Encontrados 24 documentos, a visualizar página 1 de 3
Long-term monitoring of a mercury contaminated estuary (Ria de Aveiro, Portugal...
Coelho, J. P.; Pato, P.; Henriques, B.; Picado, A.; Lillebo, A. I.; Dias, J. M.; Duarte, A. C.; Pereira, M. E.; Pardal, M. A.The main aim of this research was to assess the mercury transport from an estuarine basin with a background of anthropogenic contamination during a spring tidal cycle (year 2009) and compare it with two previous tidal cycles (years 1994 and 1999), as part of a long-term monitoring program. Results showed that effective mercury transport occurs both in the dissolved and particulate fractions (0.18 and 0.20 kg pe...
Kinetics of the PO4-P adsorption onto soils and sediments from the Mondego estu...
Otero, M.; Coelho, J. P.; Rodrigues, E. T.; Pardal, M. A.; Santos, E. B. H.; Esteves, V. I.; Lillebo, A. I.In order to assess the status of a North Atlantic Ocean Ecoregion (Mondego system, Portugal) after the implementation of a management programme, a study on PO4-P sorption was carried out. Considering that sorption velocity markedly determines the systems promptness to phosphorus external loading, the kinetics of the sorption of PO4-P onto estuarine sediments and the upstream agricultural soils was studied. The ...
Mercury mobility in a salt marsh colonised by Halimione portulacoides
Válega, M.; Lillebø, A. I.; Caçador, I.; Pereira, M. E.; Duarte, A. C.; Pardal, M. A.The present study intends to increase the knowledge on the mobility of mercury in a salt marsh colonised by Halimione portulacoides. Mercury distribution in the sediment layers and its incorporation into the plant biomass were assessed, as well as the potential export of mercury from the contaminated area to the adjacent environment. Mercury pools in the sediments ranged from 560 to 943 mg m-2 and are largely a...
The response of primary producer assemblages to mitigation measures to reduce e...
Leston, S.; Lillebø, A. I.; Pardal, M. A.The Mondego estuary is a well-described system located on the North Atlantic Ocean, where cultural eutrophication progressed over the last decades of the 20th century. Consequently, and due to a large productivity of Ulva spp., Zostera noltii meadows were severely reduced with a concomitant decrease in environmental quality. In 1998, experimental mitigation measures were implemented, via changes in hydrology to...
Long-term effects of mercury in a salt marsh: Hysteresis in the distribution of...
Válega, M.; Lillebø, A. I.; Pereira, M. E.; Duarte, A. C.; Pardal, M. A.During four decades, the Ria de Aveiro was subjected to the loading of mercury from a chlor-alkali industry, resulting in the deposition of several tons of mercury in the sediments. The present study evaluates the impact of this disturbance and the recovery processes, temporally and spatially, by means of examining the richness of the species of salt marsh plants and mercury concentrations in sediments over the...
Influence of bioturbation by Hediste diversicolor on mercury fluxes from estuar...
Cardoso, P. G.; Lillebø, A. I.; Lopes, C. B.; Pereira, E.; Duarte, A. C.; Pardal, M. A.Mercury, with its reactive forms being the most deleterious for the trophic chains, has been identified as a major pollutant in a few confined bodies of the coastal zone. Due to feeding, burrowing, and bioirrigation activities, infauna are known to play a crucial role in the biogeochemical processes of contaminants. The main goal of the present study is to evaluate the effects of Hediste diversicolor bioturbati...
Assessment of methylmercury production in a temperate salt marsh (Ria de Aveiro...
Válega, M.; Lillebø, A. I.; Pereira, M. E.; Corns, W. T.; Stockwell, P. B.; Duarte, A. C.; Pardal, M. A.http://www.sciencedirect.com/science/article/B6V6N-4R718RP-2/1/3b5a21889355817d215071a3a8033fbc
Mercury in salt marshes ecosystems: Halimione portulacoides as biomonitor
Válega, M.; Lillebø, A. I.; Pereira, M. E.; Caçador, I.; Duarte, A. C.; Pardal, M. A.http://www.sciencedirect.com/science/article/B6V74-4TFV904-1/2/e4e4acaa50b773a40436188282a1f9e9
Mercury pollution in Ria de Aveiro (Portugal): a review of the system assessment
Pereira, M. E.; Lillebø, A. I.; Pato, P.; Válega, M.; Coelho, J. P.; Lopes, C. B.; Rodrigues, S.; Cachada, A.; Otero, M.; Pardal, M. A.; Duarte, A. C.The Ria de Aveiro (Portugal) is a coast al lagoon adjacent to the Atlantic Ocean and it has an inner bay (Laranjo bay) that received a highly contaminated effluent discharged by a mercury cell chlor-alkali plant from the 1950s until 1994. The aim of this study is to review in a holistic way several research studies that have been carried out in the Ria de Aveiro, in order to evaluate the remobilization of the m...
The impact of extreme flooding events and anthropogenic stressors on the macrob...
Cardoso, P. G.; Raffaelli, D.; Lillebø, A. I.; Verdelhos, T.; Pardal, M. A.Marine and coastal environments are among the most ecologically and socio-economically important habitats on Earth. However, climate change associated with a variety of anthropogenic stressors (e.g. eutrophication) may interact to produce combined impacts on biodiversity and ecosystem functioning, which in turn will have profound implications for marine ecosystems and the economic and social systems that depend...
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