523 resultados para lagoas
Resumo:
Pós-graduação em Engenharia Civil - FEIS
Resumo:
Ichthyofaunistic studies aims to broad the knowledge of composition, abundance and distribution of species in certain areas, and when possible, to infer patterns of distribution, as well as extrinsic factors that affect these patterns in space and time. The Paranapanema River suffers the impact of the construction of hydroelectric power plants in cascade system along its main channel, changing the characteristics of lotic to lentic and semi-lentic. These changes affect the entire biocenosis and the surroundings of the reservoir and, in particular, the fish fauna. In this context, the aim of this study was to characterize the fish assemblage in two lakes and stretches of the main channel, located near the outfall of the Paranapanema River, Jurumirim reservoir area, comparing them to their composition and structure, using ecological indices as tools. Fish were caught every three months from April 2011 to January 2013, using gill nets of various mesh openings in four stretches: Environment 1 - Calha Sete Ilhas, Environment 2 - Calha Poço da Pedra, Environment 3 - Lagoa Sete Ilhas and Environment 4 - Lagoa Poço de Pedra. After the capture, the specimens were identified and biometric analysis was performed (total and standard length weight). We captured 4,006 individuals belonging to four orders and 34 species, 31 native species and three non-native species. In abundance (n) and number of species (S), there was a predominance of Characiformes (57 %) followed by Siluriformes (31%). Overall, most of the species was constant concerning the frequency of capture. The five most representative species in abundance were Schizodon intermedius, Cyphocarax modestus, Pimelodus maculatus, Hoplosternum littorale and Serrasalmus maculatus, contributing with 60% of total individuals captured. Regarding the stretches, these species present diversity (H'), evenness (E), dominance (D) and richness (d) of similar species, since the abundance was higher in ...
Resumo:
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Resumo:
Pós-graduação em Doenças Tropicais - FMB
Resumo:
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Resumo:
Mode of access: Internet.
Resumo:
Stabilization ponds are biological treatment systems in that stabilization of organic matter is performed by the bacterial oxidation and / or reduction of photosynthetic algae. This study aimed to monitor and evaluate the efficiency of stabilization ponds in the Rio Grande do Norte State. Collections were made of the treated effluent, made directly in the output boxes of facultative lagoons and maturation (M1 and M2) and raw sewage (EB) that arrived at the stations. The variables analyzed were: pH, temperature, dissolved oxygen, total suspended solids, chlorophyll "a", apparent color, total phosphorus, organic nitrogen, ammonia nitrogen, Kjeldahl nitrogen, turbidity, cyanobacteria density and concentrations of microcystin. Variance analysis (ANOVA one way) observing the premises using the Tukey test, so as to check differences between treatments. The evaluate the stations found to COD removals in the bands of 48,8% (Pipa) to 75,8% (Caiçara Rio do Vento) and 57,5% (Pipa) to 83,0% (Santo Antônio), respectively. The mean concentrations of cyanobacteria varied from LFs density of 62,545 cels.mL-1 (Pedro Velho Roça) cels.mL-1 to 2,669,048 (Ponta Negra), while the final effluent showed range between 9,072 Cels.mL- 1 (Pedro Velho Roça) to 1,899,981 cels.mL-1 (Macau – Ilha de Santana) and the average concentrations of microcystin the final effluent ranged from 0.02 μg.L-1 (Ponta Negra) to 0.15 μg.L-1 (Macau – Ilha de Santana) at the studied the stations.
Resumo:
2016
Resumo:
2016
Resumo:
O município Fortaleza tem uma área de 336 km², apresentando três bacias hidrográficas: do Rio Cocó (215,9 km²), do Rio Maranguapinho (96,5 km²) e da vertente marítima (23,6 km²). Elas se caracterizam pela presença de lagoas e açudes, que constituem reservas de água doce, exercendo papel fundamental no suprimento hídrico da população, na manutenção do microclima, na valorização da paisagem urbana, sendo suporte de vida para varias espécies. As lagoas constituem também um potencial para desenvolvimento das atividades de pesca e lazer. O crescimento desordenado de Fortaleza tem gerado sérios problemas ambientais como os aterramentos e a poluição desses recursos hídricos. O presente trabalho teve como objetivo analisar o processo evolutivo das principais lagoas do sistema lacustre litorâneo de Fortaleza nas ultimas décadas. A metodologia consistiu em fazer uma análise comparativa de mapas e fotografias aéreas no período de 1958 a 2008 determinado o processo evolutivo de uso e ocupação desses recursos hídricos, utilizando técnicas de sensoriamento remoto. Pudemos observar a velocidade da ocupação urbana, identificar as áreas de maior degradação ambiental no entorno das lagoas, calcular as áreas devastadas e propor medidas de mitigação e de recuperação ambiental do sistema lacustre litorâneo da cidade de Fortaleza.
Resumo:
2016
Resumo:
2016