17 documents found, page 1 of 2
Improving cost-efficiency for MPs density separation by zinc chloride reuse
Rodrigues, M. O.; Gonçalves, Ana M. M.; Gonçalves, F. J. M.; Abrantes, N.The methodology used to extract and quantify microplastics (MPs) in aquatic systems are still not standardized. Salt saturated solutions, such as sodium chloride (NaCl), zinc chloride (ZnCl2) and/or sodium iodide (NaI), are normally added to separate dense plastics from aquatic samples. However, the most effective reagents are also the most expensive (e.g. ZnCl2 and NaI). To decrease this cost, a reuse process ...
Improving cost-efficiency for MPs density separation by zinc chloride reuse
Rodrigues, M. O.; Gonçalves, A. M. M.; Gonçalves, F. J. M.; Abrantes, N.The methodology used to extract and quantify microplastics (MPs) in aquatic systems are still not standardized. Salt saturated solutions, such as sodium chloride (NaCl), zinc chloride (ZnCl2) and/or sodium iodide (NaI), are normally added to separate dense plastics from aquatic samples. However, the most effective reagents are also the most expensive (e.g. ZnCl2 and NaI). To decrease this cost, a reuse process ...
Sensitivity of freshwater species under single and multigenerational exposure t...
Venancio, C.; Castro, Bruno B.; Ribeiro, R.; Antunes, S. C.; Abrantes, N.; Soares, A. M. V. M.; Lopes, I.Salinization of coastal freshwater ecosystems is already occurring in some regions of the world. This phenomenon raises serious concerns on the protection of coastal freshwater ecosystems, since many of them support and shelter a large number of species and are considered hotspots of biodiversity. This work intended to assess the adverse effects that salinization, caused by the intrusion of seawater (SW), may p...
Environmental benchmarks based on ecotoxicological assessment with planktonic s...
Vidal, T.; Santos, J.I.; Queirós, L.; Ré, A.; Abrantes, N.; Gonçalves, F. J. M.; Pereira, J. L.Freshwater ecosystems face widespread diffuse and point-source contamination. Species Sensitivity Distributions (SSDs) have been used as a tool to determine chemical concentration benchmarks that represent protective levels for most species in the environment. Here we used a SSD approach to assess on the adequacy of standard planktonic organisms to reflect the response of benthic communities, critically support...
Concentration and timing of application reveal strong fungistatic effect of teb...
Cuco, A. P.; Santos, J. I.; Abrantes, N.; Gonçalves, F.; Castro, Bruno B.Given the importance of pollutant effects on host-parasite relationships and disease spread, the main goal of this study was to assess the influence of different exposure scenarios for the fungicide tebuconazole (concentration × timing of application) on a Daphnia-microparasitic yeast experimental system. Previous results had demonstrated that tebuconazole is able to suppress Metschnikowia bicuspidata infection...
Effects of dietary exposure to herbicide and of the nutritive quality of contam...
Silva, M. Bessa da; Abrantes, N.; Rocha-Santos, T.A.P.; Duarte, A.C.; Freitas, A.C.; Gomes, A.M; Carvalho, A.P.; Marques, J.C.; Gonçalves, F.Risk assessment of pesticides has been based on direct toxic effects on aquatic organisms. Indirect effects data are taken into account but with limitations, as it is frequently difficult to predict their real impacts in the ecosystems. In this context the main aim of this work was to assess how the exposure to the herbicide pendimethalin (Prowl®), under environmentally relevant concentrations, may compromise t...
Impacts of climate and land use changes on the hydrological and erosion process...
Serpa, D.; Nunes, J.P.; Santos, J.; Sampaio, E.; Jacinto, R.; Veiga, S.; Lima, J.C.; Moreira, M.; Corte-Real, J.; Keizer, J.J.; Abrantes, N.The impacts of climate and land use changes on streamflow and sediment export were evaluated for a humid (São Lourenço) and a dry (Guadalupe) Mediterranean catchment, using the SWAT model. SWAT was able to produce viable streamflow and sediment export simulations for both catchments, which provided a baseline for investigating climate and land use changes under the A1B and B1 emission scenarios for 2071–2100. C...
Effects of dietary exposure to herbicide and of the nutritive quality of contam...
Silva, M. Bessa da; Abrantes, N.; Rocha-Santos, T.A.P.; Duarte, A.C.; Freitas, A.C.; Gomes, Ana M. P.; Carvalho, A.P.; Marques, J.C.; Gonçalves, F.tRisk assessment of pesticides has been based on direct toxic effects on aquatic organisms. Indirect effectsdata are taken into account but with limitations, as it is frequently difficult to predict their real impactsin the ecosystems. In this context the main aim of this work was to assess how the exposure to theherbicide pendimethalin (Prowl®), under environmentally relevant concentrations, may compromise the...
Assessing the ecotoxicity of metal nano-oxides with potential for wastewater tr...
Nogueira, V.; Lopes, I.; Rocha-Santos, T. A. P.; Rasteiro, M. G.; Abrantes, N.; Gonçalves, F.; Soares, A. M. V. M.; Duarte, A. C.; Pereira, R.The rapid development of nanotechnology and the increasing use of nanomaterials (NMs) raise concern about their fate and potential effects in the environment, especially for those that could be used for remediation purposes and that will be intentionally released to the environment. Despite the remarkable emerging literature addressing the biological effects of NMs to aquatic organisms, the existing information...
Post-fire plant diversity and abundance in pine and eucalypt stands in Portugal...
Maia, P.; Keizer, J.; Vasques, A.; Abrantes, N.; Roxo, L.; Fernandes, P.; Ferreira, A.; Moreira, F.This study concerned the mid-term regeneration of the woody understory vegetation of pure and mixed stands of Pinus pinaster Ait. and Eucalyptus globulus Labill. in northern and central Portugal following wildfires in 2005 and 2006. Pine and eucalypt stands are the most widespread and most fire-prone forest types in Portugal. The main aim was to investigate the importance of biogeography, topography, forest typ...