Significance of viral lysis and flagellate grazing as factors controlling bacterioplankton production in a eutrophic lake
Article Abstract:
A study was conducted on the effects of viral lysis and heterotrophic nanoflagellate (HNF) grazing on bacterial mortality in a eutrophic lake. Examination showed that 20.2-29.2% of the bacterial cells were empty and could not contribute to viral production. Estimates of summed mortality values indicated that bacterial production was controlled in the epilimnion and the hypolimnion. In contrast, viral lysis and HNF grazing were not sufficient to control bacterial production in the metalimnion. The estimated contribution of organic matter released by viral lysis of cells was low.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1998
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Distribution and life strategies of two bacterial populations in a eutrophic lake
Article Abstract:
The depth distribution of Comamonas acidovorans PX54 and Aeromonas hydrophila PU7718 in the stratified Lake Plubsee in Germany was studied as well as their life strategies. PX54 populations showed a depth distribution with maximum abundances in the oxic epilimnion while PU7718 showed a depth distribution with maximum abundances in the anoxic thermocline layer. Life strategy characterizations revealed that the PU7718 is an opportunistic population while PX54 is an equilibrium population.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1998
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Utility of green fluorescent nucleic acid dyes and aluminum oxide membrane filters for rapid epifluorescence enumeration of soil and sediment bacteria
Article Abstract:
A study was conducted to test whether novel green fluorescent dyes (GFD) would enhance the visualization of bacteria in soils and sediments. Experimental samples were obtained from a set of diverse soil and sediment habitats using two types of membrane filters. Results indicated that all GFD can be utilized for staining bacteria in soils and sediments. Findings also showed that GFD can be used to determine the size, shape and biomass of cells.
Publication Name: Applied and Environmental Microbiology
Subject: Biological sciences
ISSN: 0099-2240
Year: 1998
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