01. Universidade Federal Rural de Pernambuco - UFRPE (Sede)
URI permanente desta comunidadehttps://arandu.ufrpe.br/handle/123456789/1
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Resultados da Pesquisa
Item Aplicação da técnica de espectrometria de fluorescência de raios-x por dispersão de energia (EDXRF) para a quantificação de metais pesados em sedimentos de fundo(2025-02-26) Silva, Ingrid Coimbra da; Gomes, Maria José de Filgueiras; França, Elvis Joacir de; http://lattes.cnpq.br/1716496767364751; http://lattes.cnpq.br/0060810526769648; http://lattes.cnpq.br/9997365922939570Estudos recentes do monitoramento dos ecossistemas aquáticos retratam a relevância de tornarem os sedimentos de fundo como objeto de estudo dos impactos de contaminação ambiental por serem acumuladores, processadores e transportadores de metais pesados e espécies contaminantes. Nesse sentido, este presente estudo teve o objetivo de avaliar a aplicabilidade da técnica de Espectrometria de Fluorescência de Raios X por Dispersão de Energia (EDXRF) na quantificação dos elementos químicos Mn, Fe, Ni, Zn, Sr, Ti, Al, Si, K, Ca, V e La e avaliação da qualidade do sedimento a partir dos valores orientadores TEL e PEL de concentração estabelecidos pelo CCME (Canadian Council of Ministers of the Environment) e adotados pela CETESB para os elementos Ni e Zn como possíveis contaminantes em 52 amostras coletadas de 4 perfis de sedimentos originadas da Costa Brasileira, cedidos pela Pesquisa Desenvolvimento Inovação e Ensino (PDIE) ao Centro Regional de Ciências Nucleares do Nordeste (CRCN/NE). A natureza da pesquisa foi do tipo aplicada baseada em uma abordagem quantitativa através das médias aritméticas das concentrações dos metais pesados pelo EDX-720 e materiais de referências certificados (IAEA-SL-1) comparados com valores obtidos e certificados. O tratamento dos dados foi realizado mediante a metodologia de Fernández (2017) e o cálculo de incertezas analíticas com intervalo de 95% de confiança pela metodologia de Costa (2023). De maneira geral, o elemento Ni apresentou valores acima de TEL para a maioria dos pontos analisados, resultando na classificação de qualidade regular dos sedimentos analisados. O metal Zn esteve entre TEL e PEL para a maioria dos pontos coletados, sendo classificada a qualidade do sedimento como ótimo para esse elemento. As concentrações dos demais elementos não apresentam valores guias para comparação. Dessa forma, os objetivos deste trabalho foram atingidos e apresentaram relevância para a justificativa da aplicabilidade da técnica de EDXRF para o estudo de sedimentos de fundo e a importância da avaliação ambiental pela contaminação de metais pesados e seus impactos para os ecossistemas aquáticos causados pela ação antrópica ao longo dos anos.Item A relação entre Carijoa riisei (Cnidaria, Octocorallia) e a comunidade da meiofauna com ênfase em nematoda em dois naufrágios do Atlântico Sul(2019-12-12) Silva, William Johnson da; Guilherme, Betânia Cristina; Gomes, Paula Braga; http://lattes.cnpq.br/3289333472399959; http://lattes.cnpq.br/3131730022364100; http://lattes.cnpq.br/1055946306253948This is the first study that sought to understand the influence that Carijoa riisei has on the meiofauna and nematode community, we start from the hypothesis that the colonies of this octocoral may increase the abundance and/or diversity of the meiofauna in comparison to areas without C.riisei. In addition, we believe that there is a difference in some trophic groups of the nematode community for a particular sedimentary or the structure of the octocoral. Our results indicated that there is a direct and significant relationship between the meiofauna community found in the sediment of the shiwrecks and that associated with the colonies of C. riisei, this pattern was also observed for nematode community. The highest values of abundance as well as diversity and evenness were observed in the octocoral community, it was also possible to verify significant difference between the dry and rainy periods. Trophic groups had a preference for certain habitat, and were also influenced by seasonal variation. In summary, from 839 individuals found, 652 were associated with the octocoral structure, and only 184 in the adjacent sediment. Future information regarding biogeographic patterns and migration indices may contribute significantly to a better understanding of the relationship between organisms as substrate and the fauna living within.Item Efeitos de um processo de engorda de praia sobre a comunidade meiofaunística da zona entre-marés da praia de Candeias (Jaboatão dos Guararapes – PE)(2018) Sena, Luiz Felipe Valença Galiza; Rocha, Clélia Márcia Cavalcanti da; Santos, Érika Cavalcante Leite dos; http://lattes.cnpq.br/1552807658058972; http://lattes.cnpq.br/8971495967943784; http://lattes.cnpq.br/0088518530140540Marine erosion, which is characterized by the retreat of the coastline against the sea, promotes a significant loss of habitat for organisms inhabiting the intertidal zone. At various points along the coast of Pernambuco this erosion is already perceived at moderate to severe levels,and some actions have already been carried out to contain the retreat from the beach line. Recently, a process of containment of the marine erosion in the state of Pernambuco was carried out, aiming first at the most affected areas. This action provided, along a 5.5 km stretch,the widening of the sand strip of the beaches of Barra de Jangadas, Candeias and Piedade by a beach nourishment process. The sedimentary recomposition of these beaches was made through sand dredged from the continental shelf fromadepthof13m.Thisstudyanalyzedtheecologicalsuccessionof meiofaunal organisms (from 0.044 mm to 0.5 mm in size), and the sediments inwhich they live, in the beach of Candeias (Jaboatão dos Guararapes, PE) before and after a process of beach nourishment for up to 90 days after the process.These animals have a biology adapted to the interstitial environment, and can vary according to the variation of the nature and size of the grains. The collections were performed before the beach nourishment, 1 day after, 7, 15, 30, 60 and 90 days after sediment deposition, in the infralittoral and in the intertidal zone. The material was performed in the laboratory through routine techniques for the study of meiofauna, which was identified at high taxonomic levels. This work investigated the effects of this process on the meio fauna community of the beach and its ecological succession, dueto its close relationship with the sediments and their characteristics.It was verified that immediately aftert he process of beach nourishment the sediments were modified, and also the structure of the meio fauna community that colonizes them. This has undergone several changes in its structure, both in species richness and inabundance. Statistical tests showed a tendency to stabilize or even stabilize the community structure in a pattern that is significantly similar to the meiofauna originally existing on the beach. Thus, the results point to a possibility of using meiofauna in environmental biomonitoring programs for coastal engineering actions.