The ecological niche of the consortium " Pelochromatium roseum "

Overmann, Jörg, Tuschak, Christian, Fröstl, Jürgen M. and Sass, Henrik ORCID: https://orcid.org/0000-0001-8740-4224 1998. The ecological niche of the consortium " Pelochromatium roseum ". Archives of Microbiology 169 (2) , pp. 120-128. 10.1007/s002030050551

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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 μmol quanta m–2 s–1) and low sulfide concentrations (0–100 μM). In dialysis cultures of “P. roseum”, bacterial cells remained in a stable association only when incubated at light intensities between 5 and 10 μmol 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, and (3) phototrophic growth of consortia can be explained only by a cycling of sulfur species in the chemocline, possibly within the consortia themselves.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Earth and Environmental Sciences
Subjects:	Q Science > QR Microbiology
Uncontrolled Keywords:	Phototrophic consortia; Green sulfur; bacteria; Chlorobiaceae; “Chlorochromatium”; “Pelochromatium”; Syntrophy; Sulfur cycle
Publisher:	Springer
ISSN:	0302-8933
Last Modified:	18 Oct 2022 12:19
URI:	https://orca.cardiff.ac.uk/id/eprint/9320

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