Caracterização sedimentar e ambiental do estuário do Rio Potengi-RN e sua plataforma adjacente utilizando foraminíferos bentônicos como ferramenta auxiliar
Benthic foraminifera are widely used as environmental bioindicators, especially in environments with high levels of pollution and anthropogenic interaction. We colleceted 59 sediment samples through Van Veen grab sampler, as well as physical-chemical data from the water column using the CTD (conduct...
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| Tipo de recurso: | tesis de maestría |
| Estado: | Versión publicada |
| Fecha de publicación: | 2018 |
| País: | Brasil |
| Institución: | Universidade Federal do Rio Grande do Norte (UFRN) |
| Repositorio: | Repositório Institucional da UFRN |
| Idioma: | portugués |
| OAI Identifier: | oai:repositorio.ufrn.br:123456789/25295 |
| Acceso en línea: | https://repositorio.ufrn.br/jspui/handle/123456789/25295 |
| Access Level: | acceso abierto |
| Palabra clave: | Estuário Potengi Plataforma interna Foraminífero bentônico CNPQ::CIENCIAS EXATAS E DA TERRA::GEOCIENCIAS::GEOFISICA |
| Sumario: | Benthic foraminifera are widely used as environmental bioindicators, especially in environments with high levels of pollution and anthropogenic interaction. We colleceted 59 sediment samples through Van Veen grab sampler, as well as physical-chemical data from the water column using the CTD (conductivity, temperature and depth) equipment. The objective is the sedimentary and environmental characterization of the Potengi River estuary and the adjacent inner continental shelf of Rio Grande do Norte4. The study area is located between Presidente Costa e Silva and Nilton Navarro bridges, while the continental shelf area is located between the beaches of Mãe Luiza in the south and Redinha Nova in the north, approximately 10 km from the coast. Granulometry, carbonate and organic matter contents analyzes, besides the benthic foraminiferal classification were studied. Sedimentary facies, carbonate and organic matter contents, PCA (Principal Component analysis), Cluster and foraminifera data show that the area can be divided into three parts. First part is the estuary, where fine to medium sands predominate, and foraminiferal assemblages show evidence of some pollution in the river channel. The second part is the central portion of the inner shelf, which has carbonate sedimentation and a great abundance of foraminifera. The third part is also located on the inner shelf, but has siliciclastic sediments and low abundance of foraminifera. It was observed that Amonnia tepida are predominant in the estuary and Quinqueloculina lamarckiana in the shelf. The abundance of Amonnia tepida and the low concentration of the other species in the estuarine region revealed a high stress environment. |
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