6 documents found, page 1 of 1
Climatology and nutrient fluxes in the Tagus estuary: A coupled model application
de Pablo, Hilda; Sobrinho, João; Nunes, Susana; Correia, Alexandre; Neves, Ramiro; Gaspar, MiguelRivers are responsible for the main transport of nutrients from land to estuaries and coastal areas. Understanding the fate of these anthropogenic inputs and their impacts on estuaries and adjacent marine ecosystems is essential for the protection of coastal waters. Here, the 3D MOHID hydrodynamic model coupled with a biogeochemical model was used to determine seasonal nutrient fluxes between areas of the Tagus...
The influence of the river discharge on residence time, exposure time and integ...
de Pablo, Hilda; Sobrinho, João; Garaboa-Paz, Daniel; Fonteles, Caio; Neves, Ramiro; Gaspar, MiguelUnderstanding how long water is retained in an estuary and how quickly it is completely flushed is essential to estimate an estuary's health in areas with significant pollutant loadings. The present study analyses the effect of five different Tagus River discharge scenarios ranging from low to extreme on residence time (RT), exposure time (ET) and integrated water fractions inside pre-established Tagus estuary ...
Metal accumulation and oxidative stress responses in Ulva spp. in the presence ...
Pereira, Patrícia; de Pablo, Hilda; Guilherme, Sofia; Carvalho, Susana; Santos, Maria Ana; Vale, Carlos; Pacheco, MárioIn aquatic systems under eutrophic conditions, remobilization of metals from sediment to the overlying water may occur. Consequently, adaptive responses of local organisms could result from the accumulation of metals intermittently released from the sediment. In summer 2007, a field transplantation experiment was performed in the Óbidos lagoon (Portugal) with Ulva spp. comprising three short-term exposures (bet...
An investigation on body displacement after two drowning accidents
Mateus, Marcos; de Pablo, Hilda; Vaz, NunoThe finding of human remains in aquatic environments is usually attributed to causes such as workrelated or recreational accidents, suicides, discarded homicide victims, and natural disasters. When the point and date of entry in the water is unknown, these findings pose serious challenges to forensic analysis given the difficulty to estimate the drift of the body. In this context, the information retrieved from...
Environmental quality assessment combining sediment metal levels, biomarkers an...
Pereira, Patrícia; Carvalho, Susana; Pereira, Fábio; de Pablo, Hilda; Gaspar, Miguel B.; Pacheco, Mário; Vale, CarlosMacroinvertebrate benthic communities are one of the key biological components considered for the assessment of benthic integrity in the context of the Water Framework Directive (WFD). However, under moderate contamination scenarios, the assessment of macrobenthic alterations at community level alone could be insufficient to discriminate the environmental quality of coastal and transitional waters. Keeping this...
Daily availability of nutrients and metals in a eutrophic meso-tidal coastal la...
Pereira, Patrícia; de Pablo, Hilda; Carvalho, Susana; Vale, Carlos; Pacheco, MárioThis baseline reports daily variations of physico-chemical parameters, nutrients and metals in water of two sites [eutrophic conditions (BB) versus reference (LL)] in Obidos coastal lagoon (Portugal). Dissolved oxygen in BB varied between 40% saturation levels (night) and 190% (daylight). NH(4)(+), PO(4)(3-) and ratios to Al of Mn, Fe and Pb in suspended particulate matter increased during the period of lower o...