Bacterial growth and DOC consumption in a tropical coastal lagoon

Brazilian Journal of Biology

V. F. Farjalla²  A. Enrich-prast²  F. A. Esteves²  A. C. P. Cimbleris¹ 

[1] ,UFRJ CCS Instituto de BiologiaRio de Janeiro RJ ,Brazil

关键词: bacterioplankton;    DOC consumption;    BGE;    coastal lagoons;    phosphorus and nitrogen colimitation;    bacterioplâncton;    consumo de COD;    eficiência do crescimento bacteriano;    lagoas costeiras;    colimitação por fósforo e nitrogênio;   

DOI  :  10.1590/S1519-69842006000300002

来源: SciELO

【 摘 要 】

The aims of this research were to determine the main limiting nutrient to bacterial growth in Imboassica lagoon, southeastern Brazil, to estimate the percentage of dissolved organic carbon (DOC) available for bacterial growth, and to determine the bacterial growth efficiency (BGE) of natural assemblages. Bacterial growth and DOC consumption were determined in batch culture experiments, in which water samples were supplemented with nitrogen and phosphorus together or separately, or incubated without nutrient additions. When added together, N and P stimulated higher bacterial growth rates and production, as well as higher DOC consumption. The BGEs and DOC consumption rates were strongly dependent on the method used to determine bacterial production. The BGE ranged from 11 to 72%. However, only a minor fraction of bulk DOC was consumed by the planktonic bacteria (from 0.7 to 3.4%). The results suggest that low availability of phosphorus and nitrogen coupled with excess organic carbon was the main factor responsible for the relatively low bacterial utilization of DOC in Imboassica lagoon.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License