MÔNICA ANGÉLICA VARELLA PETTI
3 resultados
Resultados de Busca
Agora exibindo 1 - 3 de 3
Artigo IPEN-doc 20194 Biomagnification of mercury through the food web of the Santos continental shelf, subtropical Brazil2014 - MUTO, ELISABETI Y.; SOARES, LUCY S.H.; SARKIS, JORGE E.S.; HORTELLANI, MARCOS A.; PETTI, MONICA A.V.; CORBISIER, THAIS N.This study was conducted on the continental shelf surrounding a large metropolitan region on the coast of São Paulo State, Southeast Brazil. This region harbours a large industrial plant and the largest port in Latin America, both of which release pollutants into the Santos−São Vicente estuarine system. High levels of Hg have been reported in sediments and fish from the estuaries and Santos Bay; however, data for the biota in offshore waters are scarce, and the biomagnification of Hg across the food web here has never been assessed. In this study, the trophic structure of the Santos shelf was addressed through the carbon and nitrogen stable isotope compositions of different species across a trophic gradient. We determined the total Hg levels (THg, dry weight) of invertebrates and fish to estimate the rate of biomagnification of this metal in the benthic and pelagic food webs. The lowest mean THg levels were found in zooplankton (0.006 µg g−1) and surface-depositivore polychaetes (0.011 µg g−1); the highest THg levels were found in the largest fishes: Patagonian flounder (0.825 µg g−1), fat snook (0.714 µg g−1), and lesser guitarfish (0.639 µg g−1). Overall, the Hg concentration in fish was below the recommended limit for human consumption. The THg and δ15N were positively correlated in both food webs; however, the rate of biomagnification was higher and the basal Hg was lower in the pelagic food web. These differences may be related to the differing bioavailability of mercury in water and sediment, the higher diversity of prey and more complex feeding interactions in the benthic food web, and metabolic differences among different taxa.Artigo IPEN-doc 16424 Biomagnificação de mercúrio na teia trófica marinha da Baixada Santista (SP)2011 - MUTO, E.Y.; SOARES, L.S.H.; SARKIS, J.E.S.; HORTELLANI, M.A.; PETTI, M.A.V.; CORBISIER, T.N.Artigo IPEN-doc 20018 Integrated quality assessment of sediments from harbour areas in Santos-São Vicente Estuarine system, Southern Brazil2013 - BURUAEM, LUCAS M.; CASTRO, ITALO B. de; HORTELLANI, MARCOS A.; TANIGUCHI, SATIE; FILLMANN, GILBERTO; SASAKI, SILVIO T.; PETTI, MONICA A.V.; SARKIS, JORGE E. de S.; BICEGO, MARCIA C.; MARANHO, LUCIANE A.; DAVANSO, MARCELA B.; NONATO, EDMUNDO F.; CESAR, AUGUSTO; COSTA-LOTUFO, LETICIA V.; ABESSA, DENIS M. de S.Santos-São Vicente Estuarine System is a highly populated coastal zone in Brazil and where it is located the major port of Latin America. Historically, port activities, industrial and domestic effluents discharges have constituted the main sources of contaminants to estuarine system. This study aimed to assess the recent status of sediment quality from 5 zones of Port of Santos by applying a lines-of-evidence approach through integrating results of: (1) acute toxicity of whole sediment and chronic toxicity of liquid phases; (2) grain size, organic matter, organic carbon, nitrogen, phosphorus, trace metals, polycyclic aromatic hydrocarbons, linear alkylbenzenes and butyltins; (3) benthic community descriptors. Results revealed a gradient of increasing contamination for metals and organic compounds, alongside with their geochemical carriers. Sediment liquid phases were more toxic compared to whole sediment. Low number of species and individuals indicated the impoverishment of benthic community. The use of sitespecific sediment quality guidelines was more appropriate to predict sediment toxicity. The integration of results through Sediment Quality Triad approach and principal component analysis allowed observing the effects of natural stressors and dredging on sediment quality and benthic distribution. Even with recent governmental efforts to control, pollution is still relevant in Port of Santos and a threat to local ecosystems.