Navegando por Palavras-chave "Community Ecotoxicology"

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    Impacto da mistura de metais sobre uma comunidade de meiofauna em cenários de aquecimento e acidificação oceânica
    (Universidade Federal de São Paulo (UNIFESP), 2020-08-28) Altafim, Giam Luca [UNIFESP]; Choueri, Rodrigo Brasil [UNIFESP]; Universidade Federal de São Paulo
    Increasing CO2 concentration in the atmosphere gradually warms the planet and acidifies the oceans. The presence of metals in estuarine sediment has been reported in several studies and may affect benthic organisms directly in contact with them. Meiofauna compose most of the biomass of this system, and collaborates with the maintenance of several ecological processes. In this study we sought to observe the relationship between climate change and metal toxicity in the sediment. We exposed the meiofauna in laboratory-controlled microcosms, for two concentrations (M1 and M2) of a mixture of Cu, Zn, Pb and Hg, and their negative control in warmed (26 and 28 °C) and acidified (pH 8,0 and 7,6) environments for 20 days. Meiofauna was characterized according to their density, diversity (Shannon), equitability (Pielou) and multivariate structure. Data analysis were performed by multifactorial PERMANOVA, to observe interactions between temperature, pH and contamination. The multivariate structure of the community was represented through a nMDS. The univariate parameters were affected by the interaction between contamination and temperature, except for the density of Ostracoda and Copepoda affected only by the highest concentration of metals. Nematoda was the group with greatest reduction in overall density in the contaminated microcosms at 28 °C. A significant interaction was noted between Temperature and contamination, and between pH and contamination in the multivariate structure of the community, being possible to observe greater separation between M1 and M2 at pH 7.6 and 26 ° C. It can be concluded that climate change can significantly affect the patterns of response to contamination by metals, requiring the readjustment of sediment quality guidelines, considering climate projections as well as the regional characteristics of each location.