Vertical gradient of nutrients in two dimictic lakes ? influence of phototrophic sulfur bacteria on nutrient balance

2004 ◽  
Vol 66 (3) ◽  
Author(s):  
Uwe Selig ◽  
Thomas H�bener ◽  
Reinhard Heerkloss ◽  
Hendrik Schubert
Keyword(s):  
Nutrient Balance ◽  
Vertical Gradient ◽  
Phototrophic Sulfur Bacteria ◽  
Sulfur Bacteria

scholarly journals Anoxygenic photo- and chemosynthesis of phototrophic sulfur bacteria from an alpine meromictic lake

2021 ◽  
Author(s):  
Francesco Di Nezio ◽  
Clarisse Beney ◽  
Samuele Roman ◽  
Francesco Danza ◽  
Antoine Buetti-Dinh ◽  
...  
Keyword(s):  
Carbon Fixation ◽  
Meromictic Lake ◽  
Purple Sulfur Bacterium ◽  
Phototrophic Sulfur Bacteria ◽  
Anaerobic Microorganisms ◽  
Sulfur Bacteria ◽  
Pure Cultures ◽  
Chlorobium Phaeobacteroides ◽  
Anoxic Environment ◽  
Dark Carbon Fixation

Abstract Meromictic lakes are interesting ecosystems to study anaerobic microorganisms due their permanent stratification allowing the formation of a stable anoxic environment. The crenogenic meromictic Lake Cadagno harbors an important community of anoxygenic phototrophic sulfur bacteria responsible for almost half of its total productivity. Besides their ability to fix CO2 through photosynthesis, these microorganisms also showed high rates of dark carbon fixation via chemosyntesis. Here, we grew in pure cultures three populations of anoxygenic phototrophic sulfur bacteria previously isolated from the lake, accounting for 72.8% of the total microbial community, and exibiting different phenotypes: 1) the motile, large-celled purple sulfur bacterium (PSB) Chromatium okenii, 2) the small-celled PSB Thiodictyon syntrophicum, and 3) the green sulfur bacterium (GSB) Chlorobium phaeobacteroides. We measured their ability to fix CO2 through photo- and chemo-synthesis, both in situ in the lake and in laboratory under different incubation conditions. We also evaluated the efficiency and velocity of H2S photo-oxidation, an important reaction in the anoxygenic photosynthesis process. Our results confirm that phototrophic sulfur bacteria strongly fix CO2 in the presence of light and that oxygen increases chemosynthesis at night, in laboratory conditions. Moreover, substancial differences were displayed between the three selected populations in terms of activity and abundance.

Biomass composition and methods for the determination of metabolic reserve polymers in phototrophic sulfur bacteria

1994 ◽  
Vol 56 (1) ◽  
pp. 1-15 ◽  
Author(s):  
Claudio Del Don ◽  
Kurt W. Hanselmann ◽  
Raffaele Peduzzi ◽  
Reinhard Bachofen
Keyword(s):  
Biomass Composition ◽  
Phototrophic Sulfur Bacteria ◽  
Sulfur Bacteria ◽  
Metabolic Reserve

scholarly journals A Benthic Gradient Chamber for culturing phototrophic sulfur bacteria on reconstituted sediments

1996 ◽  
Vol 20 (4) ◽  
pp. 237-250 ◽  
Author(s):  
Olivier Pringault ◽  
Rutger Wit ◽  
Pierre Caumette
Keyword(s):  
Phototrophic Sulfur Bacteria ◽  
Sulfur Bacteria

scholarly journals Dynamic cellular complexity of anoxygenic phototrophic sulfur bacteria in the chemocline of meromictic Lake Cadagno

PLoS ONE ◽  
2017 ◽  
Vol 12 (12) ◽  
pp. e0189510 ◽  
Author(s):  
Francesco Danza ◽  
Nicola Storelli ◽  
Samuele Roman ◽  
Samuel Lüdin ◽  
Mauro Tonolla
Keyword(s):  
Meromictic Lake ◽  
Phototrophic Sulfur Bacteria ◽  
Sulfur Bacteria

scholarly journals Community Shift from Phototrophic to Chemotrophic Sulfide Oxidation following Anoxic Holomixis in a Stratified Seawater Lake

2014 ◽  
Vol 81 (1) ◽  
pp. 298-308 ◽  
Author(s):  
Petra Pjevac ◽  
Marino Korlević ◽  
Jasmine S. Berg ◽  
Elvira Bura-Nakić ◽  
Irena Ciglenečki ◽  
...  
Keyword(s):  
Water Column ◽  
Sulfide Oxidation ◽  
Water Layer ◽  
Tight Coupling ◽  
Phototrophic Sulfur Bacteria ◽  
Community Shift ◽  
Sulfur Bacteria ◽  
Microbiological Methods ◽  
Culture Independent ◽  
The Impact

ABSTRACTMost stratified sulfidic holomictic lakes become oxygenated after annual turnover. In contrast, Lake Rogoznica, on the eastern Adriatic coast, has been observed to undergo a period of water column anoxia after water layer mixing and establishment of holomictic conditions. Although Lake Rogoznica's chemistry and hydrography have been studied extensively, it is unclear how the microbial communities typically inhabiting the oxic epilimnion and a sulfidic hypolimnion respond to such a drastic shift in redox conditions. We investigated the impact of anoxic holomixis on microbial diversity and microbially mediated sulfur cycling in Lake Rogoznica with an array of culture-independent microbiological methods. Our data suggest a tight coupling between the lake's chemistry and occurring microorganisms. During stratification, anoxygenic phototrophic sulfur bacteria were dominant at the chemocline and in the hypolimnion. After an anoxic mixing event, the anoxygenic phototrophic sulfur bacteria entirely disappeared, and the homogeneous, anoxic water column was dominated by a bloom of gammaproteobacterial sulfur oxidizers related to the GSO/SUP05 clade. This study is the first report of a community shift from phototrophic to chemotrophic sulfide oxidizers as a response to anoxic holomictic conditions in a seasonally stratified seawater lake.

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