Influence of limnological zones on the spatial distribution of fish assemblages in three Brazilian reservoirs

Becker, Barbara J.; Galhardo, Bárbara de Oliveira Sanches; Macedo, Diego Rodrigues; Hughes, Robert M.; Callisto, Marcos; Santos, Gilmar B.

doi:10.4081/jlimnol.2015.1266

Cited by 7 publications

(6 citation statements)

References 52 publications

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“…The results of this study indicated that longitudinal gradients in tropical reservoirs are not as ubiquitous as previously thought (see also Bernot et al, 2004;Borges et al, 2008;Becker et al, 2016). They also indicated that the strengths of these gradients were not easily predictable.…”

Section: Discussionsupporting

confidence: 50%

Revisiting the concept of longitudinal gradients in reservoirs

Carneiro

Bini

2020

Acta Limnol. Bras.

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Aim Reservoirs are an increasingly common type of aquatic ecosystem in countries where hydropower is a dominant energy source. Understanding the functioning of these systems is essential to establish monitoring strategies or priorities for their use. The main goal of this study was to test for the presence of longitudinal gradients in reservoirs. Methods We gathered data along the main axes of 17 tropical reservoirs to test the relationship between different ecological indicators (e.g., turbidity, nutrient concentrations, and phytoplankton abundance) and distance to the dam. After, we tested whether the strengths of longitudinal gradients were related to a set of explanatory variables (occurrence in a reservoir cascade, presence of tributaries near the dam, land-use, morphology and reservoir age). Results We did not find significant relationships between our set of ecological indicators and distance to the dam and the strengths of these relationships were not consistently predicted by the explanatory variables. However, different indicators suggested patterns consistent with expectations. Conclusion The distance to the dam is not a consistent predictor of the spatial variation of different limnological variables in tropical reservoirs, highlighting a high degree of context-dependency.

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Section: Discussionsupporting

confidence: 50%

Revisiting the concept of longitudinal gradients in reservoirs

Carneiro

Bini

2020

Acta Limnol. Bras.

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“…A consequência é a criação de gradientes descontínuos ao longo do rio, ameaçando a persistência e estabilidade de comunidades de peixes e outros organismos (Penczak & Kruk 2005). Desta forma são observados efeitos na composição e abundância de espécies, com proliferação daquelas de maior plasticidade trófica e reprodutiva e eliminação das mais sensíveis, incluindo as reofílicas e migradoras (Agostinho et al 2016, Becker et al 2016, Sanches et al 2016. A presença de reservatórios em cascata (Petesse et al 2014), alterações no uso do solo (Martins et al 2015, Morais et al 2017, entre outros fatores, intensificam os impactos negativos sobre a biota (Harding et al 1998, Van Sickle et al 2004.…”

Section: 4-impactos De Reservatórios Hidrelétricosunclassified

Escalas Espaciais e Comunidades Aquáticas

Macedo¹,

Callisto²,

Castro³

et al. 2019

Bases Conceituais Para Conservação E Manejo De Bacias Hidrográficas

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“…This approach also has value for biodiversity conservation, because excess fine sediments are associated with biodiversity losses in streams (Bryce et al, 2010;Ferreira et al, 2014;Kaufmann et al, 2009) as well as lakes (Lenhardt et al, 2008;Molozzi et al, 2013). For example, Becker et al (2016) found markedly higher proportions of non-native species and individuals in Volta Grande, and Sao Simao Reservoirs than in Três Marias Reservoir.…”

Section: Environmental Management In Hydroelectric Reservoir Basinsmentioning

confidence: 99%

“…Thus, it is necessary that these facilities operate as efficiently and as long as possible, to maximize their ecosystem services (Arias et al, 2011) and benefit/cost ratios. On the other hand, the ecological impacts of hydroelectric reservoirs can be very large, for example, altered flow regimes, siltation, habitat simplification, alien species presence, and reduced biodiversity (Becker et al, 2016;Callisto et al, 2014;Morais et al, 2017;Sanches et al, 2016;Uehara et al, 2015). Conservation actions that increase the useful life of the reservoir can have conservation benefits at larger scales, by reducing the necessity for constructing new reservoirs.…”

Section: Introductionmentioning

confidence: 99%

Development and validation of an environmental fragility index (EFI) for the neotropical savannah biome

Macedo

Hughes

Kaufmann

et al. 2018

Science of The Total Environment

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Augmented production and transport of fine sediments resulting from increased human activities are major threats to freshwater ecosystems, including reservoirs and their ecosystem services. To support large scale assessment of the likelihood of soil erosion and reservoir sedimentation, we developed and validated an environmental fragility index (EFI) for the Brazilian neotropical savannah. The EFI was derived from measured geoclimatic controls on sediment production (rainfall, variation of elevation and slope, geology) and anthropogenic pressures (natural cover, road density, distance from roads and urban centers) in 111 catchments upstream of four large hydroelectric reservoirs. We evaluated the effectiveness of the EFI by regressing it against a relative bed stability index (LRBS) that assesses the degree to which stream sites draining into the reservoirs are affected by excess fine sediments. We developed the EFI on 111 of these sites and validated our model on the remaining 37 independent sites. We also compared the effectiveness of the EFI in predicting LRBS with that of a multiple linear regression model (via best-subset procedure) using 7 independent variables. The EFI was significantly correlated with the LRBS, with regression R values of 0.32 and 0.40, respectively, in development and validation sites. Although the EFI and multiple regression explained similar amounts of variability (R = 0.32 vs 0.36), the EFI had a higher F-ratio (51.6 vs 8.5) and better AICc value (333 vs 338). Because the sites were randomly selected and well-distributed across geoclimatic controlling factors, we were able to calculate spatially-explicit EFI values for all hydrologic units within the study area (~38,500 km). This model-based inference showed that over 65% of those units had high or extreme fragility. This methodology has great potential for application in the management, recovery, and preservation of hydroelectric reservoirs and streams in tropical river basins.

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Influence of limnological zones on the spatial distribution of fish assemblages in three Brazilian reservoirs

Abstract: Reservoirs

Cited by 7 publications

References 52 publications

Revisiting the concept of longitudinal gradients in reservoirs

Revisiting the concept of longitudinal gradients in reservoirs

Escalas Espaciais e Comunidades Aquáticas

Development and validation of an environmental fragility index (EFI) for the neotropical savannah biome

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