Abstract
Bacteria were counted with acridine orange epifluorescence technique in two humic lakes during 3 years. Less than 1% of the cells were found attached to detritus aggregates. 73% of the total number and 48% of the total volume were smaller than 1 µm. The mean cell volume ranged from 0.10 to 0.35 µm3 with the highest cell volumes occurring during early summer contemporarily with the growth of the bacterial biomass and probably indicating favourable growth conditions. The mean density of bacteria in oligotrophic brown-water lakes is higher than in oligotrophic clear-water lakes. The development of bacterial biomass showed a regular and seasonally dependent pattern with maxima during early summer and autumn. The importance of different factors for the regulation of bacterial biomass is discussed. Three different approaches were used to estimate bacterial production. These resulted in an average production rate of 15–60 µg C • 1-1 • d-1 during the growing season. It was concluded that allochthonous sources comprised a significnat part of the energy supply to the bacteria in the two humic lakes.
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Johansson, JÅ. (1983). Seasonal development of bacterioplankton in two forest lakes in central Sweden. In: Forsberg, C., Johansson, JÅ. (eds) Forest Water Ecosystems. Developments in Hydrobiology, vol 13. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-7284-1_9
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DOI: https://doi.org/10.1007/978-94-009-7284-1_9
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