Aquatic Resources
Mostrando 13-24 de 57 artigos, teses e dissertações.
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13. Determinación de indicadores de eutrofización en el embalse Río Tercero, Córdoba (Argentina)
Eutrophication is one of the most important environmental problems in lakes and reservoirs. Río Tercero reservoir (Argentina) is affected by various human activities that impact negatively on the system. When generating a monitoring program of aquatic systems, one of the most important considerations is to define the most significant variables. Multivariate
Rev. Ciênc. Agron.. Publicado em: 2013-09
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14. Structure and dynamics of the community of periphytic algae in a subtropical reservoir (state of São Paulo, Brazil)
Much remains to be learned about biological diversity, which constitutes a valuable natural resource. Due to the pressure that human activity has put on natural resources, biodiversity has been reduced, often unbeknownst to those responsible for that activity. Therefore, we aimed to perform a quantitative and qualitative analysis of periphytic algae in the I
Acta Bot. Bras.. Publicado em: 2013-09
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15. Revitalização do Rio Golandim (RN/Brasil) após décadas de contaminação por efluentes industriais e domésticos: este rio está recuperado?
A água é essencial para a manutenção da vida, entretanto, a poluição ambiental vem causando a perda da qualidade dos recursos hídricos, afetando assim a saúde humana. Este estudo avaliou a qualidade da água do Rio Golandim no município de São Gonçalo do Amarante/RN/Brasil após a realização do plano de recuperação através de medições de pa
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 31/05/2012
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16. Diet and trophic guilds of fish assemblages in two streams with different anthropic impacts in the northwest of Paraná, Brazil
In the present study, we describe the diets of the fish assemblages in two streams in the Maringá region of Paraná that are under the influence of different anthropic impacts. We also evaluate how the origin and use of food resources varies temporally and spatially and how the trophic organization of the fish assemblages differs between the two streams. Fi
Zoologia (Curitiba). Publicado em: 2012-02
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17. Species of the Hoplias aff malabaricus complex (Characiformes: Erythrinidae): An investigation of coexistence in a Neotropical floodplain
This study assessed the coexistence of three species of thraira present in the Upper Paraná River floodplain, using population structure as an investigation tool. The species were designated as: Hoplias sp. 1, introduced after the construction of the Itaipu reservoir, and Hoplias sp. 2 and Hoplias sp. 3, native species that have been identified as Hoplias a
Zoologia (Curitiba). Publicado em: 2012-02
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18. Aplicação de métodos não destrutivos para qualificação de combustíveis tipo dispersão de U308-Al e U3Si2-Al no reator IEA-R1 / Application of non-destructive methods for qualification of the U3O8-Al and U3Si2-Al dispersion fuels in the IEA-R1 Reactor
IPEN/CNEN-SP manufactures fuels to be used in its nuclear research reactor the IEA-R1. To qualify those fuels, it is necessary to check if they have a good performance under irradiation. As Brazil doesnt have nuclear research reactors with high neutron fluxes, or suitable hot cells for carrying out post-irradiation examination of nuclear fuels, IPEN/CNEN-SP
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 24/11/2011
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19. Dinâmica funcional da comunidade microbiana heterotrófica em lagoa rasa subtropical
Aquatic ecosystems float around trends in which abrupt transitions can occur between persistents regimes, alterning the viability of the resources or the physical and chemical parameters. Following this trend, communities vary in time and space as a result of their interactions with the environment and other organisms. Microbial communities are important com
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 2011
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20. Estudo da influência da urbanização na condição hídrica da Bacia do Rio do Cobre - Salvador-Bahia / Study of the influence of urbanization on water status of the Copper River Basin -Salvador-Bahia
This dissertation focuses the influence of the process of urbanization in urban basin. The study encloses the Basin of River Cobre, situated in the geographic region of the Rail Suburb, in Salvador city, Bahia State. Two objectives were defined: to study the influence of the process of urbanization in the generation of factors which impact the quality of wat
Publicado em: 2009
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21. Levantamento ambiental e pesqueiro dos rios Jaboatão e Pirapama no Estado de Pernambuco, Brasil
The increasing human populations that live on, work with and use resources of coastal areas place pressure on these resources, which, together with pressure from natural sources, must be monitored and understood in order to ensure the preservation of the environment and maintenance of quality of life. The rivers that empty along the coast of the state of Per
Publicado em: 2009
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22. EFEITO AGUDO E AVALIAÇÃO HISTOPATOLÓGICA DE LARVAS DO PEIXE-REI MARINHO Odontesthes argentinensis EXPOSTAS À FRAÇÃO SOLÚVEL DO PETRÓLEO, DIESEL E GASOLINA EM ÁGUA
The hydrocarbon of petroleum is currently considered as one of the main pollutants of water resources and cause recognized toxicity to aquatic biota. However, there are few studies regarding the toxicity of these compounds on the early stages of development in Brazilian fish. The objective of this study was to evaluate the median lethal concentration (LC50-9
Publicado em: 2009
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23. Estudos dos aspectos qualitativos e quantitativos da água e do sedimento no baixo curso do Rio Pitimbu (RN)
Urban growth of metropolitan areas has produced impacts of considerable importance on environment and water resources. Such impacts are in general associated with human activities, such as basin area uncontrolled development. In this context, Pitimbu river watershed, located at Natal metropolitan area, has been affected by uncontrolled development caused by
Publicado em: 2009
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24. VariaÃÃo espaÃo-temporal do microzooplÃncton no estuÃrio do rio Botafogo - PE
The microzooplanktonic community has been recognized for a long time by its tremendous ecological importance in many aquatic ecosystems since they are capable of utilizing resources which are not available to the meso- and macrozooplanltonic fractions representing intermediates between the nano- and picoplankton and higher trophic levels. In estuarine enviro
Publicado em: 2009