Encontrados 27 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 ...
Contribution of primary producers to mercury trophic transfer in estuarine ecos...
Coelho, J. P.; Pereira, M. E.; Duarte, A. C.; Pardal, M. A.http://www.sciencedirect.com/science/article/B6V6N-4V2X6WR-2/2/583d9d39ab618163fcc19f359dde856c
The role of two sediment-dwelling invertebrates on the mercury transfer from se...
Coelho, J. P.; Nunes, M.; Dolbeth, M.; Pereira, M. E.; Duarte, A. C.; Pardal, M. A.The annual total and organic mercury bioaccumulation pattern of Scrobicularia plana and Hediste diversicolor was assessed to evaluate the potential mercury transfer from contaminated sediments to estuarine food webs. S. plana was found to accumulate more total and organic mercury than H. diversicolor, up to 0.79 mg kg-1 and 0.15 mg kg-1 (wet weight) respectively, with a maximum annual uptake of 0.21 mg kg-1 y-1...
Pattern and pathways for mercury lifespan bioaccumulation in Carcinus maenas
Coelho, J. P.; Reis, A. T.; Ventura, S.; Pereira, M. E.; Duarte, A. C.; Pardal, M. A.Carcinus maenas is an important and exploited natural resource in temperate estuaries, being consumed by local populations and also used as fish bait. Through bioaccumulation and bioamplification processes occurring in polluted estuarine ecosystems, this species may directly or indirectly represent a major pathway for Human contamination. No information is available on the overall lifespan bioaccumulation patte...
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...
Solar radiation prediction using wavelet decomposition
Coelho, J.P.; Cunha, José Boaventura; Oliveira, PauloNowadays, a substantial part of the agricultural production takes place in greenhouses, which enable to tune the crop growing by modifying, artificially, the environmental conditions and the plant’s nutrition. The main goal is to optimise the balance between the production economic return and the operation costs of the climate actuators. Severe environment and market restrictions jointly with an increasing tend...
Mercury contamination in invertebrate biota in a temperate coastal lagoon (Ria ...
Coelho, J. P.; Policarpo, E.; Pardal, M. A.; Millward, G. E.; Pereira, M. E.; Duarte, A. C.http://www.sciencedirect.com/science/article/B6V6N-4MSY8SD-1/1/c1c37d4bbae639a352f30d0c3317dd6f
Can Nassarius reticulatus be used as a bioindicator for Hg contamination? Resul...
Coelho, J. P.; Pimenta, J.; Gomes, R.; Barroso, C. M.; Pereira, M. E.; Pardal, M. A.; Duarte, A.The focus of this work is to explore the use of the netted whelk, Nassarius reticulatus (L.), as an indicator of mercury (Hg) contamination, by assessing the concentration of Hg in the sediments and in the whelk along the entire Portuguese coast. Total Hg concentrations ranged from below the detection limit (0.01 ng absolute mercury) up to 0.87 mg kg-1 dry weight (dwt) in sediments and between 0.06 and 1.02Â...
Pattern and annual rates of Scrobicularia plana mercury bioaccumulation in a hu...
Coelho, J. P.; Rosa, M.; Pereira, E.; Duarte, A.; Pardal, M. A.Due to the lack of knowledge regarding annual bioaccumulation rates in estuarine and marine fauna, the main aim of this work was to study the annual mercury bioaccumulation in the well-documented bivalve species Scrobicularia plana along a human induced mercury gradient in the Ria de Aveiro coastal lagoon (Portugal) and in a nearby, non-polluted system (Mondego estuary), parallel to the risks associated with it...
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