Bacterial population dynamics, production, and heterotrophic activity in a recently formed reservoir

Jugnia, Louis B.; Tadonléké, Rémy D.; Sime-Ngando, Télesphore; Dévaux, Jean; Andrivon, C.

doi:10.1139/cjm-45-9-747

Cited by 4 publications

(11 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Filtration under low vacuum (as done in the present study) for the preparation of the diluent remains of great importance, because this operation could induce cell breakage and enrichment of the experimental samples, and thus increase the apparent microbial growth over that occurring in situ (Ferguson et al, 1984). Bacterial abundances in the Sep Reservoir (1.13-8.48 Â 10 9 cells L À1 ) are typical of oligomesotrophic lakes (Jugnia et al, 1999) and, during this study, were over the range of values of 0.5 to 2 Â 10 9 cells L À1 known to be the feeding threshold prey conditions for the bacterivory response of flagellates in pelagic systems (e.g. under saturated grazing conditions (cf.…”

Section: Estimates Of Bacterial Productionmentioning

confidence: 68%

“…Additional details on the site description can be found in Jugnia et al (1999Jugnia et al ( , 2000a. at a depth of 1 m) of the oligomesotrophic Sep Reservoir, located in the French 'Massif Central', c. 461N, 31E.…”

Section: Study Site and Samplingmentioning

confidence: 99%

“…Two types of fluorescent prey were used separately, natural bacteria [i.e. fluorescently labeled microspheres (FLM)] (Pace & Bailiff, 1987) of similar diameter to the mean size of bacteria in the Sep Reservoir (Jugnia et al, 1999). fluorescently labeled microspheres (FLM)] (Pace & Bailiff, 1987) of similar diameter to the mean size of bacteria in the Sep Reservoir (Jugnia et al, 1999).…”

Section: Bacterial Lossesmentioning

confidence: 99%

“…under saturated grazing conditions (cf. In addition, the bacterial community in the Sep Reservoir is largely dominated by free-living cells (Jugnia et al, 1999). Bacterial abundances in the Sep Reservoir (1.13-8.48 Â 10 9 cells L À1 ) are typical of oligomesotrophic lakes (Jugnia et al, 1999) and, during this study, were over the range of values of 0.5 to 2 Â 10 9 cells L À1 known to be the feeding threshold prey conditions for the bacterivory response of flagellates in pelagic systems (e.g.…”

Section: Estimates Of Bacterial Productionmentioning

confidence: 99%

“…The reservoir contains 4.7 Â 10 6 m 3 of water and has a surface area of 33 ha, with mean and maximum depths of 14 and 37 m, respectively. Additional details on the site description can be found in Jugnia et al (1999Jugnia et al ( , 2000a. Samples were collected biweekly from 13 June to 10 September 1998, from the deepest part of the reservoir.…”

Section: Study Site and Samplingmentioning

confidence: 99%

See 4 more Smart Citations

Dynamics and estimates of growth and loss rates of bacterioplankton in a temperate freshwater system

Jugnia

Sime-Ngando

Gilbert

2006

FEMS Microbiology Ecology

View full text Add to dashboard Cite

The growth rate and losses of bacterioplankton in the epilimnion of an oligo-mesotrophic reservoir were simultaneously estimated using three different methods for each process. Bacterial production was determined by means of the tritiated thymidine incorporation method, the dialysis bag method and the dilution method, while bacterial mortality was assessed with the dilution method, the disappearance of thymidine-labeled natural cells and ingestion of fluorescent bacterial tracers by heterotrophic flagellates. The different methods used to estimate bacterial growth rates yielded similar results. On the other hand, the mortality rates obtained with the dilution method were significantly lower than those obtained with the use of thymidine-labeled natural cells. The bacterial ingestion rate by flagellates accounted on average for 39% of total bacterial mortality estimated by the dilution method, but this value fell to 5% when the total mortality was measured by the thymidine-labeling method. Bacterial abundance and production varied in opposite phase to flagellate abundance and the various bacterial mortality rates. All this points to the critical importance of methodological aspects in the elaboration of quantitative models of matter and energy flows over the time through microbial trophic networks in aquatic systems, and highlights the role of bacterioplankton as a source of carbon for higher trophic levels in the studied system.

show abstract

Section: Estimates Of Bacterial Productionmentioning

confidence: 68%

Section: Study Site and Samplingmentioning

confidence: 99%

Section: Bacterial Lossesmentioning

confidence: 99%

Section: Estimates Of Bacterial Productionmentioning

confidence: 99%

Section: Study Site and Samplingmentioning

confidence: 99%

See 3 more Smart Citations

Dynamics and estimates of growth and loss rates of bacterioplankton in a temperate freshwater system

Jugnia

Sime-Ngando

Gilbert

2006

FEMS Microbiology Ecology

View full text Add to dashboard Cite

show abstract

The microbial food web in the recently flooded sep reservoir: Diel fluctuations in bacterial biomass and metabolic activity in relation to phytoplankton and flagellate grazers

et al. 2000

View full text Add to dashboard Cite

Bacterioplankton dynamics in the Mondego estuary (Portugal)

Nicolau¹,

Nicolau²,

Marques³

et al. 2003

Acta Oecologica

View full text Add to dashboard Cite

In this work, the density of bacterioplankton and environmental parameters were monitored over a 11 month period (July 1999-June 2000, and also during one tidal cycle (15 June 2000), at two sampling stations, in the estuary of River Mondego. These data were treated by multivariate analyses methods in order to identify the key factors that control the dynamics of the bacterioplankton in the estuary. Bacterial dynamics were dominated by temporal gradients (annual seasons and tide-related) and less by the spatial structure of the estuary. Three main metabolic groups of bacterioplankton-aerobic heterotrophic bacteria, sulphate-reducing bacteria (SRB) and nitrate-reducing bacteria (NRB)-involved in the cycling of organic matter, were present in the water column of the estuary. Their relative abundance depended on the particular physical, chemical and biological environment. The abundance of aerobic heterotrophic bacteria, during the 11 month study, was modelled as a function of nitrate (the most important variable, with a negative effect), temperature, salinity and pH (with positive effects). SRB appeared to be limited to the water-sediment interface, where concentrations of sulphate and POM were greater. A competition between SRB and NRB for carbon has also been suggested.

show abstract

Bacterial population dynamics, production, and heterotrophic activity in a recently formed reservoir

Cited by 4 publications

References 0 publications

Dynamics and estimates of growth and loss rates of bacterioplankton in a temperate freshwater system

Dynamics and estimates of growth and loss rates of bacterioplankton in a temperate freshwater system

The microbial food web in the recently flooded sep reservoir: Diel fluctuations in bacterial biomass and metabolic activity in relation to phytoplankton and flagellate grazers

Bacterioplankton dynamics in the Mondego estuary (Portugal)

Contact Info

Product

Resources

About