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

Abstract

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 (0.8µg 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 × 10 9 cells l -1 ) and production (68.5µg C l -1 d -1 ) were measured in eutrophic Lake Dagow. In oligotrophic Lake Stechlin, the lowest bacterial biomass (48.05µg C l -1 ) was observed because of lower bacterial biovolume (0.248µm 3 ) 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.

Blooms of Single Bacterial Species in a Coastal Lagoon of the Southwestern Atlantic Ocean

“…These values clearly exceed microbial production values reported from a Brazilian coastal lagoon (24). Comparable levels of bacterial activity were found in the Santa Rosa Sound (Florida) (66 g C liter Ϫ1 day Ϫ1 ) (10), which is a strait that receives discharges from wastewater treatment plants, and in a eutrophic German lake (68.5 g C liter Ϫ1 day Ϫ1 ) (24). Even higher bacterial production was described for an aquaculture area in Japan (172 g C liter Ϫ1 day Ϫ1 on average) (53).…”

“…Similarly high levels of bacterial activity were observed in the northern zone of the lagoon during the subsequent sampling period (February) (104.6 g C liter Ϫ1 day Ϫ1 ), when this area was reached by a plume of brackish water from the south (Table 1). These values clearly exceed microbial production values reported from a Brazilian coastal lagoon (24). Comparable levels of bacterial activity were found in the Santa Rosa Sound (Florida) (66 g C liter Ϫ1 day Ϫ1 ) (10), which is a strait that receives discharges from wastewater treatment plants, and in a eutrophic German lake (68.5 g C liter Ϫ1 day Ϫ1 ) (24).…”

Organic matter composition in the sediment of three Brazilian coastal lagoons: district of Macaé, Rio de Janeiro (Brazil)

“…It follows that in three Brazilian lagoons studied here a special bacterial community prevails that differs from microbial assemblages common in other lakes. The relatively low abundance and productivity of pelagic bacteria were between 1.0 to 2.3 × 10 9 cells/l and 1.1 to 33.7 µg C/l in Cabiúnas Lagoon (Furtado et al 2001). It remains to be confirmed by future studies if this specific bacterial association is a general feature of lagoonal environments.…”

“…In Cabiúnas Lagoon seasonal variation of water temperature is low -even in winter water is about 20˚C (Furtado et al 2001). Diunsaturated acids were only detected as trace amounts in landward sites, 0-3 cm, of Comprida and Cabiúnas Lagoons.…”

Influence of the bacterioplankton community of a tropical eutrophic lagoon on the bacterial community of its neighbouring ocean

“…Furtado et al 2001), generally using only cultivation-dependent or other conventional methods. As far as we know, there has been only one report of the use of molecular tools to study bacterial communities in urban lagoons (Taketani et al 2003).…”