Influence of Discharge of Três Marias Dam Over Different Temporal Scales on the Capture of Mandi in the Tailrace

Andrade, Francisco de Carvalho Dias de; Prado, Ivo Gavião; Rodrigues, Raoni Rosa; Godinho, Alexandre Lima

doi:10.5935/978-85-87929-62-4.2016.12

Cited by 4 publications

(3 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Orsi and Britton (2014) found substantial shifts in fish assemblages in the Capivara Reservoir over 20 years, including the disappearance of 27 of 50 native species and the addition of 11 non-native fish species. Therefore, the differences in fish assemblage over more than 30 years found in the present study indicate the importance of fish long-term monitoring as suggested by other studies (Andrade et al, 2017;Loures & Pompeu, 2019;Reid et al, 2019).…”

Section: Discussionsupporting

confidence: 79%

The fish fauna of Itutinga reservoir, 30 years after the first survey

Silva-Sene,

Prado,

Porto

et al. 2024

Acta Limnol. Bras.

View full text Add to dashboard Cite

Aim Monitoring altered environments is crucial to understand the impacts and the possible changes in the local fish fauna. Therefore, we aimed to compare the ichthyofauna within a 67-year-old small run-of-the-river reservoir with surveys carried out in 1986 and 2019-2021 and update the checklist of this reservoir. Methods We used the data provided by Alves et al. (1998) and sampled fish in two sites inside Itutinga reservoir using gill nets, seine nets and hand nets and at the one tributary of the area using only hand nets. Results We collected a total of 12,978 individuals belonging to 37 fish species, and the species accumulation curve showed a tendency to the asymptote. Five of the sampled species are non-native and five are migratory. Alves et al. (1998) sampled a total of 25 fish species, 17 genera, 9 families and 3 orders. We added 12 fish species to the checklist that were not recorded by Alves et al. (1998), including four non-native and two migratory. On the other hand, two migratory species and one rheophilic were registered only in the preview study. In addition, we observed important changes in the species abundance rank. Conclusions The differences in the fish assemblage structure comparing both studies indicate important changes in fish assemblages over more than 33 years. Our results highlighted the importance of long-term fish monitoring in altered environments to assess temporal variation in fish assemblages and their responses to the multiple possibilities of external stressors, such as the shift in abundance of non-native species in these environments.

show abstract

Section: Discussionsupporting

confidence: 79%

The fish fauna of Itutinga reservoir, 30 years after the first survey

Silva-Sene,

Prado,

Porto

et al. 2024

Acta Limnol. Bras.

View full text Add to dashboard Cite

show abstract

“…The three studied species are migratory and their genera are widespread in South American basins (Fernandez et al, 2004;Alves, 2007). In the study site, they are representative in samplings: Pimelodus maculatus corresponded to 35.4% of fish captured in the tailrace, while Prochilodus costatus accounted for 16.5% and Leporinus reinhardti accounted for 15.3% (Andrade et al, 2016). This high presence in the downstream areas of the HPP is one factor linked to the fish-kill events of those studied species.…”

Section: Biological Datamentioning

confidence: 87%

Downstream alterations on hydrodynamic fields by hydropower plant operations: implications for upstream fish migration

2020

View full text Add to dashboard Cite

This study identifies hydrodynamic alterations in flow downstream of a dam that are related to hydropower plant (HPP) operation and that might attract Neotropical potamodromous fish to unsafe places in the tailrace during their reproductive migration. Our hypotheses are (1) the hydrodynamic flow in the tailrace presents conditions that are strong attractive for fish than those found in the downstream reach and (2) there are no velocity barriers preventing the upstream migrant from reaching the tailrace over a wide range of turbine discharge. Two calibrated numerical models were created for the Três Marias HPP (Brazil), using different turbine discharges: (1) a three-dimensional (3D) model of flow in the tailrace and (2) a two-dimensional (2D) model for flow in the 3-km reach downstream of the dam. Resulting flow fields of the Três Marias HPP tailrace have elevated hydraulic strain and velocity homogeneity by as compared to the flow field of the downstream reach. The tailrace velocities are slow for mature individuals of all study species, which may swim from downstream reach to unsafe areas in their sustainable and prolonged mode by available corridors for different turbined discharges.

show abstract

“…O aumento de Qd pode ser interpretado pela comunidade de peixes como pulsos de cheia no rio. Loures, Pompeu (2012) relataram que a vazão defluente da UHE Três Marias, no rio São Francisco, foi um dos principais fatores que explicaram a variação da abundância de peixes no canal de fuga dessa usina, sendo o mesmo padrão observado especificamente para P. maculatus (Andrade et al, 2017). Para EM, como Qd compôs a melhor solução para resposta da comunidade de peixes às variáveis ambientais, e P. maculatus foi a espécie mais abundante da comunidade, é possível atestar a influência da variação de Qd nessa espécie.…”

Section: Discussionunclassified

Peixes a jusante de empreendimentos hidrelétricos no rio Paranaíba, MG: variação espacial e temporal das comunidades, avaliação do monitoramento contínuo e modelo de predição para mitigação de risco na interação peixe-usina

Carvalho¹

View full text Add to dashboard Cite

Influence of Discharge of Três Marias Dam Over Different Temporal Scales on the Capture of Mandi in the Tailrace

Cited by 4 publications

References 0 publications

The fish fauna of Itutinga reservoir, 30 years after the first survey

The fish fauna of Itutinga reservoir, 30 years after the first survey

Downstream alterations on hydrodynamic fields by hydropower plant operations: implications for upstream fish migration

Peixes a jusante de empreendimentos hidrelétricos no rio Paranaíba, MG: variação espacial e temporal das comunidades, avaliação do monitoramento contínuo e modelo de predição para mitigação de risco na interação peixe-usina

Contact Info

Product

Resources

About