PMID: 9446683Mar 27, 1998Paper

The ecological niche of the consortium "Pelochromatium roseum"

Archives of Microbiology
J OvermannJ M Fröstl

Abstract

A dense accumulation of the phototrophic consortium "Pelochromatium roseum" in a small, eutrophic, freshwater lake (Dagowsee, Brandenburg, Germany) was investigated. Within the chemocline, the number of epibionts of the consortia represented up to 19% of the total number of bacteria. Per "P. roseum" a mean value of 20 epibionts was determined. Similar to other aquatic habitats, consortia in the Dagowsee were found only at low light intensities (< 7 &mgr;mol quanta m-2 s-1) and low sulfide concentrations (0-100 &mgr;M). In dialysis cultures of "P. roseum", bacterial cells remained in a stable association only when incubated at light intensities between 5 and 10 &mgr;mol quanta m-2 s-1. Intact consortia from natural samples had a buoyant density of 1046.8 kg m-3, which was much higher than that of ambient chemocline water (995.8 kg m-3). Under environmental conditions and without motility, this density difference would result in rapid sedimentation of consortia toward the lake bottom. Our results indicate that (1) consortia are adapted to a very narrow regime of light intensities and sulfide concentrations, (2) motility and tactic responses must be of ecological significance for the colonization of the free water column of lakes,...Continue Reading

Citations

Jun 12, 2012·International Journal of Systematic and Evolutionary Microbiology·Hong ChenJörg Overmann
Jan 10, 2012·International Journal of Systematic and Evolutionary Microbiology·Hong ChenJörg Overmann
Sep 7, 2001·Annual Review of Microbiology·H N Schulz, B B Jorgensen
May 5, 2005·FEMS Microbiology Letters·Roland Thar, Michael Kühl
Dec 2, 2017·Annals of the New York Academy of Sciences·Kristina Linnea Hillesland
Jul 1, 2003·FEMS Microbiology Ecology·Alke BrunsJörg Overmann
Mar 18, 2008·Journal of Bacteriology·Gerhard WannerJörg Overmann
Aug 6, 2004·Applied and Environmental Microbiology·Jens Glaeser, Jörg Overmann
Jul 4, 2003·Applied and Environmental Microbiology·Jens Glaeser, Jörg Overmann
Nov 5, 2005·Applied and Environmental Microbiology·Birgit E M KanzlerJörg Overmann

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