scholarly journals Effects of extended absence of flooding on the fish assemblages of three floodplain lagoons in the middle São Francisco River, Brazil

2006 ◽  
Vol 4 (4) ◽  
pp. 427-433 ◽  
Author(s):  
Paulo dos Santos Pompeu ◽  
Hugo Pereira Godinho
Keyword(s):  
Fish Species ◽  
Fish Assemblages ◽  
Local Extinction ◽  
Management Tool ◽  
Southeastern Brazil ◽  
Water Volume ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Large Water ◽  
To Receive

In the Neotropics, a large proportion of fish communities of large rivers use floodplain as habitats for feeding, reproduction, and refuge. An evaluation was made of the effects of extended dry periods on the species richness, abundance and local extinction of fish species in three marginal lagoons in the middle São Francisco River, southeastern Brazil. The studied lagoons fail to receive river floods during the study period (1994-1996). A gradual reduction in richness and abundance was observed in all lagoons. Migratory fish species had the highest probability to become extinct in the two lagoons that remained with large water volume. Species tolerant to low levels of dissolved oxygen had the lowest probability of local extinction in the lagoon showing an abrupt reduction in water volume. Similar changes to those observed in the current study are likely to occur in the floodplains if dams would be constructed in this segment of the river. Adequate water releases from Três Marias reservoir, located upstream, should be considered as a management tool for producing episodic flooding on the marginal lagoons of the region.

Historical Changes in Large River Fish Assemblages of the Americas

2005 ◽  
Keyword(s):  
Fish Species ◽  
Fish Assemblages ◽  
Sewage Treatment ◽  
Fish Fauna ◽  
Large River ◽  
Water Volume ◽  
Mean Width ◽  
Minas Gerais State ◽  
The World ◽  
Annual Discharge

<em>Abstract.</em>—The Rio das Velhas is a tributary of the Rio São Francisco, one of Brazil’s largest rivers. It is the Rio São Francisco’s second most important tributary in water volume (mean annual discharge of 631 m<sup>3</sup>/s), with a drainage area of 27,867 km<sup>2</sup>, length of 761 km, and mean width of 38 m. Like many other rivers around the world, it became heavily polluted in the 1900s. The Rio das Velhas is the most polluted river of Minas Gerais state because the basin contains approximately 4.5 million people. Unlike other Brazilian rivers, its fish fauna was studied from 1850 to 1856. Fifty-five fish species were recorded; 20 of them were first described at that time, when there were previously no more than 40 known species in the entire São Francisco basin. Recent fish collections, approximately 150 years later, indicate 107 fish species, but some may be locally extinct. There are good prospects of rehabilitating this fauna because of the connectivity of the Rio das Velhas with the São Francisco main stem, its well-preserved tributaries, and increased investments in sewage treatment.

scholarly journals Comparative larval ontogeny of two fish species (Characiformes and Siluriformes) endemic to the São Francisco River in Brazil

2019 ◽  
Vol 96 (1) ◽  
pp. 49-58
Author(s):  
Maíra S. A. Rocha ◽  
Robson C. Silva ◽  
José C. E. Santos ◽  
Marianne Schorer ◽  
Maria P. Nascimento ◽  
...  
Keyword(s):  
Fish Species ◽  
Sao Francisco River ◽  
São Francisco River

scholarly journals Comparative cytogenetics between three Characidae fish species from the São Francisco River basin

Caryologia ◽  
2007 ◽  
Vol 60 (1-2) ◽  
pp. 64-68 ◽  
Author(s):  
Peres Wellington Adriano Moreira ◽  
Luiz Antônio Carlos Bertollo ◽  
Orlando Moreira-Filho
Keyword(s):  
River Basin ◽  
Fish Species ◽  
Comparative Cytogenetics ◽  
Sao Francisco River ◽  
São Francisco River

Impact of the Três Marias dam on the reproduction of the forage fish Astyanax bimaculatus and A. fasciatus from the São Francisco River, downstream from the dam, southeastern Brazil

2013 ◽  
Vol 97 (3) ◽  
pp. 309-319 ◽  
Author(s):  
Felipe Talin Normando ◽  
Kleber Biana Santiago ◽  
Marcos Vinícius Teles Gomes ◽  
Elizete Rizzo ◽  
Nilo Bazzoli
Keyword(s):  
Southeastern Brazil ◽  
Forage Fish ◽  
Sao Francisco River ◽  
São Francisco River

scholarly journals Patterns of parasitism by Amblyomma rotundatum (Ixodidae) on Rhinella schneideri (Bufonidae) in islands of São Francisco River, Minas Gerais, Brazil

2015 ◽  
Vol 35 (6) ◽  
pp. 579-582 ◽  
Author(s):  
Hermes Ribeiro Luz ◽  
João Luiz Horacio Faccini ◽  
Hélio Ricardo da Silva
Keyword(s):  
Dry Season ◽  
Southeastern Brazil ◽  
Wet Season ◽  
Mean Intensity ◽  
Sao Francisco River ◽  
Hind Limbs ◽  
Hydroelectric Dam ◽  
São Francisco River ◽  
Rhinella Schneideri ◽  
Peak Abundance

Abstract: We sampled ticks from specimens of the rococo toad Rhinella schneideriby flannel dragging on two Islands located in the São Francisco River near the Três Marias hydroelectric dam, southeastern Brazil. A total of 120 toads was examined, of which 63 (52.5%) were parasitized only by Amblyomma rotundatumtotaling 96 larvae, 163 nymphs and 134 females. The burden of parasitism ranged from one to 43 ticks, with a mean intensity of infestation of 6.2±5.5 ticks per host. The tick A. rotundatumexhibited highly aggregated distribution. Peak abundance of larvae and nymphs occurred in the dry season (May to September), whereas peak abundance of females occurred in the wet season (October to April). We collected most ticks near the head and hind limbs of R. schneideri. The finding of two engorged A. rotundatumnymphs in the same resting places of two toads and the absence of this species in the dragged areas suggest a nidicolous behavior at the studied site.

scholarly journals Performance of water usage charge in the Nation’s domain as a water resource management tool in the São Francisco River basin

RBRH ◽  
2017 ◽  
Vol 22 (0) ◽  
Author(s):  
Leonardo Henrique Andrade Vera ◽  
◽  
Suzana Maria Gico de Lima Montenegro ◽  
Simone Rosa da Silva ◽  
◽  
...  
Keyword(s):  
River Basin ◽  
Management Tool ◽  
Financial Resources ◽  
Organic Load ◽  
Water Usage ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Load Discharge ◽  
Doce River ◽  
Paraíba Do Sul River

ABSTRACT The present work consists in a study on the performance of usage charge as a management tool in the São Francisco River Basin in the period between 2010 and 2013, according to the objectives defined by the law 9.433/97. The objectives of this study considers: assessment of user participation in the amounts billed and type of use; comparative analysis of charged and collected amounts in the basin to observe user compliance to payments; analysis of the application of financial resources obtained from the revenue particularly the actions set forth by the basin investment plan, review of the evolution of uses: withdrawal, consumption, organic load discharge to assess the influence of usage charge on the rational use of water resources and comparison of pricing mechanisms of the Paraíba do Sul river, Piracicaba-Capivari-Jundiaí rivers, Doce river and São Francisco river basins for major uses. It is noted that the compliance by users to the usage charge is increasing gradually. Even though over 91% of the payments were on time by users in 2013, the financial resources obtained and the management to employ them do not meet the actual needs for investments in the basin conservation actions. With regards to the use of water withdrawal it is not observed the effect of the usage charge. For the uses of consumption and organic load discharge, the results were minor but positive. It is recommended a review of the reference flow and parameters of charging for water resources uses, and also it is suggested a study of the mechanisms of usage charge models implemented in the Paraíba do Sul river, Piracicaba-Capivari-Jundiaí river and Doce river basins, which uses the granted and measured flows for adjustments in the usage charge model, in the São Francisco river basin. All in all, the implementation of water usage charge in the São Francisco River basin despite it being recent, it is a process that will gradually be consolidating and contributing to environmental sustainability of the basin.

scholarly journals Fish fauna of the Pandeiros River, a region of environmental protection for fish species in Minas Gerais state, Brazil

Check List ◽  
2015 ◽  
Vol 11 (1) ◽  
pp. 1507 ◽  
Author(s):  
Udson Santos ◽  
Priscilla Caroline Silva ◽  
Lucas Caetano Barros ◽  
Jorge Abdala Dergam
Keyword(s):  
Environmental Protection ◽  
Fish Species ◽  
Sustainable Use ◽  
Fish Fauna ◽  
Minas Gerais ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Minas Gerais State ◽  
Peacock Bass ◽  
A New Species

The Area of Environmental Protection of the Pandeiros River is the largest unit for sustainable use in Minas Gerais state, Brazil. The Pandeiros Wetland in the lower part of this river is considered a nursery for most migratory fish species of the São Francisco River and it is currently threatened by the introduced peacock-bass Cichla piquiti (Kullander & Ferreira, 2006). In this study, a list of fish species from the Pandeiros River was developed and compared with data for populations from other regions in the São Francisco basin. The presence of a new species record for the São Francisco River basin in the Pandeiros, and the particular local biotic and abiotic conditions of that river, support its recognition as an important conservation unit within the basin.

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