Bacterioplankton abundance, biomass and production in a Brazilian coastal lagoon and in two German lakes

Anais da Academia Brasileira de Ciências

AndrÉ L. S. Furtado²  Peter Casper¹  Francisco A. Esteves² 

[1] ,Universidade Federal do Rio de Janeiro I.B. Departamento de EcologiaRio de Janeiro,Brazil

关键词: bacterial production;    leucine incorporation;    tropical lagoon;    temperate lake;    produção bacteriana;    incorporação de leucina;    lagoa tropical;    lagos temperados;   

DOI  :  10.1590/S0001-37652001000100005

来源: SciELO

【 摘 要 】

The bacterioplanktonic abundance, biomass, and production within a tropical lagoon (Cabiúnas, Brazil) and two temperate lakes (Stechlin and Dagow, Germany) were compared. Bacterial abundance and production were significantly different among the three water bodies. The lowest bacterial production ( 0.8mug C l-1 d-1) was observed in the tropical Cabiúnas Lagoon despite its higher mean temperature and dissolved organic carbon concentration. Highest bacterioplankton abundance ( 2.6 x 10(9) cells l-1) and production ( 68.5mug C l-1 d-1) were measured in eutrophic Lake Dagow. In oligotrophic Lake Stechlin, the lowest bacterial biomass ( 48.05mug C l-1) was observed because of lower bacterial biovolume ( 0.248mum³) and lower bacterial abundance. Bacterial populations in the temperate lakes show higher activity (production/biomass ratio) than in the tropical lagoon. The meaning of isotopic dilution and leucine incorporation by non-bacterial micro-organisms were evaluated in the oligotrophic temperate system. Leucine uptake by non-bacterial micro-organisms did not have significant influence on bacterial production.

【 授权许可】

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