Geobio interactions in hydrothermal fluids from the Mid-Atlantic Ridge the role of organic ligands

  • This dissertation deals with the interaction between biological and hydrothermal processes in deep-sea hydrothermal environments, focusing on the topic of metal-organic complexation in hydrothermal fluids. Amino acids (AAs) could serve as ligands for metal complexation. In my first project, I found that most of the hydrothermal fluid samples contain significant amounts of AAs. This suggests that AAs are stable in solution under hydrothermal conditions. The presence of elevated AA concentrations in hydrothermal fluids implies that they are available as a nutrient source to vent organisms and as potential complexing agents for metals, possibly influencing their bioavailability and solubility. The second project was carried out to study the role of metal-organic complexation in detoxifying the hydrothermal vent environment characterised by high levels of heavy metals. Hydrothermal vent microbes were cultured to investigate the influence of increasing Cu concentrations on microorganisms and organic Cu-ligand formation. The result suggests that the cultured microbes can adapt to the supplemented range of Cu concentrations. The results of Cu-ligand analyses support the hypothesis that the microbes produce more Cu-binding ligands with increasing Cu stress, thus increasing Cu solubility and avoiding Cu uptake. These results point to a microbial influence on dissolved metal concentrations, speciation and mineral precipitation in the hydrothermal vent environment. The third project was carried out to study black smoker particulates precipitating from hot hydrothermal fluids upon mixing with seawater as an important feature of the hydrothermal habitat, influencing hydrothermal animals. Results indicate the dominance of sulphide minerals in all samples. However, pronounced differences were detected in the mineralogy of the particles between Logatchev and 5 S that could be attributed to differences in fluid chemistry.

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Publishing Institution:IRC-Library, Information Resource Center der Jacobs University Bremen
Granting Institution:Jacobs Univ.
Author:Verena Klevenz
Referee:Andrea Koschinsky, Michael Bau, Wolfgang Bach, Mirjam Perner
Advisor:Andrea Koschinsky
Persistent Identifier (URN):urn:nbn:de:101:1-201305157711
Document Type:PhD Thesis
Date of Successful Oral Defense:2010/12/20
Date of First Publication:2010/01/27
PhD Degree:Geosciences
School:SES School of Engineering and Science
Library of Congress Classification:Q Science / QR Microbiology / QR100-131 Microbial ecology / QR103 Geomicrobiology. Microbial effect on geological processes
Call No:Thesis 2010/37

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