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 ◽  
...  

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.

2015 ◽  
Vol 24 (2) ◽  
pp. 129-135 ◽  
Author(s):  
Danielle Priscilla Correia Costa ◽  
Cassandra Moraes Monteiro ◽  
Marilia Carvalho Brasil-Sato

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.


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

Check List ◽  
2015 ◽  
Vol 11 (4) ◽  
pp. 1695
Author(s):  
Gilberto N. Salvador ◽  
Gustavo R. Rosa ◽  
Gabriel Caetano Guimarães Mello ◽  
Fábio Firpe

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. 


RBRH ◽  
2021 ◽  
Vol 26 ◽  
Author(s):  
Dawber Batista Ferreira ◽  
Gabriela Rodrigues Barroso ◽  
Marina Salim Dantas ◽  
Karla Lorrane de Oliveira ◽  
Cristiano Christofaro ◽  
...  

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.


2020 ◽  
Vol 13 (1) ◽  
pp. 087
Author(s):  
Fernanda Paula Bicalho Pio ◽  
Eliane Maria Vieira

O desenvolvimento da humanidade e consequente alteração no uso do solo vem tornando áreas cada vez mais susceptíveis à incêndios florestais, fato agravado pela prática de queimadas. Eventos de queima são considerados preocupantes devido a abrangência dos impactos que influenciam, inclusive nas mudanças climáticas. Assim, técnicas de sensoriamento remoto podem ser empregadas para identificação e espacialização de áreas queimadas. A gravidade dos impactos gerados torna visível a importância de estudos capazes de detectar cicatrizes de queimadas a fim contribuir com o desenvolvimento de técnicas de monitoramento, conscientização, prevenção e recuperação de áreas afetadas.  Assim, o presente estudo objetivou gerar o índice de queimada (NBR) bem como sua variação (NBR) e o Índice Normalizado de Diferença de Água (NDWI) para distinção entre áreas queimadas e áreas úmidas para a região da bacia hidrográfica do rio Piracicaba, Minas Gerais, utilizando cenas Landsat 8 órbita/ponto 217/074 e 218/074 dos meses de agosto e setembro de 2016. A eficiência do método para detecção de áreas queimadas foi analisada a partir da comparação com polígonos de queimadas do banco de dados do INPE e pontos de ocorrência de incêndio fornecidos pelo 4º Pelotão de Bombeiros Militar de Itabira. Os resultados da NBR foram classificados em níveis de severidade e mostraram-se eficientes para a detecção de áreas queimadas quando comparados com polígonos de registro de queimadas do INPE. Com o cálculo do índice para toda a bacia pôde-se perceber regiões com maior ocorrência das classes moderada e alta severidade nas porções noroeste e nordeste da bacia. Determination of Areas Affected by Burns in Watersheds by the Queimada Index (Nbr), Case Study of the Piracicaba-MG River Basin ABSTRACTThe development of mankind and consequent alteration in land use has made areas increasingly susceptible to forest fires, a fact aggravated by the practice of burning. Burning events are considered worrisome due to the extent of the impacts that influence, including climate change. Thus, remote sensing techniques can be used to identify and spatialize burned areas. The severity of the impacts generated makes visible the importance of studies capable of detecting burn scars in order to contribute to the development of monitoring techniques, awareness, prevention and recovery of affected areas. Thus, the present study aimed to generate the burn rate (NBR) as well as its variation (ΔNBR) and the Normalized Water Difference Index (NDWI) to distinguish between burned areas and wetlands for the Piracicaba river basin region, Minas Gerais, using Landsat 8 scenes orbit / point 217/074 and 218/074 from the months of August and September 2016. The efficiency of the method for the detection of burned areas was analyzed from the comparison with burned polygons of the INPE and fire occurrence points provided by the 4th Itabira Military Fire Squad. The results of ΔNBR were classified in severity levels and were efficient for the detection of burned areas when compared to INPE burn logs. With the calculation of the index for the whole basin it was possible to perceive regions with higher occurrence of the moderate and high severity classes in the northwest and northeast portions of the basin.Keywords: burned, sevirity of fire, remote sensing, burn rate


1952 ◽  
Vol S6-II (1-3) ◽  
pp. 91-100 ◽  
Author(s):  
Francis Ruellan

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.


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 ◽  
...  

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