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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...
Effects of sewage pollution on the structure of rocky shore macroinvertebrate a...
Cabral-Oliveira, J.; Mendes, S.; Maranhão, P.; Pardal, M. A.The urgency to find efficient indices and indicators to prevent further deterioration of coastal areas is one of the hot topics in today’s scientific publication. However, a detailed knowledge of community responses to anthropogenic impacts is essential to sustain those indices. The studies on the response of benthic community to sewage pollution on intertidal rocky shores are generally based on visual census a...
Distribution of PCDD/Fs and dioxin-like PCBs in sediment and plants from a cont...
Nunes, Margarida; Vernisseau, Anaïs; Marchand, Philippe; Le Bizec, Bruno; Ramos, Fernando; Pardal, M. A.Concentrations and profiles of 2,3,7,8-substituted polychlorinated dibenzo-p-dioxins, polychlorinated dibenzofurans (PCDD/Fs) and dioxin-like polychlorinated biphenyls (dl- PCBs)were investigated in sediment and plants collected from a salt marsh in the Tejo estuary, Portugal. The highest PCDD/F and dl-PCB concentrations were detected in uncolonized sediments, averaging 325.25±57.55 pg g−1 dry weight (dw) and 8...
Uptake and depuration of PCB-153 in edible shrimp Palaemonetes varians and huma...
Grilo, T. F.; Cardoso, P. G.; Pato, P.; Duarte, A. C.; Pardal, M. A.A medium-term mesocosm exposure study was conducted to elucidate bioaccumulation and depuration of polychlorinated biphenyl congener 153 (PCB-153) in edible shrimp Palaemonetes varians. Over the 15-day exposure period, shrimp under different exposure concentrations exhibited a significant increase in PCB153 concentration compared with control organisms. Distinct bioaccumulation patterns and uptake rates ...
The influence of sulfathiazole on the macroalgae Ulva lactuca
Leston, Sara; Nunes, Margarida; Viegas, Ivan; Nebot, Carolina; Cepeda, Alberto; Pardal, M. A.; Ramos, FernandoSulfonamides (SA) are a class of antibiotics routinely found in environmental matrices and therefore their role as contaminants should be investigated in non-target organisms. With this purpose the present experimental work has evaluated the exposure of the chlorophycean Ulva lactuca L. to sulfathiazole (STZ), a SA drug commonly used in aquaculture, at two concentrations representing prophylactic (25 lgmL 1) an...
Frequency of micronuclei and of other nuclear abnormalities in erythrocytes of ...
Carrola, João; Santos, Nádia; Rocha, Maria J.; Fontainhas-Fernandes, António; Pardal, M. A.; Monteiro, Rogério A. F.; Rocha, EduardoFish are bioindicators of water pollution, and an increased rate of their erythrocyte nuclear morphological abnormalities (ENMAs)—and particularly of erythrocyte micronuclei (EMN)—is used as a genotoxicity biomarker. Despite the potential value of ENMAs andMN, there is scarce information about fish captured in Iberian estuaries. This is the case of the Portuguese estuaries of the Mondego, Douro and Ave, sufferi...
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 ...
Changes in zooplankton communities along a mercury contamination gradient in a ...
Cardoso, Patricia Gonçalves; Marques, Sónia Cotrim; D’Ambrosio, Mariaelena; Pereira, Eduarda; Duarte, Armando Costa; Azeiteiro, Ulisses MirandaThe main objective of this paper was to evaluate the impact of mercury on the zooplankton communities’ structure and functioning and their bioaccumulation patterns along a contamination gradient in a temperate coastal lagoon. Our results demonstrated that total abundance was not negatively affected by Hg contamination, since the most contaminated areas presented the highest values, being the copepod Acartia ton...
Juvenile nursery colonization patterns for the European flounder (Platichthys f...
Martinho, Filipe; van der Veer, Henk W.; Cabral, Henrique N.; Pardal, M. A.In this work, we analysed the latitudinal trends in the nursery habitat colonization processes of the European flounder (Platichthys flesus). This was accomplished by estimating the duration of the pelagic and metamorphic stages, aswell as the duration of the spawning period, in several nursery areas across its geographical distribution range in the European Atlantic Coast: Mondego estuary (Portugal), Vilaine e...
Organochlorine contaminants in different tissues from Platichthys flesus (Pisce...
Batista, Joana; Pato, Pedro; Duarte, Armando C.; Pardal, M. A.Polychlorinated biphenyls (PCBs) and hexachlorobenzene (HCB) are organic contaminants that tend to accumulate in fish. Estuaries are exposed to high anthropogenic activities, therefore tending to accumulate more contaminants than the adjacent coastal waters. Platichthys flesus, a fish with high economic value, was analysed for PCBs and HCB along its different age groups, in liver, gills, gonads and muscle. Youn...
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