Results 271 to 280 of about 1,325,021 (311)

Impacts of fish farming on elemental stoichiometry, fluorescence components, and stable isotopes of dissolved organic matter in a tropical reservoir.

Environmental Pollution, 2020
Aquaculture impacts on aquatic organic matter and ecosystem integrity are poorly understood, especially in tropical regions. Here, we investigated the impacts of Nile tilapia net cage farming on the elemental stoichiometry, fluorescence components, and ...
R. Chaves, C. Figueredo, I. Boëchat, B. Gücker   +3 more
semanticscholar   +1 more source

Copper as an algicide in a tropical reservoir

Water Research, 1987
Copper sulphate, added at the surface, was retained in the epilimnion of a stratified tropical reservoir. For 12 days after the addition, most of the copper was associated with the soluble fraction (MW > 50,000). Later the low molecular weight fraction (MW < 50,000) dominated and persisted for more than 19 days.
P HAWKINS, D GRIFFITHS
openaire   +1 more source

Determinants of chlorophyll-a concentration in tropical reservoirs

Hydrobiologia, 2014
Predictive models for chlorophyll-a concentration are the most common ecological tools for water-quality management. However, the interactions among factors driving eutrophication processes remain poorly understood. In addition to nutrient concentrations, other variables such as, for instance, hydrology, land use and biotic interactions may also be ...
Fernanda M. Carneiro, João C. Nabout, Ludgero C. G. Vieira, Fábio Roland, Luis M. Bini   +4 more
openaire   +1 more source

Fisheries in large tropical reservoirs in South America

Lakes & Reservoirs: Science, Policy and Management for Sustainable Use, 1996
AbstractThe present status of large reservoir fisheries and their management in large reservoirs in South America are reviewed. There is a brief discussion about reservoir typology, and how most of it is inappropriate to fish. Fish in reservoirs and their introduction from other habitats are described, together with comparative yields. The main impacts
openaire   +2 more sources

Tropical reservoirs are bigger carbon sinks than soils

SIL Proceedings, 1922-2010, 2009
Introduction Worldwide reservoirs total 260 000 km 2 surface area according to recent studies (DOWNING et al. 2006). The sediments of these water bodies are carbon sinks (MULHOLLAND & ELWOOD 1982, RITCHIE 1989, DEAN & GORHAM 1998, KORTELAINEN et al.
E. Sikar, B. Matvienko, M. A. Santos, L. P. Rosa, M. B. Silva, E. O. Santos, C. H. E. D. Rocha, A. P. Bentes   +7 more
openaire   +1 more source

Hydrological studies of a tropical reservoir site, Nigeria

Journal of African Earth Sciences (1983), 1985
Abstract The study area, a potential reservoir site, is situated in the tropical belt and was chosen by an earlier worker after geophysical and geotechnical investigations. The area is underlain by the Precambrian Basement Complex. The aim of the present study is to determine whether the site could provide adequate water for a proposed reservoir ...
openaire   +1 more source

Spatial Heterogeneity of Methane Ebullition in a Large Tropical Reservoir

Environmental Science & Technology, 2011
Tropical reservoirs have been identified as important methane (CH(4)) sources to the atmosphere, primarily through turbine and downstream degassing. However, the importance of ebullition (gas bubbling) remains unclear. We hypothesized that ebullition is a disproportionately large CH(4) source from reservoirs with dendritic littoral zones because of ...
Tonya, DelSontro, Manuel J, Kunz, Tim, Kempter, Alfred, Wüest, Bernhard, Wehrli, David B, Senn   +5 more
openaire   +2 more sources

Eutrophication effects on CH4 and CO2 fluxes in a highly urbanized tropical reservoir (Southeast, Brazil)

Environmental science and pollution research international, 2021
R. F. Benassi, T. A. de Jesus, L. H. Coelho, W. S. Hanisch, M. Domingues, R. Taniwaki, Thais Araujo Goya Peduto, D. O. da Costa, M. Pompêo, W. Mitsch   +9 more
semanticscholar   +1 more source

Maximum ecological potential of tropical reservoirs and benthic invertebrate communities

Environmental Monitoring and Assessment, 2013
The Reference Condition Approach (RCA) is now widely adopted as a basis for the evaluation of the ecological quality of water bodies. In accordance with the RCA, the integrity of communities found in a given location should be analyzed according to their deviation from the communities that would be expected in the absence of anthropogenic disturbances.
Joseline, Molozzi, Maria João, Feio, Fuensanta, Salas, João Carlos, Marques, Marcos, Callisto   +4 more
openaire   +2 more sources

Environmental Risk of Metal Contamination in Sediments of Tropical Reservoirs

Bulletin of Environmental Contamination and Toxicology, 2019
Reservoir sediment can work as both sink and source for contaminants. Once released into the water column, contaminants can be toxic to biota and humans. We investigate potential ecological risk to benthic organisms by metals contamination in six reservoirs in Southeast Brazil. Results of the bioavailable fraction of copper (Cu), chromium (Cr), cadmium
Gabrielle R. Quadra, Adan Lino, Anna Sobek, Olaf Malm, Nathan Barros, Yago Guida, José Thomaz, Raquel Mendonça, Simone Cardoso, Carlos Estrada, Felipe Rust, Fábio Roland   +11 more
openaire   +2 more sources