Urban coastal lagoons subject to anthropic impacts via effluent input: general aspects and the concentration of methane in Lagoa Imboassica, Macaé, RJ

Authors

DOI:

https://doi.org/10.19180/2177-4560.v14n12020p81-97

Keywords:

Methanogenesis, Sediment, Eutrophication, Organic matter, Sewage

Abstract

Coastal lagoons occupy 13% of the planet’s coast. In Brazil, they occur along the entire coast, with emphasis on the states of Rio de Janeiro and Rio Grande do Sul. Due to their geographic location, coastal lagoons are subject to several anthropic impacts. Multidisciplinary actions to mitigate these impacts are essential for changing the current conditions of coastal lagoons on the Brazilian coast. For this, it is necessary to have a better knowledge of the impacts caused and their consequences for the functioning of these ecosystems. Sewage input is one of the environmental impacts and is directly related to the increase in ecosystem productivity. In turn, the higher the aquatic productivity in lentic water, the greater the emission of methane into the atmosphere. In an effort to better understand the influence of eutrophication on the methane cycle, we analyzed the concentration of methane in the sediment in four regions of the Imboassica lagoon that have different environmental characteristics. In each region, 10 cm sediment cores were collected, which were subdivided into five 2 cm profiles. We analyzed the methane concentration in the sediment’s interstitial water in each profile. We observed that the lagoon regions influenced by the sewage supply had the highest concentrations of methane in the sediment. We conclude that sewage treatment is essential to mitigate eutrophication and, consequently, methane production in the ecosystem.

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Author Biographies

  • André Luiz dos Santos Fonseca, Instituto Federal de Educação Ciência e Tecnologia Fluminense
    Doutor em Ecologia e Recursos Naturais pela Universidade Federal de São Carlos. Professor do Instituto Federal de Educação Ciência e Tecnologia Fluminense (IFFluminense, campus Cabo Frio) – Cabo Frio/RJ – Brasil. E-mail:  andrefonsecabio@gmail.com
  • Claudio Cardoso Marinho, Universidade Federal do Rio de Janeiro
    Doutor  em Ciências Biológicas (Biofísica) pela Universidade Federal do Rio de Janeiro (UFRJ) – Rio de Janeiro/RJ – Brasil. E-mail: claudiocardosomarinho@gmail.com.
  • Murilo Minello, Instituto Federal de Educação Ciência e Tecnologia do Rio de Janeiro
    Mestre em Ecologia pela Universidade Federal do Rio de Janeiro. Professor do Instituto Federal de Educação Ciência e Tecnologia do Rio de Janeiro (IFRJ) - Rio de Janeiro/RJ – Brasil. E-mail: murilo.minello@ifrj.edu.br
  • Francisco de Assis Esteves, Universidade Federal do Rio de Janeiro
    Doutor pelo Max-Plack Insitut für Limnologie - Universitat Kiel (Christian-Albrechts). Professor Titular da Universidade Federal do Rio de Janeiro (UFRJ) - Rio de Janeiro/RJ – Brasil. E-mail: festeves@globo.com  

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Published

16-04-2020

Issue

Vol. 14 No. 1 (2020)

Section

Original articles

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How to Cite

Urban coastal lagoons subject to anthropic impacts via effluent input: general aspects and the concentration of methane in Lagoa Imboassica, Macaé, RJ. Boletim do Observatório Ambiental Alberto Ribeiro Lamego, [S. l.], v. 14, n. 1, p. 81–97, 2020. DOI: 10.19180/2177-4560.v14n12020p81-97. Disponível em: https://editoraessentia.iff.edu.br/index.php/boletim/article/view/15353.. Acesso em: 22 jul. 2024.