자료유형  

 학위논문

Control Number  

0017162082

International Standard Book Number  

9798384463283

Dewey Decimal Classification Number  

550

Main Entry-Personal Name  

Garvin, Zachary Kellen.

Publication, Distribution, etc. (Imprint  

[S.l.] : Princeton University., 2024

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2024

Physical Description  

253 p.

General Note  

Source: Dissertations Abstracts International, Volume: 86-04, Section: B.

General Note  

Advisor: Onstott, Tullis C.;Ward, Bess B.

Dissertation Note  

Thesis (Ph.D.)--Princeton University, 2024.

Summary, Etc.  

요약Hot springs on Earth host diverse microorganisms supported by the high energy environments and the substrates they supply. They provide a surface environment for probing the effects of subsurface processes on microbial communities as the hydrothermal fluids rise and interact with surface geology, hydrology, and atmosphere. The influence of hot springs on these communities has been widely demonstrated, tightly linking variable spring geochemistry among hot spring fluids to the selection of different taxa and metabolisms. Given the potency of these controlling effects and the breadth of subsurface processes in geothermal regions, surrounding soil environments and associated microbial communities could also be subjected to the influences of nearby hot springs.In this dissertation, soil microbial communities were assessed for their relationship with hot springs based on spatial proximity. At Polloquere hot spring, located in the Salar de Surire of the Andean Altiplano, I showed that rates of high-affinity oxidation of trace gases (H2, CO) and associated genes increased as a function of radial distance from the hot spring into the more arid desert soils. The measured substrate affinities represent the highest reported affinity values for H2 to-date. A similar study was performed in Yellowstone National Park on two colocalized hot springs fed by phase-separated fluids. Patterns of high-affinity H2 oxidation resembled those observed at Polloquere with increased net oxidation rates and high-affinity hydrogenases at increased distance from the vapor-influenced acid-sulfate "Red Bubbler" spring. However, the H2 activity was completely absent from soils adjacent to the neutral-chloride Perpetual Spouter hot spring, suggesting that decreased dissolved gas in the fluid and hypothesized silica sinter armor limit H2 delivery to these soils. Returning to Polloquere as a Mars analog, lipid analyses revealed that the techniques employed on current Mars robotic missions effectively capture shifts in lipid distributions indicative of community changes despite discrepancies in specific lipid abundances and the inability to examine more complex molecules as compared to typical terrestrial methods. Together, these results establish a paradigm for understanding the spatial reach of hot spring influence on soil microbial communities particularly through gas delivery with implications for life detection in hydrothermal systems on Mars.

Subject Added Entry-Topical Term  

Geobiology.

Subject Added Entry-Topical Term  

Microbiology.

Subject Added Entry-Topical Term  

Ecology.

Index Term-Uncontrolled  

Astrobiology

Index Term-Uncontrolled  

Biosignatures

Index Term-Uncontrolled  

Geomicrobiology

Index Term-Uncontrolled  

Metagenomics

Index Term-Uncontrolled  

Microbial ecology

Index Term-Uncontrolled  

Trace gas

Added Entry-Corporate Name  

Princeton University Geosciences

Host Item Entry  

Dissertations Abstracts International. 86-04B.

Electronic Location and Access  

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Control Number  

joongbu:653849