6533b7dafe1ef96bd126ea6f
RESEARCH PRODUCT
Biocoenosis and induration of freshwaterRivulariastromatolites in a temperate climate
A. PascalA. DelcourtC. CaudwellJacques Langsubject
CyanobacteriaAchromobacterfood.ingredientMicroorganismRivulariaBiologybiology.organism_classificationMicrobiologyDesmococcusfoodStromatoliteBotanyEarth and Planetary Sciences (miscellaneous)Environmental ChemistryGreen algaeBiocoenosisGeneral Environmental Sciencedescription
Freshwater Rivularia haematites (D.C.) Agardh and Rivularia biasolettiana Menegh‐ini stromatolites were collected from the Plateau de Langres and Lac d'Annecy (France) and investigated experimentally. In addition to cyanobacteria, the community of organisms consists of Desmococcus (green algae) and many bacteria including Agrobacterium tumefaciens and Pseudomonas diminuta for Rivularia haematites, and Achromobacter group B and Pseudomonas acidovorans for Rivularia biasolettiana. Stromatolite induration is not confined to calcification and may locally exhibit apatite or gypsum crystals, with the latter appearing only in cultures exposed to light. The effect of certain microorganisms of the biocoenosis on induration is considered. Desmococcus inhibits the formation of sparite or microsparile in contact with Rivu‐laria filaments by making them longer and thinner. Photosynthesis by Rivularia probably produces the sugars required for the development of Achromobacter group B and Agrobacterium tumefaciens. These...
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1997-10-01 | Geomicrobiology Journal |