Dissertation/Thesis Abstract

Tightly-coupled sulfur-cycling microbial mats of the White Point hydrothermal vent field, CA: An analog for deep-sea vents
by Miranda, Priscilla J., M.S., California State University, Long Beach, 2015, 79; 1592649
Abstract (Summary)

For over 3.5Ga microbial activities have profoundly altered planetary geochemistry. In particular, sulfur-cycling hydrothermal vent communities have been important players in shaping biogeochemistry and the habitability of Earth. However, the remote nature of deep-sea vents makes investigations challenging. Using the White Point (WP) shallow-sea hydrothermal vent field as a proxy, I employed molecular sequencing, fluorescent in situ hybridization (FISH) and 35S-radiotracer assays to investigate the diversity and function of chemoautotrophic microbial mats. This study revealed a highly active and diverse sulfur-cycling microbial community. Potential epibiotic associations between sulfur-oxidizing (SOxB) and sulfate/sulfur-reducing bacteria (SRB) were identified using FISH. Comparative analyses of 16S rRNA sequences revealed the WP sulfur vent microbial mat community to be similar to deep-sea microbial communities from hydrothermal vents in a range of biotopes and lithologic settings and supported the relevancy of the WP hydrothermal sulfur-vent microbial mats as an excellent model for studying "thiobiotic" vent communities.

Indexing (document details)
Advisor: Stevens, Lora R.
Commitee: Dillon, Jesse G., Whitcraft, Christine R.
School: California State University, Long Beach
Department: Geological Sciences
School Location: United States -- California
Source: MAI 54/06M(E), Masters Abstracts International
Subjects: Microbiology, Biogeochemistry, Geobiology
Keywords: Fish, Hydrothermal vents, Microbial mats, Sulfur-cycling, Sulfur-reducing bacteria, White point
Publication Number: 1592649
ISBN: 978-1-321-88143-1
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