ASSESSMENT OF THE TROPHIC PROCESSES CONSIDERING DIFFERENT DEPTHS IN A HYPERSALINE LAGOON – ARARUAMA LAGOON –RJ

Authors

  • Cleuza Leatriz Trevisan Universidade Federal Fluminense
  • Murilo de Carvalho Vicente Universidade Federal Fluminense
  • Gabriela Cugler de Pontes Universidade Federal Fluminense
  • Angelo Cezar Borges de Carvalho Universidade Federal Fluminense
  • Teresa Cristina Soares de Mello Guimarães Universidade Federal Fluminense
  • Hellen Medeiros Universidade Federal Fluminense https://orcid.org/
  • Juliana Pontes Universidade Federal Fluminense
  • Julio Cesar Wasserman Universidade Federal Fluminense

DOI:

https://doi.org/10.21715/GB2358-2812.202236001

Abstract

The water quality of the Araruama lagoon has deteriorated at an accelerated pace during the last decades, mainly due to increasing urban occupation. The sewage disposed in the lagoon has increased concentration of nutrients, leading to eutrophication, which may cause episodes of algal blooms and fish mortalities. The objective of this study was to evaluate stratification of the water parameters in a same collection of samples. Water samples of eleven stations along the lagoon were collected at surface, middle and bottom. For each sample, the following parameters were analyzed: Salinity, temperature, pH, Eh, BOD, DO, turbidity, POC, Nitrogen and phosphorus. The hydrodynamic characterization showed that regardless a connection with the ocean, a large part of the lagoon is rather influenced by winds than tides. In general, parameters showed a homogeneous behavior along the water column. The results of DO, BOD confirmed that the lagoon is highly oxygenated. High Phosphorus values, combined with the result of the rates N:P show that P is the limiting factor, promoting elevated primary phytoplanktonic productivity. The concentrations of BOD, Total N and Total P, Chlorophyll-a and Phaeopigments corroborate to it.

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Author Biographies

Cleuza Leatriz Trevisan, Universidade Federal Fluminense

Departamento de Geoquímica

Instituto de Química

Universidade Federal Fluminense

24.020-141 Niterói – RJ, Brasil

Murilo de Carvalho Vicente, Universidade Federal Fluminense

Departamento de Geoquímica

Instituto de Química

Universidade Federal Fluminense

24.020-141 Niterói – RJ, Brasil

Gabriela Cugler de Pontes, Universidade Federal Fluminense

Departamento de Geoquímica

Instituto de Química

Universidade Federal Fluminense

24.020-141 Niterói – RJ, Brasil

Angelo Cezar Borges de Carvalho, Universidade Federal Fluminense

Departamento de Geoquímica

Instituto de Química

Universidade Federal Fluminense

24.020-141 Niterói – RJ, Brasil

Teresa Cristina Soares de Mello Guimarães, Universidade Federal Fluminense

Departamento de Geoquímica

Instituto de Química

Universidade Federal Fluminense

24.020-141 Niterói – RJ, Brasil

Hellen Medeiros, Universidade Federal Fluminense

Network of Environment and Sustainable Development

Universidade Federal Fluminense

24.020-240 Niterói – RJ, Brazil

Juliana Pontes, Universidade Federal Fluminense

Network of Environment and Sustainable Development

Universidade Federal Fluminense

24.020-240 Niterói – RJ, Brazil

Julio Cesar Wasserman, Universidade Federal Fluminense

Departamento de Geoquímica

Instituto de Química

Universidade Federal Fluminense

24.020-141 Niterói – RJ, Brasil

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Published

2022-03-19

How to Cite

Trevisan, C. L., Vicente, M. de C., Pontes, G. C. de ., Carvalho, A. C. B. de ., Soares de Mello Guimarães, T. C., Medeiros, H., Pontes, J., & Wasserman, J. C. (2022). ASSESSMENT OF THE TROPHIC PROCESSES CONSIDERING DIFFERENT DEPTHS IN A HYPERSALINE LAGOON – ARARUAMA LAGOON –RJ. Geochimica Brasiliensis, 36, e–22001. https://doi.org/10.21715/GB2358-2812.202236001