Encontrados 22 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...
Influence of age, sex and breeding status on mercury accumulation patterns in t...
Tavares, S.; Xavier, J. C.; Phillips, R. A.; Pereira, M. E.; Pardal, M. A.Although mercury bio-amplifies through the food chain and accumulates in top predators, mercury concentrations in tissues of the wandering albatross are greater than in any other vertebrate, including closely related species. In order to explore the alternative explanations for this pattern, we measured total mercury concentrations in feathers, plasma and blood cells of wandering albatrosses of known age, sex a...
Metal contaminants in Largemouth bass (Micropterus salmoides) collected in larg...
Andrade, L.P.; Antunes, P.; Paulo, L.; Pereira, M.E.; Rodrigues, A.M.Largemouth bass (Micropterus salmoides) is a very important fresh water fish in the Portuguese regional cuisine mainly in the countryside (Central region and north Alentejo). Because there’s no aquaculture industry, all eaten largemouth bass in Portugal are collected in large dams (Basins of Tejo and Guadiana rivers) and small irrigation dams. For decades, the Tejo River received environmental pollutants from n...
Optical fibre-based methodology for screening the effect of probiotic bacteria ...
Silva, Lurdes I. B.; Rodrigues, Dina M.; Freitas, Ana C.; Gomes, Ana M.; Rocha-Santos, Teresa A. P; Pereira, M. E.; Duarte, A. C.A methodology based on optical fibre (OF) detection was developed for screening the potential of CLA production by Lactobacillus casei-01, Lactobacillus acidophilus La-5 and Bifidobacterium lactis B94 in probiotic curdled milk. The OF based methodology was validated by comparison with an analytical method based on gas chromatography–mass spectrometry (GC–MS) and it showed comparable linearity (between 5 and 130...
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
Mercury distribution in key tissues of fish (Liza aurata) inhabiting a contamin...
Mieiro, C. L.; Pacheco, M.; Pereira, M. E.; Duarte, A. C.This study brings a new viewpoint based on multiple-tissue analyses to form the basis for a predictive mode of mercury accumulation dynamics in fish body under field conditions. Total mercury (T–Hg) was determined in key tissues of Liza aurata captured along an estuarine contamination gradient, displaying the following hierarchy: kidney > liver > muscle > brain > gills > blood. Brain was the tissue that better ...
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 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...
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...
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