Bacterioplankton features and its relations with doc characteristics and other limnological variables in Paraná river floodplain environments (PR/MS-Brazil)

Brazilian Journal of Microbiology

Mariana Carolina Teixeira²  Natália Fernanda Santana²  Júlio César Rodrigues De Azevedo¹  Thomaz Aurélio Pagioro² 

[1] ,Universidade Estadual de MaringáMaringá PR ,Brasil

关键词: DOC;    spectroscopy;    bacterioplankton;    floodplain;   

DOI  :  10.1590/S1517-83822011000300008

来源: SciELO

【 摘 要 】

Since the introduction of the Microbial Loop concept, many studies aimed to explain the role of bacterioplankton and dissolved organic carbon (DOC) in aquatic ecosystems. Paraná River floodplain system is a very complex environment where these subjects were little explored. The aim of this work was to characterize bacterial community in terms of density, biomass and biovolume in some water bodies of this floodplain and to verify its temporal variation and its relation with some limnological variables, including some indicators of DOC quality, obtained through Ultraviolet-visible (UV-VIS) and fluorescence spectroscopic analysis. Bacterial density, biomass and biovolume are similar to those from other freshwater environments and both density and biomass were higher in the period with less rain. The limnological and spectroscopic features that showed any relation with bacterioplankton were the concentrations of N-NH4 and P-PO4, water transparency, and some indicators of DOC quality and origin. The analysis of these relations showed a possible competition between bacterioplankton and phytoplankton for inorganic nutrients and that the DOC used by bacterioplankton is labile and probably from aquatic macrophytes.

【 授权许可】

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