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Endolithic microbial ecosystems: Mol...

Walker, Jeffrey James.

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Endolithic microbial ecosystems: Molecular phylogenetic composition, ecology and geobiology.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Endolithic microbial ecosystems: Molecular phylogenetic composition, ecology and geobiology./
Author:	Walker, Jeffrey James.
Description:	174 p.
Notes:	Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0733.
Contained By:	Dissertation Abstracts International66-02B.
Subject:	Biology, Molecular. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3165820
ISBN:	9780542009211

Endolithic microbial ecosystems: Molecular phylogenetic composition, ecology and geobiology.
Walker, Jeffrey James.

Endolithic microbial ecosystems: Molecular phylogenetic composition, ecology and geobiology. - 174 p.

Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0733.

Thesis (Ph.D.)--University of Colorado at Boulder, 2005.

The endolithic environment, the pore space in rocks, is a ubiquitous microbial habitat. Photosynthesis-based endolithic communities inhabit the outer millimeters to centimeters of rocks exposed to the surface. In extremely desiccated environments, such as deserts, endolithic communities are most of the extant life. Among the simplest microbial ecosystems known, endolithic communities provide a tractable model to test ecological principles, which remain untested in microbial ecology due to experimental limitations and the extraordinary diversity of microorganisms. Previous studies have suggested specific hypotheses for endolithic communities, but these have been difficult to demonstrate with traditional microbiological techniques. Consequently, this study determined the composition of select endolithic communities with cultivation-independent, ribosomal RNA-based molecular phylogenetic methods. These methods provide incisive identification of microbial constituents and specific, DNA sequence information, which can be compared universally to test hypotheses about life's ecology and evolution.

ISBN: 9780542009211Subjects--Topical Terms:

1017719
Biology, Molecular.

Endolithic microbial ecosystems: Molecular phylogenetic composition, ecology and geobiology.
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100 1 $a Walker, Jeffrey James. $3 1912977
245 1 0 $a Endolithic microbial ecosystems: Molecular phylogenetic composition, ecology and geobiology.
300 $a 174 p.
500 $a Source: Dissertation Abstracts International, Volume: 66-02, Section: B, page: 0733.
500 $a Director: Norman R. Pace.
502 $a Thesis (Ph.D.)--University of Colorado at Boulder, 2005.
520 $a The endolithic environment, the pore space in rocks, is a ubiquitous microbial habitat. Photosynthesis-based endolithic communities inhabit the outer millimeters to centimeters of rocks exposed to the surface. In extremely desiccated environments, such as deserts, endolithic communities are most of the extant life. Among the simplest microbial ecosystems known, endolithic communities provide a tractable model to test ecological principles, which remain untested in microbial ecology due to experimental limitations and the extraordinary diversity of microorganisms. Previous studies have suggested specific hypotheses for endolithic communities, but these have been difficult to demonstrate with traditional microbiological techniques. Consequently, this study determined the composition of select endolithic communities with cultivation-independent, ribosomal RNA-based molecular phylogenetic methods. These methods provide incisive identification of microbial constituents and specific, DNA sequence information, which can be compared universally to test hypotheses about life's ecology and evolution.
520 $a Endolithic ecosystems were studied from three distinct areas: the Rocky Mountain region and Yellowstone National Park of the USA, and Shark Bay in Western Australia. Morphologically similar to endolithic communities from previous studies, Rocky Mountain communities provide insight into endolithic ecology. Novel endolithic communities were discovered in Yellowstone geothermal environments. Electron microscopic analysis indicated Yellowstone communities are subject to mineralization and fossilization. Remnants of such fossils might provide clues about ancient life analogous to those provided by fossil stromatolites, structures preserved throughout much of the &sim;4 billion year geological record and considered analogs of a few extant examples. Stromatolites have been popularly considered geological evidence for oxygenic photosynthesis. Here I present the first comprehensive analysis of living Shark Bay stromatolite communities. Results suggest microorganisms other than cyanobacteria dominate these communities and probably contribute to their formation. Therefore, fossil stromatolites cannot be taken alone as evidence for oxygenic photosynthesis. Phylogenetic and statistical comparison of endolithic communities from this study and a previous study of Antarctic communities help support the principle that patterns of microbial diversity are governed by similar principles observed in macro-ecological systems. Results also provide insight into geobiological processes that shape the biosphere and help us understand the history of life on Earth and possibly elsewhere in the Solar System.
590 $a School code: 0051.
650 4 $a Biology, Molecular. $3 1017719
650 4 $a Biology, Microbiology. $3 1017734
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710 2 0 $a University of Colorado at Boulder. $3 1019435
773 0 $t Dissertation Abstracts International $g 66-02B.
790 1 0 $a Pace, Norman R., $e advisor
790 $a 0051
791 $a Ph.D.
792 $a 2005
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3165820