geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Mysterious microbes in mounds; cyanobacterial communities and texture in modern Bahamian stromatolites


, : Mysterious microbes in mounds; cyanobacterial communities and texture in modern Bahamian stromatolites. Abstracts with Programs - Geological Society of America 34(2): 87

Stromatolites were the dominant community in the fossil record for most of Earth history, and are thus our keys to understanding the interactions between life and the environment on early Earth. The inherent difficulty in making this connection is the lack of information regarding the complex microbial community that once existed within the living stromatolite. The discovery of modern structures resembling stromatolites has provided the opportunity to investigate the relationship between the modern microbial community, the environment, and the potentially preservable morphology and original texture of the stromatolite mound. With this understood, we will be closer to resolving whether modern stromatolites are analogs for ancient ones, as well as better understanding stromatolites as paleoenvironmental indicators. Through a combination of field observations and lab experiments, this project begins to address the relationship between the microbial communities and textures within stromatolites off of Lee Stocking Island, Bahamas. Surficial soft cores and internal rock cores were collected from stromatolites in the tidal channel between Exuma Sound and the shallow Great Bahama Bank. Location of cores relative to water flow was noted, so correlation between flow and either texture or microbial community could be made. Textures of the soft cores were described as to cohesiveness, color, cement, sand grain condition, and density and apparent health of bacterial sheaths, providing a look at initial lithification. Textures of the hard rock cores are described within the geologic framework used to examine fossil stromatolites to elucidate the history of these mounds as stromatolites, thrombolites, or otherwise. Cyanobacteria, the primary producers of the mounds' ecosystem, were subsampled from the soft surficial cores and are being isolated and identified in culture. Cultures are used in lab simulations in which salinity, light, and depth of burial are varied to determine differing optimal growing conditions and motility capabilities of the various types of cyanobacteria. This will provide information regarding the vertical stratification of the cyanobacteria, which may have consequences for laminated textures, and will help constrain the preferred environmental conditions for these mounds.

US$29.90


Other references

Schneider, J.H.; Manncke, K.; Grund, K.E.; Becker, H.D., 1999: Differential achalasia therapy. The early relief of esophageal outflow obstruction in patient with achalasia diminishes complaints and avoids deterioration as a result of this disease. The pneumatic myotomy of the lower esophageal sphincter is the initial therapeutic concept. Af...

Jakubowski, J.; Bijok, F., 1956: Standardising cheese-milk fat content and determining cheese yield in relation to the chemical composition of milk. The Polish standards for cheese require them to contain 40% or 20% fat in the dry matter. In order to determine the yield of, and amount of fat in, a cheese, 12 formulae connecting the fat and S.N.F. content of cheese milk with the yield and fat c...

Popov V.A., 1988: The necessity of intensifying mineralogical investigations in mineral resource technology. Pages 16-21 1988

Lu, X.; Zhang, S., 1999: The dosage of hyperbaric oxygen therapy in patients with sudden hearing loss. Free radical metabolism substances in different stages of hyperbaric oxygen (HBO) therapy in 33 patients with sudden hearing loss were studied. The time of treatment is 40 min each day and the pressure of HBO is 0.2 MPa, with treatment lasting for...

Zubkov V.S.; Kuznetsova A.I.; Odareyeva L.N.; Petrov L.L.; Smirnova Y.V.; Frolova L.P.; Yaroshenko S.K., 1988: Rare elements in lherzolite xenoliths and basanites from Chulym-Yenisey Depression explosion pipes. Geochemistry International 25(8): 97-104

Laufer, L.A., 1983: Demand for child health and fertility in rural India. The determinants of child health, mortality, and fertility are analyzed within a household production framework which incorporates the child's genetic health endowment with relevant prices. Child height-for-age and weight-for-height are the p...

Larson, I.A.; Hoffman, A.; Artman, M., 2017: Maximizing Health Outcomes in a Medical Home for Children with Medical Complexity: The Beacon Program. Journal of Pediatrics 183: 4-5

Etti, S.; Hails, R.; Schäfer, S.M.; D.M.chelis, S.; Sewell, H-Sisko.; Bormane, A.; Donaghy, M.; Kurtenbach, K., 2003: Habitat-specific diversity of Borrelia burgdorferi sensu lato in Europe, exemplified by data from Latvia. The distribution of Borrelia burgdorferi sensu lato genospecies in questing Ixodes ricinus ticks from ecologically distinct habitats in Latvia was analyzed. A significant variation in the frequency of the genospecies across sites was observed, poi...

Gessi, M.; Moneim, Y.Abdel.; Hammes, J.; Goschzik, T.; Scholz, M.; Denkhaus, D.; Waha, A.; Pietsch, T., 2014: FGFR1 mutations in Rosette-forming glioneuronal tumors of the fourth ventricle. Rosette-forming glioneuronal tumors (RGNTs) are rare glioneuronal tumors of the fourth ventricle region that preferentially affect young adults. Despite their histologic similarity with pilocytic astrocytomas (PAs), RGNTs do not harbor KIAA1549-BR...

Sibai, A.-Nour; Muallem, M.; Zein, J., 1999: Double T-piece, an injector, and Bird(R) Ventilator use in MRI suite. The double T-piece breathing system is described. The Bird(R) Ventilator Mark 2 is utilised as an oxygen pressure jet to drive an injector placed at the distal end of the double T-piece breathing system. An active anti-pollution assembly is employ...