|
|
|
| Registros recuperados: 36 | |
|
|
| Dias, Nelson Wellausen; Batista, Getulio; Targa, Marcelo dos Santos; Novo, Evlyn Marcia Leão Moraes; Barbosa, Claudio Clemente. |
| As águas do rio Paraíba do Sul apresentam um alto nível de degradação ambiental em função do despejo direto de efluentes domésticos sem tratamento e de contaminações de origem difusa (sedimentos, nutrientes e matéria orgânica) provenientes do carreamento de solo erodido, fertilizantes, pesticidas, herbicidas e dejetos de animais para os canais de drenagem. Comparativamente, a água do reservatório de Paraibuna possui qualidade de água significativamente superior aos demais trechos do Rio Paraíba do Sul devido ao fato de estar a montante dos principais centros urbanos do Vale do Paraíba. Entretanto as águas que abastecem esta represa são provenientes de duas bacias (Paraibuna e Paraitinga) com características de cobertura e uso do solo bastante distintas que... |
| Tipo: Article |
Palavras-chave: Represas; Sedimentação; Sensoriamento remoto hiperespectral; Hyperspectral remote sensing; Reservoirs; Sedimentation. |
| Ano: 2006 |
URL: http://hdl.handle.net/2315/41 |
| |
|
| |
|
| |
|
|
| The increasing number of deteriorating old dams that need renovation or have lost their function make dam removal a viable management option. There are at least four major reasons for dam removal: safety, law and policy, economy, and ecology. Here we discuss 17 Swedish dams that were recently considered for removal. Because dam removal usually causes controversy, dam removal initiatives may succeed, fail, or result in a compromise such as a bypass channel for migrating fish. We identify and discuss three major obstructions to dam removal: funding, cultural-historical values, and threatened species. To facilitate dam removal, the reasons for, and the effects of, dam removal must be carefully explained, and the public and stakeholders must be kept... |
| Tipo: Peer-Reviewed Insight |
Palavras-chave: Controversies; Dam removal; Information; Obstructions; Reservoirs; Rivers; Stakeholder involvement; Sweden. |
| Ano: 2009 |
|
| |
|
|
| Leboulanger, C; Bouvy, M; Pagano, M; Dufour, Robert; Got, P; Cecchi, P. |
| This study focused on the effects of two pesticides, paraquat (herbicide) and deltamethrin (insecticide), which are two common molecules used intensively in Burkina Faso. Natural bacterial populations, phytoplankton cultures (one cyanobacterium, Cylindrospermopsis raciborskii, and one chlorophycea, Monoraphidium sp.), and two species of zooplankton (Diaphanosoma excisum and Moina micrura) were isolated from aquatic communities and were used as biological targets in the experimental protocols. Paraquat was moderately toxic to bacteria and phytoplankton, whereas deltamethrin was significantly toxic only to the zooplankton species. Paradoxically, the chlorophycea Monoraphidium sp. exhibited a significant increase of in vitro fluorescence after 48 h at the... |
| Tipo: Text |
Palavras-chave: West Africa; Reservoirs; Planktonic organisms; Deltamethrin; Paraquat. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/2009/publication-5287.pdf |
| |
|
| |
|
|
| De Fries,Lucas; Rosa,Gilberto da; Silva,José Pezzi da; Vilella,Fábio Silveira; Becker,Fernando Gertum. |
| ABSTRACT Fish reproduction in floodplain rivers is often linked to flow regime and with the inundation of floodplain habitats. However, in confined rivers, where floodplains are absent, the relation between reproduction and flow can in comparison be expected to be distinct. In this study, we describe the reproductive life-history of Hemiancistrus fuliginosus and Hypostomus isbrueckeri in a confined river and discuss its differences relative to floodplain loricariids and also the implications for effects of dam construction and flow regulation. We found the reproductive peak of both species occurred during lowering waters, just after maximum river flow, in contrast to floodplain species that tend to spawn during rising waters. The studied species presented... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biodiversity; Environment; Flow regulation; Hydropower; Reservoirs. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252018000400209 |
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
| Johnston, Robyn M.; McCartney, Matthew P.. |
| For agriculture there is a continuum of water storage options, ranging from groundwater aquifers, soil water, natural wetlands and small ponds and tanks to large reservoirs. In any situation each of these has its own niche in terms of technical feasibility, socioeconomic sustainability and impact on public health and the environment. Planning storage requires insight into impending needs and also a good understanding of what already exists and what was, and was not, successful, in the past. This report provides an inventory of existing and prospective water storage in the Ghanaian Volta and the Ethiopian Blue Nile basins. It provides as much quantitative data as possible, but highlights both the dearth of readily available information and the lack of... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Water storage; River basins; Reservoirs; Ponds; Tanks; Groundwater; Soil moisture; Wetlands; Environmental Economics and Policy; Farm Management. |
| Ano: 2010 |
URL: http://purl.umn.edu/113608 |
| |
|
| |
|
|
| Sant'Anna,Célia L.; Melcher,Silvia S.; Carvalho,Maria do Carmo; Gelmego,Marcina P.; Azevedo,Maria Teresa de P.. |
| Considering the great ecological and sanitary importance of the cyanobacteria and the need of detailed information about these organisms in Brazilian water bodies, the present study aims at contributing towards the knowledge of the cyanobacterial flora of five reservoirs belonging to the upper Tietê Basin, São Paulo: Billings, Guarapiranga, Jundiaí, Pirapora, Ponte Nova and Taiaçupeba. In the past several years, these reservoirs have been submitted to severe environmental deterioration and have repeatedly presented cyanobacterial blooms, including those of toxic species. The samples were collected between 1997 and 2003 either with plankton net (20 µm mesh) or van Dorn's bottle, and preserved with lugol solution or formaldehyde. Some species were isolated... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brazil; Diversity; Planktic Cyanobacteria; Reservoirs. |
| Ano: 2007 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042007000100002 |
| |
| Registros recuperados: 36 | |
|
|
|
