2018-12-062018-12-062013-02-15DERGAN, Antônio Leonildo Nascimento. Biomarcadores bioquímicos no poliqueta namalycastis abiuma como ferramentas para avaliação da qualidade de locais com distintos históricos de contaminação no estuário Guajarino, Belém (PA). Orientadora: Lílian Lund Amado. 2013. 53 f. Trabalho de Curso (Bacharelado em Oceanografia) – Faculdade de Oceanografia, Instituto de Geociências, Universidade Federal do Pará, Belém, 2013. Disponível em: http://bdm.ufpa.br/jspui/handle/prefix/867. Acesso em:.http://bdm.ufpa.br/jspui/handle/prefix/867Guajará estuary organisms have been suffering an intense stress due proximity to Belém city. Daily, large amounts of untreated anthropogenic compounds are released in this environment.This study aims to evaluate, from a biological point of view, the environmental quality of different sites alongGuajará Bay using the polychaeteNamalycastisabiuma as abiomonitor organism. Study area included Una Channel and Miramar port, which are characterized as organic and metal contaminated sites. GuamáRiver represents the reference site, with a lack of direct contamination. In each site, during a period of 1 and a half year with different climatic stations (dry season, intermediary dry-rainy, rainy season, intermediary rainy-dry and dry season), polychaetes were collected with a Petersen’s dredge. We analyzed the activity of the antioxidant enzymes catalase (CAT) and glutathione S-transferase (GST) and total antioxidant potential (TEAC) as exposure biomarkers and lipoperoxidation (LPO) as effect biomarker. The polychaetes from all sampled points had an increase in total antioxidant potential (TEAC) in rainy season, probably as a response to elevated amount and/or quality of organic matter transported to estuary in this period. A reduction on antioxidant enzymes activity was observed during rainy and rainy-dry seasons in worms from Una (CAT and GST) and Miramar (enzyme CAT) compared to reference organisms. These results can be related to the exhaustion of antioxidant defenses in function to extended exposure to pollutants. The effect of the reduction in these enzymes activities was observed in rainy-dry season, when the polychaetes from both contaminated sites showed higher oxidative damage (LPO) than animals from reference site. Worms collected in Guamá river showed a higher capacity to cope with oxidative insults than organisms from polluted sites. They presented a seasonal increase in exposure biomarkers CAT, GST e TEAC that was also associated with the rainfall levels. These worms exhibited a transient state of elevated lipoperoxidation in the rainy season, which can be related to the augmented oxidative metabolism during this period of higher food availability. We can emphasize that this pioneer study helps to elucidate the biological effects of contamination, particularly on oxidative status of the N. abiumainhabiting contaminated sites, such as the role of rainfall as a major force that potentiates the effects of pollution.Acesso AbertoEstuáriosBiomonitoramentoQualidade ambientalBelém - PAPará - EstadoCNPQ::CIENCIAS EXATAS E DA TERRA::OCEANOGRAFIATrabalho de Curso - Graduação - Monografia