Evaluation of eutrophication in the Ria Formosa coastal lagoon, Portugal

Newton, Alice; Icely, John; Falcão, Manuela; Nobre, Ângelo; Nunes, João Pedro; Ferreira, J.G.; Vale, Carlos

doi:10.1016/j.csr.2003.06.008

Cited by 177 publications

(92 citation statements)

References 48 publications

(39 reference statements)

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“…Therefore, the calibration and validation of the hydrodynamic object is analysed in this study and based on and at the sea boundaries, were obtained in several works carried out by the Marine Research Institute (Falcão & Vale, 1990;Vale et al, 1992;Falcão & Vale, 1995;Falcão, 1997, Falcão & Vale, 1998MAOT, 2000;Falcão & Vale, 2003;Newton et al, 2004). A study using the full model complexity, including its calibration and validation is currently being carried out and it will be the subject of an upcoming paper.…”

Section: Hydrodynamic and Biogeochemical Modelling Of The Lagunary Symentioning

confidence: 99%

Biogeochemical modelling of Ria Formosa (South Portugal)

et al. 2008

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Obtained results suggest that the river network may have a significant effect on lagoon concentrations, in spite of the relatively low river flows, due to the high ammonium and nitrate loads. Scenarios reflecting increases in lagoon bathymetry through dredging operations suggest an increase in lagoon water washout time with potential impacts on water quality and impacts at a scale of tens of km. The obtained results are being used by the Ria Formosa Natural Park authority for management purposes and may be useful to feedback future updates of the watershed management plans, within the scope of the European Union WaterFramework Directive. The use of a lagoon scale models is therefore justified in this work.2

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Section: Hydrodynamic and Biogeochemical Modelling Of The Lagunary Symentioning

confidence: 99%

Biogeochemical modelling of Ria Formosa (South Portugal)

et al. 2008

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“…In this study, the outline of water surface in Xiangxi Bay was extracted from the Xiangxi River Watershed Digital Elevation Model (DEM, 1: 50,000) under ArcGIS (ArcGIS 8.3,ESRI). Because the sampling sites are limited, the spatial distribution maps of Chl-a and nutrient (Si, PO 4 P, DIN [NH 4 N + NO 2 N + NO 3 N]) were interpolated using the IDW method referenced from the work of Xu et al, (2001) and Newton et al, (2003) with a spatial resolution of 30m × 30m. The concentration of Chl-a was scaled according to different eutrophication scales (Wang et al, 2005): ultra-oligotrophic (<= 1.00 μg/L),…”

Section: Spatial Analysismentioning

confidence: 99%

Spatial analysis for spring bloom and nutrient limitation in Xiangxi bay of three Gorges Reservoir

Han

et al. 2006

Environ Monit Assess

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The spatial and temporal dynamics of physical variables, inorganic nutrients and phytoplankton chlorophyll a were investigated in Xiangxi Bay from 23 Feb. to 28 Apr. every six days, including one daily sampling site and one bidaily sampling site. The concentrations of nutrient variables showed ranges of 0.02-3.20 mg/L for dissolved silicate (Si); 0.06-2.40 mg/L for DIN (NH 4 N + NO 2 N + NO 3 N); 0.03-0.56 mg/L for PO 4 P and 0.22-193.37 μg/L for chlorophyll a, respectively. The concentration of chlorophyll a and inorganic nutrients were interpolated using GIS techniques. The results indicated that the spring bloom was occurred twice in space during the whole monitoring period (The first one: 26 Feb.-23 Mar.; the second one: 23 Mar.-28 Apr.). The concentration of DIN was always high in the mouth of Xiangxi Bay, and PO 4 P was high in the upstream of Xiangxi Bay during the whole bloom period. Si seems no obvious difference in space in the beginning of the spring bloom, but showed high heterogeneity in space and time with the development of spring bloom. By comparing the interpolated maps of chlorophyll a and inorganic variables, obvious consumptions of Si and DIN were found when the bloom status was serious. However, no obvious depletion of PO 4 P was found. Spatial regression analysis could explained most variation of Chl-a except at the begin of the first and second bloom. The result indicated that Si was the factor limiting Chl-a in space before achieved the max area of hypertrophic in the first and second bloom period. When Si was obviously exhausted, DIN became the factor limiting the Chl-a in space.Daily and bidaily monitoring of Site A and B, representing for high DIN: PO 4 P ratio and low DIN:PO 4 P ratio, indicated that the concentration of Si was decreased with times at both site A and B, and the dramatically drop of DIN was found in the end monitoring at site B. Multiple stepwise regression analysis indicated that Si was the most important factor affect the development of spring bloom both at site A and B in time series.

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“…Coastal ecosystems such as Arcachon Bay, are under constant increase of anthropic pressure. The quality of coastal waters has been particularly deteriorated in recent years as the population and human activities have increased (Newton et al, 2003). These areas have become over the years the recipient of many contaminants generated by human activities and are exposed to a wide variety of natural and anthropogenic stressors (Adams, 2005).…”

Section: Introductionmentioning

confidence: 99%

Do Temporal and Spatial Parameters or Lifestyle of the Pacific Oyster Crasssostrea gigas Affect Pollutant Bioaccumulation, Offspring Development, and Tolerance to Pollutants?

et al. 2017

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This study evaluated the vulnerability of early life stages of native oysters (Crassostrea gigas) from the Arcachon Bay (SW, France) to pollutants at risk in the lagoon in particular copper and S-metolachlor. Developmental abnormalities in wild and cultivated oyster D-larvae were investigated during 2 breeding-seasons (2013 and 2014) at different sampling sites and dates. In addition, copper, and metolachlor concentrations were determined both in seawater and in mature oysters. Bioaccumulation of Cu was observed at higher levels in wild than in farmed specimens. Metolachlor was accumulated at much lower levels. After 24 h exposure, significant increases of the percentage of abnormal D-larvae were observed when exposed at 1 µg L −1 of copper or 10 ng L −1 of metolachlor in comparison with the controls whatever the date, the site, and rearing conditions of the genitors. The current study demonstrates that environmental concentrations of copper and metolachlor can induce a significant increase of developmental abnormalities in farmed and wild populations of oysters. However, no significant differences of sensitivity were observed according to temporal, spatial parameters, and lifestyle of genitors. In addition, oyster larvae obtained from the hatchery displayed the same sensitivity to pollutants as larvae from the field, demonstrating their suitability for toxicity assays and water quality monitoring.

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Evaluation of eutrophication in the Ria Formosa coastal lagoon, Portugal

Cited by 177 publications

References 48 publications

Biogeochemical modelling of Ria Formosa (South Portugal)

Biogeochemical modelling of Ria Formosa (South Portugal)

Spatial analysis for spring bloom and nutrient limitation in Xiangxi bay of three Gorges Reservoir

Do Temporal and Spatial Parameters or Lifestyle of the Pacific Oyster Crasssostrea gigas Affect Pollutant Bioaccumulation, Offspring Development, and Tolerance to Pollutants?

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