scholarly journals Community structure of aquatic insects (Ephemeroptera, Plecoptera, and Trichoptera) in Cerrado streams of Paraguay, Paraná, and São Francisco river basins

2013 ◽  
Vol 13 (1) ◽  
pp. 97-107 ◽  
Author(s):  
Renato de Mei Romero ◽  
Mônica Ceneviva-Bastos ◽  
Gustavo Henrique Baviera ◽  
Lilian Casatti
Keyword(s):  
Community Structure ◽  
Aquatic Insects ◽  
Regional Differences ◽  
River Basins ◽  
Taxonomic Composition ◽  
Taxonomic Resolution ◽  
Sao Francisco River ◽  
Original Distribution ◽  
São Francisco River

We evaluated qualitatively and quantitatively the community structure of aquatic insects (Ephemeroptera, Plecoptera, and Trichoptera) in 19 streams in areas of Cerrado in the Paraguay, Paraná, and São Francisco river basins. The number of genera and taxonomic composition were compared at spatial (at the hydrographic basins level) and conservation levels (more preserved and less preserved areas). The influence of spatial and environmental factors in richness and abundance was also evaluated. The geographical distribution of Grumicha, Coryphorus, and Austrotinodes was expanded. The highest Trichoptera richness was found in the São Francisco river basin (F = 5,602, p = 0,004) and a higher number of Ephemeroptera genera occurred in the relatively less preserved sites (F = 6,835, p = 0,009). The pattern of genera distribution was different among basins (R = 0,0336, p = 0,001), but it was similar among relatively less and more preserved areas (R = -0,039, p = 0,737). These findings can be explained by the low impact level in these streams and also by the taxonomic resolution used in this study. Latitude and instream diversity were the most important factors to explain the variation in genera richness and abundance (p = 0.004 and p = 0.026, respectively). Hence, the regional differences can be attributed to spatial influences, quantity or quality of habitats and the original distribution of taxa within each basin.

scholarly journals A poorly known case of watershed transposition between the São Francisco and upper Paraná river basins

2005 ◽  
Vol 3 (3) ◽  
pp. 449-452 ◽  
Author(s):  
Orlando Moreira Filho ◽  
Paulo Andreas Buckup
Keyword(s):  
River Basin ◽  
Fish Fauna ◽  
Rio Grande ◽  
River Basins ◽  
Hydroelectric Power ◽  
Sao Francisco River ◽  
Parana River ◽  
São Francisco River ◽  
Upper Paraná River ◽  
Parana Basin

During construction of the Furnas hydroelectric power dam in the upper rio Paraná basin in the early 1960s, the rio Piumhi drainage outflow was diverted into the headwaters of the São Francisco river basin. The rio Piumhi was a right bank tributary of the rio Grande, which unites with the rio Paranaíba to form the rio Paraná. The transposition allowed the entire fish fauna of the rio Piumhi and associated swamps, lakes, and tributaries to intermingle with the fish fauna of the São Francisco basin via the ribeirão Sujo, a right bank tributary of the São Francisco. The transposition of the watershed may have had a major impact on the current composition of the fish fauna of the upper rio São Francisco watershed.

scholarly journals Phytoplankton composition of the Itaparica and Xingó reservoirs, São Francisco River, Brazil

2015 ◽  
Vol 75 (3) ◽  
pp. 616-627 ◽  
Author(s):  
NKC Aragão-Tavares ◽  
JS Severiano ◽  
AN Moura
Keyword(s):  
Water Cycle ◽  
Taxonomic Composition ◽  
Phytoplankton Composition ◽  
Hydroelectric Reservoirs ◽  
Biological Communities ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Fragilaria Crotonensis ◽  
Aulacoseira Granulata ◽  
Instrumental Role

AbstractThe installation of dams causes changes to the integrity of rivers and to the water cycle, performing an instrumental role in the organization of biological communities, including that of phytoplankton. In the present study, we analyzed the taxonomic composition of phytoplankton in two hydroelectric reservoirs on the São Francisco River, Itaparica and Xingó reservoirs. Samples were collected at quarterly intervals between December 2007 and September 2009, at 12 sampling stations in each reservoir, totaling 92 samples. We identified 110 species in the Itaparica reservoir and 136 in the Xingó reservoir, of which diatoms followed by green algae, played a major contribution to both reservoirs. Most of the species is rare and/or occasional. In the Itaparica reservoir, there were no very frequent species, although in the Xingó this category was represented by the diatoms Aulacoseira granulata (Ehrenberg) Simonsen and Fragilaria crotonensis Kitton. These results show that, despite the similarity in the composition of phytoplankton, the reservoirs studied certainly differed regarding their environmental conditions.

scholarly journals Salinization at the mouth of the São Francisco River: impacts on the Potengi community, Alagoas, Brazil

2020 ◽  
Vol 14 ◽  
Author(s):  
João Luís Vital Filho ◽  
Denise Souza Santos ◽  
Carla Maria Correia Martins ◽  
Ricardo Barros Silva ◽  
Gleica Maria Correia Martins
Keyword(s):  
World Health ◽  
Public Authorities ◽  
The Public ◽  
Sao Francisco River ◽  
Quality Of Water ◽  
São Francisco River ◽  
The World ◽  
Health Organization

The salinization process at the mouth of the São Francisco River has been caused serious damage to the ecosystem and the quality of life among riverine populations. This study aimed to assess the perception of the riverine populations regarding the effects of water salinization at the mouth of the São Francisco River, and also to analyze the quality of water that is provided to the Potengi community in Piaçabuçu, Alagoas, Brazil. For data collection, semi- tructured interviews were conducted with 22 riverine residents. The analyses of water samples were carried out at four places in the community, in which analyzes of pH, electrical conductivity, determination of salinity, and turbidity of the water were made. It was possible to identify, during the performance of this study, the inefficiency of the public authorities, both concerning the informative and mitigating actions, as the exposure of the population to high levels of sodium and turbid water, leading to changes in the parameters concerning data established by the World Health Organization (WHO). The results revealed that one of the samples analyzed presented a saline level 17 times higher than the limit established by the WHO, and a turbidity index was 15.6 times higher than the technical limit established. Therefore, these changes have affected the health of the community, directly compromising the use of water and the composition of the biota in the region.

scholarly journals Phylogenetic signal and major ecological shifts in the ecomorphological structure of stream fish in two river basins in Brazil

2015 ◽  
Vol 13 (1) ◽  
pp. 165-178 ◽  
Author(s):  
Camilo Andrés Roa-Fuentes ◽  
Lilian Casatti ◽  
Renato de Mei Romero
Keyword(s):  
Phylogenetic Signal ◽  
River Basins ◽  
Stream Fish ◽  
Neotropical Fishes ◽  
Sao Francisco River ◽  
Niche Differences ◽  
São Francisco River ◽  
Habitat Template ◽  
History Of ◽  
Ecological Shifts

We tested the contribution of the phylogenetic and specific components to the ecomorphological structure of stream fish from the upper Paraguai River and upper São Francisco River basins, and identified nodes in the phylogenetic tree at which major ecological shifts occurred. Fish were sampled between June and October of 2008 in 12 streams (six in each basin). In total, 22 species from the upper Paraguai River basin and 12 from the upper São Francisco River were analyzed. The ecomorphological patterns exhibited phylogenetic signal, indicating that the ecomorphological similarity among species is associated with the degree of relatedness. A strong habitat template is most likely to be the primary cause for a high phylogenetic signal. A significant contribution from the specific component was also detected, supporting the idea that the phylogenetic signal occurs in some clades for some traits, but not in others. The major ecological shifts were observed in the basal nodes, suggesting that ecological niche differences appear to accumulate early in the evolutionary history of major clades. This finding reinforces the role of key traits in the diversification of Neotropical fishes. Ecological shifts in recent groups could be related to morphological modifications associated with habitat use.

scholarly journals Phytoplankton community structure of the São Francisco river estuary (Piaçabuçu-Alagoas-Brazil): a study of its diversity

2011 ◽  
Vol 15 (1) ◽  
pp. 95 ◽  
Author(s):  
Enaide Marinho Melo-Magalhães ◽  
Ariadne Nascimento Moura ◽  
Paulo Ricardo Petter Medeiros ◽  
Elvidio Landim do Rego Lima ◽  
Maria Luise Koening
Keyword(s):  
Community Structure ◽  
Phytoplankton Community ◽  
River Estuary ◽  
Phytoplankton Community Structure ◽  
Sao Francisco River ◽  
São Francisco River

Two new species of Cyphocharax (Teleostei: Characiformes: Curimatidae) from headwaters of the Jequitinhonha and São Francisco river basins, Minas Gerais, Brazil

Zootaxa ◽  
2016 ◽  
Vol 4103 (2) ◽  
pp. 154 ◽  
Author(s):  
GUILHERME MOREIRA DUTRA ◽  
IAGO DE SOUZA PENIDO ◽  
GABRIEL CAETANO GUIMARÃES DE MELLO ◽  
TIAGO CASARIM PESSALI
Keyword(s):  
New Species ◽  
River Basins ◽  
Minas Gerais ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Two New Species

Quantitative and Qualitative Characteristics of Urban Discharge to Small River Basins in the South West of Sweden

1983 ◽  
Vol 14 (3) ◽  
pp. 155-166 ◽  
Author(s):  
Wm. Hogland ◽  
R. Berndtsson
Keyword(s):  
River Basins ◽  
Small River ◽  
The South ◽  
Time Intervals ◽  
Qualitative And Quantitative ◽  
South West ◽  
Quantitative Characteristics ◽  
Qualitative Characteristics ◽  
Qualitative And Quantitative Characteristics

The paper deals with the qualitative and quantitative characteristics of urban discharge. Ratios for urban discharge and recipient flow during different time intervals are presented and discussed. The quality of the urban discharge is illustrated through pollutographs.

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