caa a22 4500 397552734 CHVBK 20180308164754.0 cr unu---uuuuu 161202e199603 xx s 000 0 eng 10.1111/j.1574-6941.1996.tb00207.x doi (NATIONALLICENCE)oxford-10.1111/j.1574-6941.1996.tb00207.x Coexistence of aerobic chemotrophic and anaerobic phototrophic sulfur bacteria under oxygen limitation [Elektronische Daten] [Frank P. van den Ende, Anniet M. Laverman, Hans van Gemerden] The aerobic chemotrophic sulfur bacterium Thiobacillus thioparus T5 and the anaerobic phototrophic sulfur bacterium Thiocapsa roseopersicina M1 were co-cultured in continuously illuminated chemostats at a dilution rate of 0.05 h−1. Sulfide was the only externally supplied electron donor, and oxygen and carbon dioxide served as electron acceptor and carbon source, respectively. Steady states were obtained with oxygen supplies ranging from non-limiting amounts (1.6 mol O2 per mol sulfide, resulting in sulfide limitation) to severe limitation (0.65 mol O2 per mol sulfide). Under sulfide limitation Thiocapsa was competitively excluded by Thiobacillus and washed out. Oxygen/sulfide ratios between 0.65 and 1.6 resulted in stable coexistence. It could be deduced that virtually all sulfide was oxidized by Thiobacillus. The present experiments showed that Thiocapsa is able to grow phototrophically on the partially oxidized products of Thiobacillus. In pure Thiobacillus cultures in steady state extracellular zerovalent sulfur accumulated, in contrast to mixed cultures. This suggests that a soluble form of sulfur at the oxidation state of elemental sulfur is formed by Thiobacillus as intermediate. As a result, under oxygen limitation colorless sulfur bacteria and purple sulfur bacteria do not competitively exclude each other but can coexist. It was shown that its ability to use partially oxidized sulfur compounds, formed under oxygen limiting conditions by Thiobacillus, helps explain the bloom formation of Thiocapsa in marine microbial mats. © 1996 Federation of European Microbiological Societies. All rights reserved Thiobacillus nationallicence Thiocapsa nationallicence Oxygen limitation nationallicence Sulfide oxidation nationallicence Marine microbial mat nationallicence van den Ende Frank P. Department of Microbiology, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands aut Laverman Anniet M. Department of Microbiology, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands aut van Gemerden Hans Department of Microbiology, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands aut FEMS Microbiology Ecology Blackwell Publishing Ltd 19/3(1996-03), 141-151 19:3<141 1996 19 femsec https://doi.org/10.1111/j.1574-6941.1996.tb00207.x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1111/j.1574-6941.1996.tb00207.x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- van den Ende Frank P. Department of Microbiology, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands aut NATIONALLICENCE 700 1- Laverman Anniet M. Department of Microbiology, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands aut NATIONALLICENCE 700 1- van Gemerden Hans Department of Microbiology, University of Groningen, Kerklaan 30, 9751 NN Haren, The Netherlands aut NATIONALLICENCE 773 0- FEMS Microbiology Ecology Blackwell Publishing Ltd 19/3(1996-03), 141-151 19:3<141 1996 19 femsec Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford