Aspects of the uptake of dissolved oxygen in Cabiúnas and Imboassica Lagoons (Macaé, RJ)

Brazilian Archives of Biology and Technology

Paulo R. Brum²  Vinicius F. Farjalla²  José F. Gonçalves Jr.¹  Anderson M. Dos Santos²  Maurício T. Pôrto²  Elisa D. R. Vieira¹  Flávia M. Ferreira²  Irineu Bianchini Jr.¹ 

[1] ,Univ. Federal do Rio de Janeiro Instituto de Biologia Programa Pós Grad. EcologiaRio de Janeiro,Brasil

关键词: decomposition;    aerobic mineralization;    dissolved oxygen;    coastal lagoons;    aquatic macrophytes;   

DOI  :  10.1590/S1516-89131999000400008

来源: SciELO

【 摘 要 】

In this work, we describe qualitative and quantitative aspects of the cycling of detritus of aquatic macrophytes and carbohydrates in two coastal lagoons of the northeastern part of the State of Rio de Janeiro. Samples of water of the Imboassica and Cabiúnas lagoons were enriched with sucrose. Samples of water of the Cabiúnas lagoon were also utilized to arrange mineralization chambers with fragments of three species of aquatic macrophytes found in these lagoons (Typha domingensis, Potamogeton stenostachys and Nymphaea ampla). Following that, the bottles were aerated and incubated (in the laboratory) for a period of 8 days. The concentrations of dissolved oxygen, the pH, the electrical conductivity and the temperature were daily measured. The anaerobic processes were inhibited by periodical aeration of the bottles. The results suggested that the mineralization process in Imboassica lagoon was more efficient; in Cabiúnas lagoon the process of immobilization of the organic matter was dominant. In the short term, maximum oxygen uptake occurred in the mineralization of N. ampla, followed by the mineralization of P. stenostachys and of T. domingensis. However, it was estimated that in long term the mineralization of P. stenostachys showed a greater oxygen uptake.

【 授权许可】

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