. To test temporal changes in fish assemblage composition we used a PERMANOVA test. We observed no significant differences in total native or non‐native species richness as a result of the dam or the disaster. However, we did observe increased non‐native individual abundances after the TSF rupture as well as native individual abundances, depending on the location studied. The assemblage composition also changed after dam construction and the TSF rupture, except for the upriver reach after dam construction. We conclude that both the dam and the TSF rupture affected fish assemblages, favouring increased non‐native abundances, and also changed fish assemblage composition. Our results suggest that a century of landscape and riverscape pressures had extirpated the sensitive fishes from the Rio Doce before the TSF rupture. We conclude that multiple long‐term chronic disturbances can be as harmful to aquatic biota as the acute effects of a major environmental disaster.

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“…In heterogeneous artificial reservoirs, the classes of Chlorophyceae and Cyanophyceae were also more abundant. The authors of this work call attention to the high degree of dependence on the environmental context to justify the differences found in the limnological variables in tropical reservoirs 17 . Thus, the importance of a specific look at the characteristics of each water body is highlighted, depending on its use.…”

Section: Phytoplanktonmentioning

confidence: 99%

Limnological Processes of Facultative Stabilization Lagoons in the Treatment of Liquid Effluents

Matias

Costal

Hayashi

et al. 2020

EVS

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Objective: To evaluate some of the main limnological aspects and discuss the relevance of effluent treatment efficacy by the FLs treatment system and provide fundamental information for technicians and environmental managers to make decisions about this type of treatment. Methods: The literature review was used as a methodology, specifically through scientific publications from 2016 to June 2020 on FL and limnology, applied in tropical climates. We selected articles written in Portuguese and English, and we chose to search in free terms, thus promoting a greater number of references on FLs and limnology. Results: The research showed the potential of FLs for the treatment of effluents and their contribution to sustainability. To this end, we show in this article the relevance of the environmental dynamics of FLs, contemplating characteristics related to their aerobic, anerobic, facultative processes, in addition to operational and limnological variables, such as the types of phytoplankton, effectiveness in removing nutrients and contributing to the landscape harmony and biodiversity conservation. We also emphasize that this is fundamental information for the operation and management of FLs. Conclusions: FLs, owing to their operational and limnological characteristics, are a type of favorable effluent treatment system in tropical climates as occurs in Brazil. Investment in this type of system can be favorable to the sustainability and harmony of the landscape, in addition to the fact that the limnological behavior of these ecosystems is favorable to the removal of nutrients, which in turn contributes to environmental conservation and pollution reduction.

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Revisiting the concept of longitudinal gradients in reservoirs

Cited by 10 publications

References 29 publications

Phytoplankton richness and abundance in response to seasonality and spatiality in a tropical reservoir

Phytoplankton richness and abundance in response to seasonality and spatiality in a tropical reservoir

Influences of multiple anthropogenic disturbances coupled with a tailings dam rupture on spatiotemporal variation in fish assemblages of a tropical river

Limnological Processes of Facultative Stabilization Lagoons in the Treatment of Liquid Effluents

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