scholarly journals Evolution of the Upper São Francisco River Basin Determined by Morphotectonic Analyses, Minas Gerais, Brasil

2011 ◽  
Vol 19 (1) ◽  
Author(s):  
Alfredo Borges de Campos
Keyword(s):  
River Basin ◽  
Minas Gerais ◽  
Sao Francisco River ◽  
São Francisco River

scholarly journals Digenea of Hoplias intermedius and Hoplias malabaricus (Actinopterygii, Erythrinidae) from upper São Francisco River, Brazil

2015 ◽  
Vol 24 (2) ◽  
pp. 129-135 ◽  
Author(s):  
Danielle Priscilla Correia Costa ◽  
Cassandra Moraes Monteiro ◽  
Marilia Carvalho Brasil-Sato
Keyword(s):  
River Basin ◽  
Feeding Habits ◽  
Minas Gerais ◽  
New Host ◽  
Hoplias Malabaricus ◽  
Parasitic Fauna ◽  
Sao Francisco River ◽  
São Francisco River ◽  
New Location

A total of 103 specimens of Hoplias intermedius (Günther, 1864) and 86 specimens of H. malabaricus (Bloch, 1794) from the upper São Francisco River, State of Minas Gerais were collected between April 2011 and August 2013, and their parasitic fauna were investigated. Four species of Digenea were found: metacercariae of Austrodiplostomum sp., and Ithyoclinostomum sp.; and adult specimens of Phyllodistomum spatula Odhner, 1902, and Pseudosellacotyla lutzi (Freitas, 1941) Yamaguti, 1954. The prevalence of the metacercariae was higher than that of the adult digeneans of erythrinids from the upper São Francisco River as a result of piscivorous feeding habits of these adult erythrinids. The presence of metacercariae and adult digeneans indicate that they act as intermediate and definitive hosts, respectively, in their biological cycles. Hoplias intermedius is a new host for the four species of Digenea, and the São Francisco River basin is a new location for the known geographical distributions of P. spatula and P. lutzi.

scholarly journals Evaluation of Eta Model Rainfall Forecasts at São Francisco River Basin in Minas Gerais, Brazil

2016 ◽  
Vol 38 (2) ◽  
pp. 15
Author(s):  
R. M. G. VIEIRA ◽  
C. P. DERECZYNSKI ◽  
S. C. CHOU ◽  
J. L. GOMES ◽  
A. C. PAIVA NETO
Keyword(s):  
River Basin ◽  
Minas Gerais ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Eta Model

scholarly journals Spatial distribution of Megalancistrus barrae (Steindachner 1910), and first record on the high stretch of São Francisco basin

Check List ◽  
2015 ◽  
Vol 11 (4) ◽  
pp. 1695
Author(s):  
Gilberto N. Salvador ◽  
Gustavo R. Rosa ◽  
Gabriel Caetano Guimarães Mello ◽  
Fábio Firpe
Keyword(s):  
Spatial Distribution ◽  
River Basin ◽  
First Record ◽  
Minas Gerais ◽  
The Other ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Minas Gerais State

Megalancistrus barrae is a species endemic to the São Francisco River basin that has not previously been recorded from the Upper São Francisco basin.The present work increases the known distribution of the species by reporting new collections from two different regions in the Upper São Francisco basin: one in the Pará River and the other in the São Francisco River, downstream Três Marias dam, Minas Gerais state. In addition, this study compiles distributional data on Megalancistrus barrae from museums. 

scholarly journals Uso de SIGS para geração de mapas com a localização média da goiaba (Psidium guajava) na margem noroeste do município de São Francisco, bacia hidrográfica do rio São Francisco, MG

ForScience ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. e00846
Author(s):  
Pedro Luiz Teixeira Camargo ◽  
Paulo Pereira Martins Júnior ◽  
Marcílio Baltazar Teixeira ◽  
Fernando Antônio Madeira ◽  
Raphaella karla Portes Beserra ◽  
...  
Keyword(s):  
Remote Sensing ◽  
River Basin ◽  
Psidium Guajava ◽  
Minas Gerais ◽  
Sao Francisco River ◽  
Population Average ◽  
São Francisco River ◽  
Remote Sensing Techniques ◽  
Aid Decision ◽  
Support Methods

A gestão dos recursos naturais embasada no modelo do desenvolvimento sustentável é, sem dúvida, um dos maiores desafios de gestão ambiental. Para isso, técnicas de sensoriamento remoto têm sido cada vez mais usadas objetivando um melhor e maior auxílio à decisão. Na margem Noroeste (B) do município de São Francisco, Norte de Minas Gerais, localizado na bacia alto-média do rio São Francisco e onde o Cerrado natural sofreu intensa degradação no intervalo de 41 anos (1975-2016), realizou-se o presente estudo, objetivando, por meio da metodologia de sobreposição de imagens cartográficas, utilizando-se a ferramenta IDW do software Arcgis 10.2 gerar um mapa capaz de apresentar a média populacional da Goiaba (Psidium guajava) por ponto de coleta. Pode-se concluir, após a exitosa experiência metodológica aqui presente, que os seus exemplares arbóreos se localizam prioritariamente no extremo Sul da margem B, sendo interessante pensar como esta espécie, mesmo oriunda do Cerrado não se adaptou tão bem na área estudada. Uma hipótese para explicar isso se dá pelo fato de a semente da goiaba sofrer quebra de dormência, em geral, quando se tem flutuações abruptas de temperatura, algo não observado no local, com exceção das margens do rio São Francisco, exatamente o local onde se observa a presença dessa frutífera em maior quantidade. Recomendam-se mais estudos na região para verificação se a hipótese apresentada é de fato correta. Palavras-chave: Bacia do Rio São Francisco. Sensoriamento remoto. Métodos e técnicas de auxílio à decisão.   Use of sigs for generation of maps with the goiaba (Psidium guajava) middle location in the northwest margin of the São Francisco Municipal, São Francisco water, MG Abstract Managing natural resources responsibly is undoubtedly one of the biggest environmental management challenges. Thus, remote sensing techniques have been increasingly used to better and better aid decision making. In the Northwest (B) portion of the municipality of São Francisco, North of Minas Gerais, located in the upper-middle São Francisco River basin and where the natural Cerrado suffered intense degradation in the 41year interval (1975-2016), we conducted the present study, aiming, through the methodology of overlapping cartographic images, using the IDW tool of Arcgis 10.2 software to generate a map capable of presenting the population average of Goiaba (Psidium guajava) by collection point. We can conclude, after the successful methodological experience present here, that its tree specimens are located primarily in the extreme south of margin B, it is interesting to think how this species, even coming from the Cerrado, did not adapt so well in the studied area. A good hypothesis to explain this is due to the fact that the guava seed suffers from dormancy, in general, when there are abrupt fluctuations in temperature, something not observed in the place, except for the banks of the São Francisco River, exactly the place where observes the presence of this fruit in greater quantity. Further studies in the region are recommended to verify whether the hypothesis presented is indeed correct. Keywords: São Francisco river basin. Remote sensing. Decision support methods and Ttechniques.

scholarly journals Pluviometric patterns in the São Francisco River basin in Minas Gerais, Brazil

RBRH ◽  
2021 ◽  
Vol 26 ◽  
Author(s):  
Dawber Batista Ferreira ◽  
Gabriela Rodrigues Barroso ◽  
Marina Salim Dantas ◽  
Karla Lorrane de Oliveira ◽  
Cristiano Christofaro ◽  
...  
Keyword(s):  
River Basin ◽  
Temporal Analysis ◽  
Minas Gerais ◽  
Monthly Precipitation ◽  
Rainy Period ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Rainfall Volume ◽  
Rainfall Patterns ◽  
Monthly Precipitation Data

ABSTRACT This work aimed to evaluate the spatial-temporal variability of precipitation in the Minas Gerais section of the São Francisco River basin, an area of substantial socio-environmental relevance for the country and which has presented recent events of water scarcity. Multivariate and non-parametric statistical analyses were applied to the monthly precipitation data from 131 pluviometric stations, covering a period from 1989 to 2018. The results indicated distinct homogeneous pluviometric regions with greater spatial variability in rainfall patterns in the southern regions of the basin. Results from the temporal analysis indicated seasonality in the rainfall patterns for all seasons, with the rainy period predominantly occurring between October and March for the entire Minas Gerais section of the São Francisco River basin. No rainfall trend was identified in 78% of the stations, with the other stations (22%) showing a trend toward a reduction in rainfall volume.

Note preliminaire sur un plissement rencontre entre Pirapora (Minas Gerais) et Formosa (Goiaz), Bresil

1952 ◽  
Vol S6-II (1-3) ◽  
pp. 91-100 ◽  
Author(s):  
Francis Ruellan
Keyword(s):  
River Basin ◽  
Minas Gerais ◽  
Aerial Photographs ◽  
Field Observations ◽  
Drainage Pattern ◽  
Sao Francisco River ◽  
São Francisco River ◽  
Caledonian Orogeny

Abstract Extensive folding, rather than a predominance of horizontal Cretaceous strata as heretofore mapped between Pirapora (Minas Gerais) and Formosa (Goiaz), southwest of the Sao Francisco river basin, Brazil, is revealed by the drainage pattern, aerial photographs, and field observations. The formations involved are analogous to those of the Sao Francisco-Bambui and Gerais series, and thus are probably Ordovician and Silurian. They have been folded, presumably in the Taconian or Caledonian orogeny, peneplaned, armored with a protective lateritic crust, uplifted, and intensely dissected, with the result that an Appalachian type of topography was developed.

Spatial distribution of Biomphalaria mollusks at São Francisco River Basin, Minas Gerais, Brazil, using geostatistical procedures

Acta Tropica ◽  
2009 ◽  
Vol 109 (3) ◽  
pp. 181-186 ◽  
Author(s):  
Ricardo J.P.S. Guimarães ◽  
Corina C. Freitas ◽  
Luciano V. Dutra ◽  
Carlos A. Felgueiras ◽  
Ana C.M. Moura ◽  
...  
Keyword(s):  
Spatial Distribution ◽  
River Basin ◽  
Minas Gerais ◽  
Sao Francisco River ◽  
São Francisco River

scholarly journals Induced reproduction and reproductive characteristics of Rhinelepis aspera Agassiz, 1829 (osteichthyes: Siluriformes, Loricariidae)

1998 ◽  
Vol 41 (3) ◽  
pp. 309-314 ◽  
Author(s):  
Yoshimi Sato ◽  
Nelsy Fenerich-Verani ◽  
José Roberto Verani ◽  
Hugo Pereira Godinho ◽  
Edson Vieira Sampaio
Keyword(s):  
Body Weight ◽  
Water Temperature ◽  
River Basin ◽  
Fertilization Rate ◽  
Pituitary Extract ◽  
Reproductive Characteristics ◽  
Sao Francisco River ◽  
Absolute Fecundity ◽  
São Francisco River

Rhinelepis aspera is the largest Loricariidae species found in the São Francisco river basin where it is now rarely caught. Brooders kept in tanks were hypophysed with crude carp pituitary extract (CCPE). Approximately 82% of the females responded positive to the treatment. The egg was opaque, demersal, round, yellow and adhesive. Egg stripping was done at 212 hour-degrees (= 8.2 h) after application of the second dose of CCPE (water temperature = 25-26 ºC). Hatching of the larvae occurred at 1022 hour-degrees (= 42.2 h), after fertilization of the eggs (water temperature =24-25 ºC). Fertilization rate of the eggs was 72%. Absolute fecundity (AF), initial fertility (IF) and final fertility (FF) in relation to the females' body weight are expressed, respectively, by the equations: AF = - 33993 + 122308 Wt (r² = 0.88), IF = - 14823 + 58619 Wt (r² = 0.71) and FF = - 6553 + 29741 (r² = 0.61)

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