Respostas ionoregulatórias do tambaqui, colossoma macropomum, ao petróleo e sua dispersão química
The aim of this work was to assess the effect of crude petroleum and crude petroleum chemically dispersed on the ionic regulation in juvenile of tambaqui, Colossoma macropomum. The exploitation of petroleum in the Solimões River sedimentary basin has increased the risk of contamination of the Amazo...
| Autor principal: | Duarte, Rafael Mendonça |
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| Grau: | Dissertação |
| Idioma: | por |
| Publicado em: |
Instituto Nacional de Pesquisas da Amazônia - INPA
2020
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| Acesso em linha: |
https://repositorio.inpa.gov.br/handle/1/11280 http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4765431Z9 |
| Resumo: |
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The aim of this work was to assess the effect of crude petroleum and crude petroleum chemically dispersed on the ionic regulation in juvenile of tambaqui, Colossoma
macropomum. The exploitation of petroleum in the Solimões River sedimentary basin has increased the risk of contamination of the Amazonian water bodies. Dispersants are chemical substances used in the reduction of the impact caused by the spill of petroleum in water bodies, however, the use of dispersants has not been recommended since it increases the oil toxicity to aquatic organisms. Our results show that hydrocarbons chemically dispersed are able to act at the gill level, changing permeability and modifying the mechanisms of ion transport through the membrane in tambaqui, resulting
in net losses (Jnet) of Na+, K+, and Cl-, particularly, during the first hours of exposure. Unidirectional Influx (Jin) and efflux (Jout) of Na+ changed after exposure to petroleum chemically dispersed (OC+DIS), with diffusive losses (p <0.05) in the two concentrations tested of the dispersant Corexit 9500®. The influx of Na+ showed different responses to the petroleum chemically dispersed. It increased at the higher dispersant concentration (1:1000), and was inhibited at lower concentration (1:1200). However, tambaqui showed
ability to reduce ion gill permeability, decreasing the net losses (Jnet) of Na+, K+, and Clafter 24 hours of exposure, except in the higher dispersant concentration (1:1000) where
losses of K+ stayed increased (p <0.05) throughout the experimental period. The plasmatic content of the major ions (Na+, K+, Ca2+, Mg2+, Cl-), some respiratory parameters, as the hematocrit and the hemoglobin concentration, and parameters of stress, as the concentration of glucose, only showed minor responses to the petroleum chemically dispersed. Concentration were reduced, hemoglobin concentration and plasma Na+, Ca2+, and Cl-, hematocrit and plasma K+ concentration were increased, while plasma glucose concentration changed along the experimental period. |