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Effects of agricultural and urban impacts on macroinvertebrates assemblages in streams (Rio Grande do Sul, Brazil) Rev. Bras. Zool.
Hepp,Luiz Ubiratan; Milesi,Silvia V.; Biasi,Cristiane; Restello,Rozane M..
This study evaluates the effects of agricultural and urban activities on the structure and composition of benthic communities of streams in the state of Rio Grande do Sul, Brazil. Benthic macroinvertebrates were collected in streams influenced by urbanization and agriculture and in streams with no anthropogenic disturbances (reference streams). Organism density was superior in urban streams when compared with streams in the other two areas. The taxonomic richness and Shannon diversity index were higher in reference streams. The benthic fauna composition was significantly different among land uses. The classification and ordination analyses corroborated the results of variance analyses demonstrating the formation of clusters corresponding to streams with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomonitoring; Environmental quality; Land uses.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000100016
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Hidrogeochemical comparative study of the Jaú and Jacaré-Guaçu River watersheds, São Paulo, Brazil BJB
SOUZA,A. D. G. de; TUNDISI,J. G..
The main subject of the present work was to carry out a hydrochemistry comparative study between two river basins in São Paulo State: the Jacaré-Guaçu Basin (21°37'-22°22'S and 47°43'-48°57'W) and the Jaú Basin (22°09'-22°28'S and 48°16'-48°47'W). Nine sampling points in the Jacaré-Guaçu River and eight in the Jaú River were established. The water sampling was performed once each two months from March/95 to September/95. The following variables were analyzed: temperature (°C), pH, conductivity (muScm--1), dissolved oxygen (mg/L) and ionic water composition. Comparatively the Jaú River showed higher spatial variability, less oxygenated water and higher mineralization, due to high pedological and geological substrate richness, point sources existence and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: River basin; River chemistry; Land uses.
Ano: 2000 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082000000400004
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Interactions Among Ecosystem Services Across Land Uses in a Floodplain Agroecosystem Ecology and Society
Bennett, Elena M.; Department of Natural Resource Sciences and McGill School of Environment, McGill University; elena.bennett@mcgill.ca.
Managing human-dominated landscapes such as agroecosystems is one of the main challenges facing society today. Decisions about land-use management in agroecosystems involve spatial and temporal trade-offs. The key scales at which these trades-offs occur are poorly understood for most systems, and quantitative assessments of the services provided by agroecosystems under different combinations of land uses are rare. To fill these knowledge gaps, we measured 12 ecosystem services (ES), including climate regulation, gas regulation, soil stability, nutrient regulation, habitat quality, raw material production, food production, fishing, sports, recreation, education, and social relationships, in seven common land-use types at three spatial scales, i.e., patch,...
Tipo: Peer-Reviewed Reports Palavras-chave: Agroecosystem; Ecosystem services; Floodplain; Interactions; Land uses; Spatial scales; Trade-offs.
Ano: 2014
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Measuring Competition between Non-Food and Food Demand on World Grain Markets : Is Biofuel Production Compatible with Pressure for Food Production ? AgEcon
Benjamin, Catherine; Houee-Bigot, Magalie.
The flow of agricultural products between countries is conditioned by several factors including domestic and trade policy tools for the main competing exporters countries, and macroeconomic variables (such as real income per capita, rate of population growth,etc). Important structural changes are occurring on world agricultural markets that will have an impact on the long term competitiveness of countries and regions. These changes include developments in biofuels production linked to policy incentives, and the rapid growth in income and population numbers in some developing countries (such as India and China). An important issue is to identify the factors that are going to modify the balance between the supply and demand for agricultural products in the...
Tipo: Conference Paper or Presentation Palavras-chave: Modeling; Econometric; Partial equilibrium; Land uses; Biofuels; Demand and Price Analysis; International Relations/Trade.
Ano: 2007 URL: http://purl.umn.edu/9854
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Relationship between sugar cane cultivation and stream macroinvertebrate communities BABT
Corbi,Juliano José; Trivinho-Strixino,Susana.
The aim of this work was to study the influence of the sugar cane cultivation on the macroinvertebrate communities of 11 streams under different land uses. Analysis of the sediment (organic matter contents and metals) and water complemented the study. Ninety six macroinvertebrates taxa were identified, of which 54 were Chironomidae and 42 of other aquatic macroinvertebrates. The streams located in the areas of sugar cane culture and pasture presented low taxa and a great participation of Chironomidae (78% of the total). In contrast, the streams located in the areas with riparian vegetation presented a rich aquatic fauna with less participation of Chironomidae (60% of the total).
Tipo: Info:eu-repo/semantics/article Palavras-chave: Stream macroinvertebrates; Sugar cane; Land uses; Riparian vegetation.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000400015
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The effect of forest land use on the cost of drinking water supply: A spatial econometric analysis AgEcon
Abildtrup, Jens; Garcia, Serge; Stenger, Anne.
Forest land use is often associated with the protection of water resources from contamination and the reduced cost of drinking water supply. This study attempted to measure the value of the forest on the quality of water resources from a contingent market, namely drinking water supply, by estimating variations in drinking water costs as a function of variations in land uses. Spatial correlations were taken into account because of the use of different geographical scales (i.e., water service area and land uses) and the potential existence of organizational and technological spillovers between water services. We found a significant negative effect of forest land use on water costs. We found no evidence of spatial spillovers concerning the management regime...
Tipo: Presentation Palavras-chave: Water quality; Land uses; Forest; Water supply service; Spatial spillovers; Demand and Price Analysis; Land Economics/Use; Resource /Energy Economics and Policy; C21; Q23; Q25; R14.
Ano: 2011 URL: http://purl.umn.edu/120385
Registros recuperados: 6
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