Gilberto Pereira

Gilberto Pereira
Federal University of Rio de Janeiro | UFRJ · Programa em Engenharia Civil

PhD

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29
Publications
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266
Citations
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January 2000 - October 2016
Federal University of Rio de Janeiro
Position
  • PostDoc Position

Publications

Publications (29)
Article
Full-text available
1 Introdução 2 Resíduos de ocorrência natural existentes no Brasil: Exemplo do fosfogesso, oriundo da produção de fertilizantes 3 Metodologia 3.1 Regras internacionais para uso de resíduos na construção civil em residências e aplicação para qualquer material de construção 4 Resultados e Discussão 4.1 Riscos devido ao uso do fosfogesso 4.2 Riscos em...
Article
Full-text available
In the context of the naturally occurring radioactive material associated with petrol exploitation, it is important to determine the concentrations of 226Ra and 228Ra in contaminated sludge originated from this activity and stored in packages. Although measurements based on chemical analyses of samples from package content can be done, difficulties...
Article
Full-text available
Short-period variability in plankton communities is poorly documented, especially for variations occurring in specific groups in the assemblage because traditional analysis is laborious and time-consuming. Moreover, it does not allow the high sampling frequency required for decision making. To overcome this limitation, we tested the submersible Cyt...
Article
Environmental heterogeneity on coastal areas is an outcome of several hydrodynamic forces. Particularly, wind-driven upwelling is usually associated with alternating periods of water mixing and stratification. In addition, the effects of near shore oceanographic conditions may vary with coastline topography and anthropogenic impacts. Herein we eval...
Article
This work aims to show the trophic structure of a real plankton community from Angra dos Reis estuary using in situ flow cytometry for data acquisition, and how competition, as a non-trophic interaction, is structured amid the trophic interactions – predation and herbivory. As no previous information is given, a great research challenge is how to m...
Article
Full-text available
Aiming to contribute to environmental management activities and coastal ecosystems preservation, this paper presents a set of computational and methodological procedures to networks analysis of interactions between marine plankton organisms from cytometric data. As ecological interactions have dynamic character, fuzzy multigraphs were designed to c...
Article
Full-text available
Coastal zones are among the most productive areas in the world, offering a wide variety of valuable habitats and ecosystems services. Despite the low population density in the Brazilian coastal zone, their distribution is quite concentrated near some coastal cities and state capitals. This concentration places enormous pressure on coastal resources...
Article
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In spite of growing evidence for potential larval retention close to parental populations, it is still commonly assumed that large-scale transport mechanisms overwhelm local reproductive patterns and control larval settlement. Here, we evaluated the likelihood of settlement rate regulation by local biological factors and remote physical transport i...
Article
Full-text available
Upwelling systems contain a high diversity of pelagic microorganisms and their composition and activity are defined by factors like temperature and nutrient concentration. Denaturing gradient gel electrophoresis (DGGE) technique was used to verify the spatial and temporal genetic variability of Bacteria and Archaea in two stations of the Arraial do...
Article
Full-text available
This study is a part of the research in monitoring systems of environmental impacts in coastal re-gions in order to develop trophic dynamic models to be used in the aquatic systems management. Meteorological influences in the variability of the nutrients, larvae concentration, dissolved oxygen (DO) and chlorophyll a were investigated in a region wh...
Article
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The coastal marine habitats are often characterized by high biological activity. Therefore, monitoring programs and conservation plans of coastal environments are needed. So, in order to contribute to decision making process of the Brazilian Information System of Coastal Management, this paper presents a preliminary analysis of the effects of simul...
Article
Full-text available
Arraial do Cabo is where upwelling occurs more intensively on the Brazilian coast. Although it is a protection area it suffers anthropogenic pressure such as harbor activities and sporadic sewage emissions. Short-time studies showed a high variability of bacterial production (BP) in this region but none of them evaluated BP during long periods in a...
Article
Full-text available
Since viruses are able to influence the trophic status and community structure they should be accessed and accounted in ecosystem functioning and management models. So, this work met a set of biological, chemical and physical time series in order to explore the correlations with marine virioplankton community across different trophic gradients. The...
Article
The aim of this work is to gain knowledge on the interactions between the chlorophyll-a and nine meroplankton larvae of epibenthonic fauna. The studied case is the Arraial do Cabo upwelling system, Southeastern of Brazil, which provides different environmental conditions. To assess this information a network approach based in probability estimative...
Article
Full-text available
Investigations surrounding the variability of productivity in upwelling regions are necessary for a better understanding the physical-biological coupling in these regions by monitoring systems of environmental impacts according to the needs of the regional coastal management. Using a spatial and temporal database from National Centers for Environme...
Article
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This aim of this paper is to assess the use of the heterotrophic/autotrophic ratio as an early indicator of trophic status as a part of development of a real time monitoring program at Anjos Bay, Rio de Janeiro, Brazil. An in-situ flow cytometer was used to quantify the abundances of phytoplankton and cyanobacteria, which were identified by chlorop...
Article
Full-text available
This work correlates time series of biological and physical variables to the marine viruses across trophic gradients within Arraial do Cabo upwelling system, Southeast of Brazil. The objective is to investigate the major controlling factors of virioplankton dynamics among different water masses. It was used an in situ and ex situ flow cytometry for...
Article
Full-text available
This work correlates time series of biological and physical variables to the marine viruses across trophic gradients within Arraial do Cabo upwelling system, Southeast of Brazil. The objective is to investigate the major controlling factors of virioplankton dynamics among different water masses. It was used an in situ and ex situ flow cytometry for...
Article
Full-text available
In the context of coastal management the aim of this paper is to present the development of a fuzzy model through the application of a Genetic algorithm in order to select the most appropriate set of variables and improve our understanding with a set of rules. The case studied is the chlorophyll response as bioindicator of ecological status in the...
Conference Paper
Full-text available
Decision-making in coastal waters management is a complex and interdisciplinary task. Particularly, to find seasonal patterns and ecological thresholds, which are not always clear in tropical areas. Therefore, the ultimate in this activity is to gain knowledge about biogenic element, the biological response, and the selection of indicators which ma...
Article
Since almost all anthropogenic activities ultimately affect the coastal waters, access properties and processes in this environment is the major issue in decision making and system management. Particularly, seasonal patterns are not clear in tropical areas, therefore, requiring environmental classification. The knowledge of long-term biogenic eleme...
Article
Full-text available
The Brazilian coastal zone presents a large extension and a variety of environments. Nevertheless, little is known about biological diversity and ecosystem dynamics. Environmental changes always occur; however, it is important to distinguish natural from anthropic variability. Under these scenarios, the aim of this work is to present a Data Mining...
Conference Paper
Full-text available
Environmental data often need to be analyzed in order to obtain information necessary for environmental management decision. The main task today is to shift what is natural and atrophic variability and the assessment of trophic status to forecast the future ecosystem behavior. Sometimes it is necessary to use the data to build a model of the enviro...
Article
Full-text available
Modeling water quality, forecasting population dynamics to define the ecosystem health is a function of some indices (resilience, diversity, production etc.) and yield of many environmental variables interactions. The assessment of properties and processes of costal zone is a major issue in aquatic system management. The aim of this paper is to tes...

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