High Resolution Remote Sensing based Quantification of the Remnant Vegetation Cover in the Araguaia River Basin, Central Brazil

Author(s):  
Manuel E. Ferreira ◽  
Laerte G. Ferreira ◽  
Edgardo M. Latrubesse ◽  
Fausto Miziara
2019 ◽  
Vol 27 (4) ◽  
pp. 284-290
Author(s):  
Túlio Dornas ◽  
Willian Menq ◽  
Tiago Junqueira ◽  
Estevão F. Santos

AbstractThe Peregrine Falco peregrinus, is an Nearctic migrant to Brazil where its status in central Brazil is still poorly known. Herein we present a compilation of records of the species from the state of Tocantins and comment on its use of a wintering site in the state of Goiás. These records show that the Tocantins-Araguaia River Basin is a migration route for the species, and therefore a mid-continental migration route through the interior of South America.


2019 ◽  
Vol 31 ◽  
Author(s):  
Maria Tereza Ribeiro Alves ◽  
Karine Borges Machado ◽  
Manuel Eduardo Ferreira ◽  
Ludgero Cardoso Galli Vieira ◽  
João Carlos Nabout

Abstract Aim This study aimed to investigate the relative influence of climate (temperature and precipitation) and land use on limnological features of 30 floodplain lakes in the Araguaia River, in Central Brazil, an important river that drains in the Brazilian Cerrado. Methods The lakes were sampled in one same period, at a large spatial scale (900 km along the river) covering climate and landscape variability. For decomposing the relative importance of land use and climate, we used the RDA and partitioning variance techniques. Results The lakes presented limnological gradient along the floodplain; in general, the lakes presented low transparency, nutrients concentrations (total nitrogen and total phosphorus) and oxygen saturation. The water pH was considered weakly acidic. Considering land use in Araguaia river basin, lakes in downstream presented more remnant vegetation and lakes in upstream presented more livestock and agriculture soil use. The climate conditions were the most important in explaining the variation in limnological characteristics of the lakes, while the individual analysis of limnological variables showed that land use was important to explain to the pH and transparency of the water. Conclusions Finally, this study showed the importance of investigating regional climatic attributes and land use information to explain the limnological characterization of floodplain lakes. Thus, it highlights the importance of the possible impacts of global climate change on limnological conditions.


2009 ◽  
Vol 7 (3) ◽  
pp. 421-428 ◽  
Author(s):  
Tatiana Lima de Melo ◽  
Francisco Leonardo Tejerina-Garro ◽  
Cesar Enrique de Melo

This study aims to determine which of twelve environmental parameters (five physicochemical and seven hydromorphological) influence on the fish assemblage structure of the lower Mortes River basin located in the Bananal floodplain of the Araguaia River basin, Central Brazil. Sampling was conducted in six stretches of 1000 m each during the high and low waters. Fish were captured using gill nets and environmental parameters were measured by portable equipment or determined visually. The co-inertia analysis indicated that two physicochemical (dissolved oxygen and water transparency), and four hydromorphological (channel width and depth, riparian vegetation cover and type of the riverside substrate) parameters structure the fish assemblages, both driven by the regional hydrological patterns (flood pulse). These results are explained by fish-environmental parameters relationship characteristic of the aquatic Neotropical systems.


Author(s):  
Bruno Bastos Gonçalves ◽  
Francisco Leonardo Tejerina-Garro ◽  
Carlos De Melo e Silva Neto

Este estudo objetiva avaliar o fator de condição (K) de cinco espécies de peixes (Serrasalmus rhombeus, Psectrogaster amazonica, Loricaria cataphracta, Panaque nigrolineatus e Squaliforma emarginata). As coletas foram realizadas utilizando-se quatro jogos de redes de malhar e cinco armadilhas, os quais foram colocados ao longo de um trecho de 1000 m das 17:00 às 7:00. Os peixes coletados foram identificados taxonomicamente, pesados (g) e medidos (comprimento standard; mm). A condição física dos peixes foi calculada pelo fator de condição (K=W/L³) e comparada por grupo de cursos de água utilizando um teste de Kruskal-Wallis. Das cinco espécies consideradas S. emarginata e P. amazonica mostraram diferenças na condição física por grupo de cursos de água. Os maiores valores de K de ambas as espécies correspondem aos espécimes localizados em cursos de água de cabeceira, enquanto que baixos valores são encontrados em peixes dos cursos de água na planície.


2020 ◽  
Vol 16 (02) ◽  
pp. 31-50
Author(s):  
Angélica Estigarribia São Miguel ◽  
Rafael Brugnolli Medeiros ◽  
Weslen Manari Gomes

A fragilidade ambiental diz respeito à fragilidade do ambiente em função de qualquer tipo de dano causado pela dinâmica ambiental, seja de forma natural e/ou antrópica, sendo relacionada com a erosão do solo e assoreamento dos rios. O objetivo desta pesquisa foi realizar uma análise da fragilidade ambiental da bacia hidrográfica do ribeirão São Pedro, no município de Santa Rita do Pardo/MS, analisando suas características físicas e o uso da terra e cobertura vegetal. Para tanto, a metodologia consiste em duas etapas: a primeira delas na avaliação das precipitações buscando algumas estações meteorológicas no entorno da bacia hidrográfica, trabalhando em ambiente SIG ArcGis 10. A segunda diz respeito ao manuseio das informações sobre áreas prioritárias e solos, buscou-se dados do SISLA/IMASUL, a declividade, trabalhou-se com o modelo digital de terreno SRTM e para o uso da terra e cobertura vegetal a utilização das imagens de satélite Landsat 8. Com isso, a interpolação dessas informações foi embasada na proposta metodológica de Ross (1994) para a fragilidade ambiental. As classes de fragilidade obtidas são a categoria baixa que se mostrou dominante na bacia, sendo presentes em matas nativas e pastagens, a categoria média e alta, que juntas apresentaram 39,56% da área total da bacia foram encontradas em locais com alto declive, concluindo assim que a bacia hidrográfica necessita da análise de suas características, onde qualquer mudança em um de seus elementos pode alterar a fragilidade do local, prejudicando assim, seus recursos naturais. Palavras-chave: Fragilidade ambiental. Sensoriamento Remoto. Uso da terra e cobertura vegetal.   EMPLOYMENT OF REMOTE SENSING AND GEOGRAPHIC INFORMATION SYSTEM IN EVALUATION OF ENVIRONMENTAL FRAGILITY OF HYDROGRAPHIC BASIN SÃO PEDRO, SANTA RITA DO PARDO/MS ABSTRACT The environmental fragility refers to the fragility of the environment due to any kind of damage caused by the environmental dynamics, either naturally or anthropically, and is related to soil erosion and silting of rivers. The objective of this research was to analyze the environmental fragility of the São Pedro river basin, in the municipality of Santa Rita do Pardo / MS, analyzing its physical characteristics and the use of land and vegetation cover. To do so, the methodology consists of two stages: the first one in the evaluation of precipitation by searching for some meteorological stations around the watershed, working in ArcGis 10 GIS environment. The second one concerns the handling of information on priority areas and soils, if data from the SISLA / IMASUL, the slope was worked with the SRTM digital terrain model and for the land use and vegetation cover the use of Landsat 8 satellite images. With this, the interpolation of this information was based on the methodological proposal of Ross (1994) for environmental fragility. The fragility classes obtained are the low category that was dominant in the basin, being present in native forests and pastures, the medium and high category, which together presented 39.56% of the total area of ​​the basin were found in places with high slope, thus concluding that the river basin needs the analysis of its characteristics, where any change in one of its elements can alter the fragility of the place, thus damaging its natural resources. Key Words: Environmental fragility. Remote Sensing. Land use and vegetation cover.   EMPLEO DEL SENSORIAMIENTO REMOTO Y SISTEMA DE INFORMACIÓN GEOGRÁFICA EN LA EVALUACIÓN DE LA FRAGILIDAD AMBIENTAL DE LA BACIA HIDROGRÁFICA DEL RIBEIRÃO SÃO PEDRO, SANTA RITA DO PARDO/MS RESUMEN La fragilidad ambiental se refiere a la fragilidad del ambiente en función de cualquier tipo de daño causado por la dinámica ambiental, sea de forma natural y / o antrópica, estando relacionada con la erosión del suelo y la sedimentación de los ríos. El objetivo de esta investigación fue realizar un análisis de la fragilidad ambiental de la cuenca hidrográfica del río San Pedro, en el municipio de Santa Rita do Pardo / MS, analizando sus características físicas y el uso de la tierra y cobertura vegetal. Para ello, la metodología consiste en dos etapas: la primera de ellas en la evaluación de las precipitaciones buscando algunas estaciones meteorológicas en el entorno de la cuenca hidrográfica, trabajando en ambiente SIG ArcGis 10. La segunda se refiere al manejo de las informaciones sobre áreas prioritarias y suelos, si los datos del SISLA / IMASUL, la declividad, se trabajó con el modelo digital de terreno SRTM y para el uso de la tierra y cobertura vegetal la utilización de las imágenes de satélite Landsat 8. Con ello, la interpolación de esas informaciones se basó en la propuesta metodológica de Ross (1994) para la fragilidad ambiental. Las clases de fragilidad obtenidas son la categoría baja que se mostró dominante en la cuenca, siendo presentes en bosques nativos y pastos, la categoría media y alta, que juntas presentaron el 39,56% del área total de la cuenca se encontraron en locales con alto declive, concluyendo así que la cuenca hidrográfica necesita el análisis de sus características, donde cualquier cambio en uno de sus elementos puede alterar la fragilidad del local, perjudicando así sus recursos naturales. Palabras clave: Fragilidad ambiental. Detección remota. Uso de la tierra y cobertura vegetal.


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