Assimetria flutuante em invertebrados marinhos, oriundos de áreas acometidas pelo petróleo na costa do Rio Grande do Norte em 2019
In the second half of 2019, oil spills of unknown origin reached the Brazilian coast, mainly in the northeast region of the country. Recent analyzes of the compound concluded that it is a highly toxic fuel oil derived from petroleum, especially due to the presence of several Polycyclic Aromatic Hydr...
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| Formato: | bachelorThesis |
| Idioma: | pt_BR |
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Universidade Federal do Rio Grande do Norte
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| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/51334 |
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| Resumo: | In the second half of 2019, oil spills of unknown origin reached the Brazilian coast, mainly in the northeast region of the country. Recent analyzes of the compound concluded that it is a highly toxic fuel oil derived from petroleum, especially due to the presence of several Polycyclic Aromatic Hydrocarbons (PAHs) in its chemical constitution, which are difficult to degrade, that is, they remain in the environment for many years, and tends to bioaccumulate in the food chain. In the state of Rio Grande do Norte, oil hit on the eastern coast, an area with a high occurrence of estuaries, transitional ecosystems between the marine and freshwater environment, characterized by its high biodiversity and vulnerability to environmental disasters. Thus, it is necessary to evaluate the effects caused by oil on the local biota and on the environment, which is the objective of this present research. In the meantime, certain species of crustaceans and molluscs are organisms known for their potential use as indicators of environmental stress, due to their sensitivity to fuel. Here, the crustaceans stand out, the uçá crab (Ucides cordatus) and the seabob shrimp (Xiphopenaeus kroyeri), and the bivalve molluscs shellfish (Anomalocardia flexuosa) and sururu (Mytella strigata). Among the tools used to assess environmental quality, the Floating Asymmetry (FA) stands out for its high sensitivity in detecting variations in the body morphometry of organisms arising from developmental instability that may be associated with environmental stress. Thus, we used the AF methodology to investigate possible contamination in individuals of these invertebrate species collected in areas of the RN affected by oil. Thus, all individuals were photographed and the photos subsequently processed in specific software (eg. tpsDig vs. 2.31; MorphoJ) for marking the anatomical landmarks and performing the Anova Procrustes parametric test to detect significance in the PA values. As a result, we did not find exciting FA values for the uçá crab, but we identified significant values for both remaining bivalve species and for shrimp, evidencing the bioindicator potential of the species and the effectiveness of the FA analysis for environmental impact studies. However, further work must be carried out to establish a quali-quantitative causality between the AF values and the oil spill that occurred in 2019 |
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