43 documents found, page 1 of 5
Water quality for bivalve molluscs and consumer safety: application of novel an...
Cravo, Alexandra; Barbosa, Ana; Borlido Oliveira Lima, Maria João; Ferreira, Cristina; Correia, Cátia; Matos, André Filipe; Jacob, José; Caetano, SandraWater quality degradation associated with wastewater discharges compromises the production of marine living resources. Water quality indices (WQIs) are relevant tools for water quality management, but most applications are limited to the suitability of freshwater for drinking. In this study, a novel WQI was developed to assess the effects of urban wastewater treatment plant (WWTP) discharges on the water qualit...
Novel field experiment on alkalinity enhancement in intertidal environments—a t...
Mendes, Isabel Maria de Paiva Pinto; Lübbers, J.; Schönfeld, J.; Baldermann, A.; Carrasco, Rita; Cravo, Alexandra; Gomes, Ana; Grasse, P.One recently proposed approach to reduce atmospheric CO2 concentrations is marine alkalinity enhancement. This technique increases the CO2 uptake capacity of seawater through weathering of fine-grained (mafic) rocks and minerals in marine environments. The weathering process has been extensively tested in laboratory studies and verified by numerical models. Field experiments scaling the CO2 uptake under natural...
Dynamics of CO2, CH4, and N2O in Ria Formosa coastal lagoon (southwestern Iberi...
Sierra, A.; Ortega, T.; Forja, J.; Rodrigues, M.; Cravo, Alexandra; Correia, CátiaA first characterization of greenhouse gases had been carried out to study their role and impact in a productive transitional coastal system of the southern Portugal – Ria Formosa lagoon. To this purpose, the partial pressure of CO2 (pCO2) and the concentration of dissolved CH4 and N2O have been measured. Two surveys were carried out during 2020, at low tide under typical conditions of Spring (March) and end of...
Integrating physical and biogeochemical processes and oceanic exchanges at a co...
Cravo, Alexandra; Jacob, José; Rosa, Alexandra; Correia, CátiaCoastal lagoons are highly productive systems and the quantification of mass fluxes, which is of paramount importance for the sustainable management of these systems, remains poorly studied. In this context, a detailed study was conducted to better understand the exchanges between the productive coastal lagoon Ria Formosa (South-West Europe) and the ocean. The exchanges of water, nutrients, chlorophyll-a and su...
Atlas of environmental risk of water quality for portuguese marinas
Neves, Maria C.; Cravo, AlexandraThis study applies the pressure-state-response (PSR) model to assess the envirenmental risk of marinas along de coast of mainland Portugal.
Fate of microbial contamination in a South European Coastal Lagoon (Ria Formosa...
Caetano, Sandra; Correia, Cátia; Torres, Ana Flor; Matos, André Filipe; Ferreira, Cristina; Cravo, AlexandraAim: Assessment of the fate of microbial contamination driven from treated wastewater disposal at a highly productive zone on a South European coastal lagoon (Ria Formosa). Methods and results: Microbial indicators of contamination (Total coliforms, Escherichia coli and Enterococci) were evaluated monthly during September 2018-September 2020, at three study areas (Faro, Olhão, Tavira) under different wastewater...
Patterns and predictors of phytoplankton assemblage structure in a Coastal Lago...
Lima, Maria João; Barbosa, Ana B.; Correia, Cátia; Matos, André; Cravo, AlexandraPhytoplankton are dominant primary producers and key indicators in aquatic ecosystems. Understanding the controlling factors on the structure of phytoplankton assemblages is fundamental, but particularly challenging at the land–ocean interface. To identify the patterns and predictors of phytoplankton assemblage structure in the Ria Formosa coastal lagoon (south Portugal), this study combined phytoplankton abund...
Understanding the bioaccumulation of pharmaceutical active compounds by clams R...
Cravo, Alexandra; Silva, Sofia; Rodrigues, João; Cardoso, Vítor Vale; Benoliel, Maria João; Correia, Cátia; Coelho, Maria Rosário; Rosa, Maria JoãoTwenty-four pharmaceutical active compounds (PhACs) were evaluated in the soft tissues of clams Ruditappes decussatus exposed along a 1.5-km dispersal gradient of the treated effluent from an urban wastewater treatment plant discharging in Ria Formosa, and compared with those in the marine waters and discharged effluents. The clams were exposed for 1 month, in June-July 2016, 2017 and 2018. PhACs were quantifie...
Unravelling the effects of treated wastewater discharges on the water quality i...
Cravo, Alexandra; Barbosa, A.B.; Correia, C.; Matos, A.; Caetano, S.; Lima, M.J.; Jacob, J.This study aimed to assess the influence of treated wastewater disposal on Ria Formosa coastal lagoon (South Portugal), the largest national producer of bivalve mollusks. Water quality was evaluated at two areas under different wastewater loads and hydrodynamic conditions, using physico-chemical variables, bacterial indicators of contamination, chlorophyll-a concentration, phytoplankton abundance and compositio...
Water quality of a southwest Iberian coastal lagoon: Spatial and temporal varia...
Rosa, Alexandra; Cravo, Alexandra; Correia, Cátia; Jacob, JoséThe present work aims to characterize Ria Formosa water quality considering its spatial, and temporal variability at two scales: short-term (among seasons) and long-term to evaluate its evolution over the past 40 years, by comparing six historical datasets with data obtained in this study. To attain these goals, four field surveys under different seasons and/or weather conditions were conducted between 2017 and...