Benthic communities of streams related to different land uses in a hydrographic basin in southern Brazil

2008 ◽  
Vol 157 (1-4) ◽  
pp. 305-318 ◽  
Author(s):  
Luiz Ubiratan Hepp ◽  
Sandro Santos
Keyword(s):  
Benthic Communities ◽  
Land Uses ◽  
Southern Brazil ◽  
Hydrographic Basin

scholarly journals POLLUTION EFFECTS ON THE ENVIRONMENT, MACROPHYTES AND FISHES IN THE SAPUCAIA STREAM, GUAiBA HYDROGRAPHIC BASIN, RS, BRAZIL

2005 ◽  
Vol 13 (13) ◽  
pp. 27-43
Author(s):  
Tania R. Prochnow ◽  
Bernardo Liberman ◽  
Nadia T. S. Pfeifer ◽  
Marilene G. Porawski ◽  
Norma Marroni ◽  
...  
Keyword(s):  
Metal Accumulation ◽  
Sediment Quality ◽  
Rio Grande ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Pollution Effects ◽  
Hydrographic Basin ◽  
Water And Sediment ◽  
Water And Sediment Quality

This paper shows the results of air, water and sediment quality of Sapucaia stream, which belongs to Guafba Hydrographic Basin, in the State of Rio Grande do Sul, Southern Brazil. The correlations among the concentrations of Al, Cu, Fe, Mn, and Zn, present in the atmosphere, water and sediments, and their bioaccumulation in macrophytes are determined. Different degrees of pollution is characterized through the study of oxidative damage in fishes. The results indicate metal accumulation in macrophytes and fishes.

scholarly journals Multitemporal analysis of estimated soil loss for the river Mourão watershed, Paraná – Brazil

2015 ◽  
Vol 75 (4 suppl 2) ◽  
pp. 120-130 ◽  
Author(s):  
C. H. Graça ◽  
F. H. Passig ◽  
A. R. Kelniar ◽  
M. A. Piza ◽  
K. Q. Carvalho ◽  
...  
Keyword(s):  
Soil Loss ◽  
Water Erosion ◽  
Surface Erosion ◽  
Western Region ◽  
Land Uses ◽  
Geography Information System ◽  
Hydrographic Basin ◽  
Gis Environment ◽  
Geography Information ◽  
Soil Loss Equation

The multitemporal behavior of soil loss by surface water erosion in the hydrographic basin of the river Mourão in the center-western region of the Paraná state, Brazil, is analyzed. Forecast was based on the application of the Universal Soil Loss Equation (USLE) with the data integration and estimates within an Geography Information System (GIS) environment. Results had shown high mean annual rain erosivity (10,000 MJ.mm.ha–1.h–1.year–1), with great concentration in January and December. As a rule, soils have average erodibilities, exception of Dystroferric Red Latisol (low class) and Dystrophic Red Argisol (high class). Although the topographic factor was high (>20), rates lower than 1 were predominant. Main land uses comprise temporal crops and pasture throughout the years. The watershed showed a natural potential for low surface erosion. When related to usage types, yearly soil loss was also low (<50 ton.ha–1.year–1), with more critical scores that reach rates higher than 150 ton.ha–1.year–1. Soil loss over the years did not provide great distinctions in distribution standards, although it becames rather intensified in some sectors, especially in the center-eastern and southwestern sections of the watershed.

Short‐term Impacts on Soil‐quality Assessment in Alternative Land Uses of Traditional Paddy Fields in Southern Brazil

2016 ◽  
Vol 28 (2) ◽  
pp. 534-542 ◽  
Author(s):  
Amanda Posselt Martins ◽  
Luiz Gustavo de Oliveira Denardin ◽  
José Bernardo Moraes Borin ◽  
Filipe Selau Carlos ◽  
Thiago Barros ◽  
...  
Keyword(s):  
Quality Assessment ◽  
Soil Quality ◽  
Paddy Fields ◽  
Land Uses ◽  
Southern Brazil ◽  
Short Term ◽  
Soil Quality Assessment

Organic carbon pools and organic matter chemical composition in response to different land uses in southern Brazil

2020 ◽  
Author(s):  
Clever Briedis ◽  
Jeff Baldock ◽  
João C. de Moraes Sá ◽  
Josiane B. dos Santos ◽  
Janine McGowan ◽  
...  
Keyword(s):  
Organic Matter ◽  
Chemical Composition ◽  
Organic Carbon ◽  
Carbon Pools ◽  
Land Uses ◽  
Southern Brazil

scholarly journals Ichthyofauna of the hydrographic basin of the Chasqueiro Stream (Mirim Lagoon system, southern Brazil): generating subsidies for conservation and management

2015 ◽  
Vol 15 (4) ◽  
Author(s):  
Fabiano Corrêa ◽  
Edson Fontes de Oliveira ◽  
Thiago Tuchtenhagen ◽  
Juvêncio Pouey ◽  
Sérgio Piedras
Keyword(s):  
Future Generations ◽  
Southern Brazil ◽  
Hydrographic Basin ◽  
Lagoon System ◽  
Representative Species ◽  
Starting Point ◽  
Upstream Reservoir ◽  
One Year ◽  
Number Of Individuals ◽  
Rich Fauna

Studies that organize lists of species are essential and act as the starting point for future discussions on the ecology of fish in environments that are poorly studied. The present paper describes the fish assemblage of the hydrographic basin of Chasqueiro Stream, an important component of the Mirim Lagoon system. Fish were collected during one year period between August/2012 and July/2013 in six sites, comprising three biotopes: upstream, reservoir and downstream. A total of 22,853 specimens were collected, and were distributed into 83 species, 20 families, and eight orders. The two species with the largest number of individuals captured were Bryconamericus iheringii with 2,904 (12.71%) and Cheirodon ibicuiensis with 2,868 (12.55%). Characiformes and Siluriformes were the most representative orders in terms of richness and abundance. Bryconamericus iheringi and Cyanocharax alburnus were the species with the highest abundance upstream, while Hyphessobrycon luetkenii and Corydoras paleatus contributed more to the abundance downstream. Cheirodon ibicuhiensis and Heterocheirodon jacuhiensis were the most representative species in the reservoir. This study revealed a rich fauna of fish, which should be preserved for future generations and for the maintenance of local and regional biodiversity.

scholarly journals Functional trophic groups and spatial variation of aquatic insects in a hydrographic basin of Southern Brazil

2018 ◽  
Vol 5 (3) ◽  
pp. 50
Author(s):  
Mario Arthur Favretto ◽  
Elton Orlandin ◽  
Emili Bortolon Dos Santos ◽  
Osvaldo Onghero-Jr.
Keyword(s):  
Spatial Variation ◽  
Aquatic Insects ◽  
Human Impacts ◽  
Trophic Group ◽  
Environmental Conservation ◽  
Trophic Groups ◽  
Southern Brazil ◽  
Heterogeneous Distribution ◽  
Environmental Evaluation ◽  
Hydrographic Basin

In Brazil hydrographic basins are geographical unities used to environmental and hydric resources management, but few studies focus in the biodiversity variation within these unities. Here we present the results of spatial variation of aquatic insects in streams of a hydrographic basin in Southern Brazil. The insect composition was analyzed in relation to abundance of the families, functional trophic group and environmental evaluation indexes proposed by literature. The insects had a heterogeneous distribution in the sampling areas of the hydrographic basin. The most abundant families were Hydropsychidae, Philopotamidae and Leptophlebiidae, which demonstrate a good oxygenation of the water in the sampling streams. The most abundant functional trophic groups were gatherer-collector (20%) and scraper (18.92%). The indexes demonstrated the riverbeds of the streams are stable, with a high presence of fine particulate organic matter and they were considered heterotrophic. However, they also indicated a low abundance of shredders, which may be related to poor environmental conditions in the riparian forests. Therefore, here we found spatial variation of aquatic insects and indexes performed indicated the main human impacts as deforestation and inadequate land use. The data obtained also contributed to reinforce the importance of hydrographic basin as geographical unities for environmental conservation.

scholarly journals Controle da Qualidade da Água do Arroio Portão Portão, RS

2005 ◽  
Vol 32 (1) ◽  
pp. 27 ◽  
Author(s):  
ROBERTO NAIME ◽  
ROSÂNGELA SCHUCH FAGUNDES
Keyword(s):  
Quality Of Life ◽  
Environmental Conditions ◽  
Rio Grande ◽  
Economic Conditions ◽  
Actual Situation ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Chemical Parameters ◽  
Hydrographic Basin

This work presents the environment attendance of Portão River, a river of the hydrographic basin of Rio dos Sinos, Rio Grande do Sul, southern Brazil. The improvement of environmental conditions demands a diagnostic of the actual situation. By this way, it is possible to propose mitigation, compensation and promotion of better quality of life for the populations. Chemical parameters of water were observed during three months, in order to evaluate the environmental conditions, and to promote environmental improvement for this region, in the context of physical, biological and economic conditions.

Granulometry and Stability of Aggregates in Different Land Uses in the Santa Catarina Plateau of Southern, Brazil

2019 ◽  
pp. 1-6
Author(s):  
Kristiana Fiorentin dos Santos ◽  
Fabrício Tondello Barbosa ◽  
Ildegardis Bertol ◽  
Romeu De Souza Werner ◽  
Neuro Hilton Wolschick ◽  
...  
Keyword(s):  
Land Use ◽  
Sample Survey ◽  
Land Uses ◽  
Southern Brazil ◽  
Santa Catarina ◽  
Land Use Types ◽  
Different Types ◽  
The Mean ◽  
The Stability ◽  
Definition Of

The aim of the present work was to determine the granulometry and stability of aggregates in different types of land use in the Santa Catarina Plateau of southern, Brazil. The research was conducted on Capão Alto, Santa Catarina, Brazil. The land use types selected were natural forest (NF), stands pine (SP), crop-livestock integration (CLI), and burned natural rangeland (BR). The definition of the collection points in the field was performed by means of a random sample survey, with nine sampling points by type of use. The stability of aggregates in water, expressed by the mean geometric diameter of aggregates (MGD), was performed after separation of the larger aggregates in smaller aggregates by a set of sieves with 8 and 4.76 mm. Subsequently, these aggregates were fractionated by means of a set of sieves of 4.76; 2.00; 1.00; and 0.25 mm by means of shaking submerged in water. The levels of sand, silt and clay presented differences between the types of land use. MGD ranges from 4.43 to 5.70 mm in NF; from 4.06 to 5.81 mm in SP; from 3.00 to 5,45 mm in CLI; e 4.35 to 5.57 mm in BR. In general, the results showed that MGD varied little in the different types of use, and in all treatments there was a trend of decreasing soil MGD with increasing depth.

scholarly journals Predicting biological parameters of estuarine benthic communities using models based on environmental data

2004 ◽  
Vol 47 (4) ◽  
pp. 613-627 ◽  
Author(s):  
José Souto Rosa-Filho ◽  
Carlos Emílio Bemvenuti ◽  
Michael Elliott
Keyword(s):  
Discriminant Analysis ◽  
Linear Regression ◽  
Predictive Models ◽  
Benthic Communities ◽  
Environmental Data ◽  
Biological Parameters ◽  
Southern Brazil ◽  
Multiple Discriminant Analysis ◽  
Sediment Characteristics ◽  
Benthic Assemblages

This study aimed to predict the biological parameters (species composition, abundance, richness, diversity and evenness) of benthic assemblages in southern Brazil estuaries using models based on environmental data (sediment characteristics, salinity, air and water temperature and depth). Samples were collected seasonally from five estuaries between the winter of 1996 and the summer of 1998. At each estuary, samples were taken in unpolluted areas with similar characteristics related to presence or absence of vegetation, depth and distance from the mouth. In order to obtain predictive models, two methods were used, the first one based on Multiple Discriminant Analysis (MDA), and the second based on Multiple Linear Regression (MLR). Models using MDA had better results than those based on linear regression. The best results using MLR were obtained for diversity and richness. It could be concluded that the use predictions models based on environmental data would be very useful in environmental monitoring studies in estuaries.

scholarly journals Technical contributions to territorial planning and the use of ecosystemic services in a hydrographic basin with a water deficit in the Atlantic Rainforest of Brazil

2019 ◽  
Vol 14 (2) ◽  
pp. 1
Author(s):  
Douglas Leite Figueira ◽  
Ricardo Valcarcel ◽  
Marcelle Nardelli Baptista
Keyword(s):  
Water Retention ◽  
Environmental Benefits ◽  
Leeward Side ◽  
Land Uses ◽  
Direct Flow ◽  
Catchment Basin ◽  
Hydrographic Basin ◽  
Territorial Planning ◽  
Circularity Index ◽  
Group D

The catchment basin of the Dois Rios River (R2R) (3159 km2) unites the climatic and environmental effects typical of areas located on the leeward side of mountain chains. It has a deficient water balance, with sparse and very specific wet areas. This study identifies delimitation areas, and characterizes and groups those basins and floodplains which show the greatest capacity for producing ecosystemic services related to maintaining the continuity of water resources in the R2R basin. Locations with higher pluviometric indices (1500 to 2800 mm/year) were selected and grouped into micro basins with the highest potential for capturing rainfall due to their being on the leeward side of the mountains in the region (with their slopes oriented to permit them to capture humidity and concave plane curvature). The 42 basins formed 4 groups, from which the 17 micro basins with the highest probability of providing ecosystemic services were chosen, belonging to Groups III and IV. Within these groups, the 498 floodplains with the highest potential for offering ecosystemic services (Group D) present the greatest capacity for water retention and sustainable effects (high average circularity index, higher altitudes and low occupation rates). The correct use of 0.0006% of the basin can guarantee the direct flow of the drainage for the entire basin. This strategy only requires renaturation measures, discipline with regard to the land uses and strict observance of the processes which generate ecosystemic services in the floodplains of these basins, resulting in relevant socio-environmental benefits for all socioeconomic segments within the R2R basin.

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