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            <title xml:lang="en">Dynamics and estimates of growth and loss rates of bacterioplankton in a temperate freshwater system</title>
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                <term xml:lang="en">COASTAL MARINE-ENVIRONMENT</term>
                <term xml:lang="en">NEWLY FLOODED RESERVOIR</term>
                <term xml:lang="en">BACTERIAL PRODUCTION</term>
                <term xml:lang="en">OLIGOMESOTROPHIC LAKE</term>
                <term xml:lang="en">PROTISTAN BACTERIVORY</term>
                <term xml:lang="en">AQUATIC ENVIRONMENTS</term>
                <term xml:lang="en">GRAZING IMPACT</term>
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                <term xml:lang="en">MORTALITY</term>
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              <p>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.</p>
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