Mercury distribution in Douro estuary (Portugal)

Ramalhosa, Elsa; Pereira, Eduarda; Vale, Carlos; Válega, Mónica; Monterroso, Paulo; Duarte, Armando C.

doi:10.1016/j.marpolbul.2005.04.020

Cited by 24 publications

(11 citation statements)

References 17 publications

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“…However, the presence and effects of genotoxic pollutants cannot be discarded, and it is likely to occur, namely facing reports of pollution by different classes of chemicals. This is the case of the estuaries Mondego, Douro and Ave rivers, in Portugal, where chemical surveys have been systematically disclosing significant amounts of pollutants of various classes, often within biologically hazardous ranges (Carvalho et al 2009;Díez et al 2005;Madureira et al 2009Madureira et al , 2010Ramalhosa et al 2005;Ribeiro et al 2009a, b;Rocha et al 2011Rocha et al , 2012aRocha et al , b, 2013a. Taking all into consideration, we suspected that fish living in those estuaries faced different levels of stress, and could be differently impacted by genotoxicity.…”

Section: Introductionmentioning

confidence: 99%

Frequency of micronuclei and of other nuclear abnormalities in erythrocytes of the grey mullet from the Mondego, Douro and Ave estuaries—Portugal

Carrola

Santos

Rocha

et al. 2014

Environ Sci Pollut Res

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Fish 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 and MN, there is scarce information about fish captured in Iberian estuaries. This is the case of the Portuguese estuaries of the Mondego, Douro and Ave, suffering from different levels of environmental stress and where chemical surveys have been disclosing significant amounts of certain pollutants. So, the aim of this study was to evaluate genotoxicants impacts and infer about the exposure at those ecosystems, using the grey mullet (Mugil cephalus) as bioindicator and considering the type and frequency of nuclear abnormalities of erythrocytes as proxies of genotoxicity. Sampling of mullets was done throughout the year in the important Mondego, Douro and Ave River estuaries (centre and north-western Portugal). The fish (total n=242) were caught in campaigns made in spring-summer and autumnwinter, using nets or fishing rods. The sampled mullets were comparable between locations in terms of the basic biometric parameters. Blood smears were stained with Diff-Quik to assess the frequencies of six types of ENMAs and MN (given per 1,000 erythrocytes). Some basic water physicochemical parameters were recorded to search for fluctuations matching the ENMAs. Overall, the most frequent nucleus abnormality was the polymorphic type, sequentially followed by the blebbed/ lobed/notched, segmented, kidney shaped, vacuolated, MN and binucleated. The total average frequency of the ENMAs ranged from 73‰ in the Mondego to 108‰ in the Ave. The polymorphic type was typically ≥50 % of the total ENMAs, averaging about 51‰, when considering all three estuaries. The most serious lesion-the MN-in fish from Mondego and Douro had a similar frequency (≈0.38‰), which was significantly lower than that in the Ave (0.75‰). No significant seasonal differences existed as to the MN rates and seasonal differences existed almost only in the Douro, with the higher values in AW. In general, the pattern of ENMAs frequencies was unrelated with the water physicochemical parameters. Considering the data for both the total ENMAs and for each specific abnormality, and bearing in mind that values of MN in fish erythrocytes >0.3‰ usually reflect pollution by genotoxicants, it is suggested that mullets were likely being chronically exposed to such compounds, even in the allegedly less polluted ecosystem (Mondego). Moreover, data supported the following pollution

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Section: Introductionmentioning

confidence: 99%

Frequency of micronuclei and of other nuclear abnormalities in erythrocytes of the grey mullet from the Mondego, Douro and Ave estuaries—Portugal

Carrola

Santos

Rocha

et al. 2014

Environ Sci Pollut Res

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“…Recent studies showed a substantial anthropogenic metal contamination in the Douro estuary (Mucha et al 2004;Ramalhosa et al 2005;Magalhães et al 2007), probably derived from emissions from the city of Porto through sewage, agricultural waste or due to the extensive river use by tourism and commercial boats (Netzband 2006). Additionally, near the Matosinhos area there is also the Leça river, which drains directly into the fishing port (Porto de Leixões).…”

Section: Discussionmentioning

confidence: 99%

Discrimination ofTrisopterus luscusstocks in northern Portugal using otolith elemental fingerprints

Silva

Santos

Correia

2011

Aquat. Living Resour.

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-The pout, Trisopterus luscus, is one of the most important gadoid fish captured by northern Portuguese traditional fisheries. In spite of a substantial decrease in fish catches, little data are available either on the population structure or on the management of the species. In this study, chemical analysis with inductively coupled plasma mass spectrometry of whole otoliths of 90 pouts (age group 2, total length: 17.9-25.0 cm) provided location-specific elemental signatures. Sampling took place in shallow waters along the coastline in three fishing grounds off the Portuguese north coast (Viana do Castelo, Matosinhos and Aveiro) between February and March 2010. Otolith fingerprint analysis detected the presence of several informative trace elements. Molar concentrations for each site were analysed through uni-and multivariate statistical tests. Strontium, barium, magnesium and lithium (Sr, Ba, Mg and Li) differed significantly among locations, while no significant differences were found for manganese (Mn) and nickel (Ni). Canonical analysis allowed us to discriminate the tested individuals with respect to their sampling origin with a mean classification accuracy of 69%. The observed site-specific elemental differences in pout otoliths suggest a high level of site-fidelity in relation to their growing/feeding areas. Pouts from these locations can be regarded as a single, although not necessary homogenous, stock. Furthermore, this study also suggests that the populations of juvenile fish mix partially and, therefore, cannot be assumed to be separate units for fisheries management purposes.

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“…The distribution of suspended particulate matter (SPM) (Table 1) in coastal and estuarine environments has a major influence on biogeochemical processes (e.g., phytoplankton blooms) (Guinder et al, 2009), ecosystem structure (e.g., food web) (Dalu et al, 2016) and dispersion of pollutants (e.g., copper, mercury, polycyclic aromatic hydrocarbons) (Ma et al, 2002;Ramalhosa et al, 2005). Light absorption by suspended particulates is essential for several photochemical processes related to the carbon cycle (e.g., photosynthesis, production of dissolved inorganic and organic carbon) (Estapa et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Optical properties of size fractions of suspended particulate matter in littoral waters of Québec

Mohammadpour

Gagné

Larouche³

et al. 2017

Biogeosciences

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Abstract. Mass-specific absorption (a i * (λ)) and scattering (b i * (λ)) coefficients were derived for four size fractions (i = 0.2-0.4, 0.4-0.7, 0.7-10, and > 10 µm, λ = wavelength in nm) of suspended particulate matter (SPM) and with samples obtained from surface waters (i.e., 0-2 m depth) of the Saint Lawrence Estuary and Saguenay Fjord (SLE-SF) during June of 2013. For the visible-near-infrared spectral range (i.e., λ = 400-710 nm), mass-specific absorption coefficients of total SPM (i.e., particulates > 0.2 µm) (hereafter a SPM * ) had low values (e.g., < 0.01 m 2 g −1 at λ = 440 nm) in areas of the lower estuary dominated by particle assemblages with relatively large mean grain size and high particulate organic carbon and chlorophyll a per unit of mass of SPM. Conversely, largest a SPM * values (i.e., > 0.05 m 2 g −1 at λ = 440 nm) corresponded with locations of the upper estuary and SF where particulates were mineral-rich and/or their mean diameter was relatively small. The variability of two optical proxies (the spectral slope of particulate beam attenuation coefficient and the mass-specific particulate absorption coefficient, hereafter γ and Svis, respectively) with respect to changes in particle size distribution (PSD) and chemical composition was also examined. The slope of the PSD was correlated with b i * (550) (Spearman rank correlation coefficient ρ s up to 0.37) and a i * (440) estimates (ρ s up to 0.32) in a comparable way. Conversely, the contribution of particulate inorganic matter to total mass of SPM (F SPM PIM ) had a stronger correlation with a i * coefficients at a wavelength of 440 nm (ρ s up to 0.50). The magnitude of γ was positively related to F SPM i or the contribution of size fraction i to the total mass of SPM (ρ s up to 0.53 for i = 0.2-0.4 µm). Also, the relation between γ and F SPM PIM variability was secondary (ρ s = −0.34, P > 0.05). Lastly, the magnitude of Svis was inversely correlated with a SPM * (440) (ρ s = −0.55, P = 0.04) and F SPM PIM (ρ s = −0.62, P = 0.018) in sampling locations with a larger marine influence (i.e., lower estuary).

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Mercury distribution in Douro estuary (Portugal)

Cited by 24 publications

References 17 publications

Frequency of micronuclei and of other nuclear abnormalities in erythrocytes of the grey mullet from the Mondego, Douro and Ave estuaries—Portugal

Frequency of micronuclei and of other nuclear abnormalities in erythrocytes of the grey mullet from the Mondego, Douro and Ave estuaries—Portugal

Discrimination ofTrisopterus luscusstocks in northern Portugal using otolith elemental fingerprints

Optical properties of size fractions of suspended particulate matter in littoral waters of Québec

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