Anais da Academia Brasileira de Ciências
On-line version ISSN 1678-2690
FURTADO, ANDRÉ L. S.; CASPER, PETER and ESTEVES, FRANCISCO A.. Bacterioplankton abundance, biomass and production in a Brazilian coastal lagoon and in two German lakes. An. Acad. Bras. Ciênc. [online]. 2001, vol.73, n.1, pp. 39-49. ISSN 1678-2690. http://dx.doi.org/10.1590/S0001-37652001000100005.
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 ( 0.8mg 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 109 cells l-1) and production ( 68.5mg C l-1 d-1) were measured in eutrophic Lake Dagow. In oligotrophic Lake Stechlin, the lowest bacterial biomass ( 48.05mg C l-1) was observed because of lower bacterial biovolume ( 0.248mm3) 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.
Keywords : bacterial production; leucine incorporation; tropical lagoon; temperate lake.