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  Microbial communities in high altitude altiplanic wetlands in northern Chile: phylogeny, diversity and function

Dorador Ortiz, C. I. (2007). Microbial communities in high altitude altiplanic wetlands in northern Chile: phylogeny, diversity and function. PhD Thesis, Christian-Albrechts-Universität, Kiel.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-D770-C Version Permalink: https://hdl.handle.net/11858/00-001M-0000-000F-D771-A
Genre: Thesis

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Dorador Ortiz, Cristina Inés1, Author           
Imhoff, Johannes F., Advisor
Vila, Irma, Referee
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              

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 Abstract: The phylogeny, diversity and function of microbial communities from several altiplanic wetlands was examined using an array of different but complimentary techniques. Results highlighted that microbial diversity exhibited a specific pattern in each wetland. Bacteria were dominant over Archaea in both freshwater and saline systems. Bacterial and archaeal diversity were both higher in sediment than in water samples. Lago Chungará, Laguna de Piacota and Bofedal de Parinacota are freshwater wetlands located at high altitude (>4400 m) in the north of Chile. They support microbial communities closely related to psychrophilic bacteria (e.g. Psychrobacter sp., Pseudomonas congelans, Flavobacterium psychrolimnae) in water and Proteobacteria and Actinobacteria in sediment samples. Salar de Huasco and Salar de Ascotán are located further south at an altitude of 3800 m and exhibit a wide range of salinities (varying between freshwater to 120 gL-1 of total dissolved salts). Microbial communities in these sites were characterized by bacteria tolerant to salt (e.g. halophilic Bacteria: Halomonas sp., halophilic Archaea: Halorubrum sp.). Cytophaga-Flavobacteria-Bacteroidetes was the most frequent group reported at the sites. In-depth studies focussing on the Salar de Huasco revealed a particular diversity of Archaea, characterized by a number of sequences related to uncultured groups and ammonia-oxidizing Crenarchaeota. Cyanobacteria from the Salar de Huasco were closely related to Cyanobacteria previously described from Antarctica. Isolates of halophilic bacteria and phototrophic bacteria displayed an elevated tolerance to different salt concentrations. The particular microbial diversity found in high altitude wetlands provides a new and exciting area of research.

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Language(s): eng - English
 Dates: 2007-07-06
 Publication Status: Accepted / In Press
 Pages: 170 S.
 Publishing info: Kiel : Christian-Albrechts-Universität
 Table of Contents: TABLE OF CONTENTS
Summary ……………………………………………………………………………….1
Zusammenfassung ……………………………………………………………………...2
Resumen ………………………………………………………………………………..3
Thesis outline …………………………………………………………………………..5
1. Introduction ………………………………………………………………………….6
2. Materials and Methods ……………………………………………………………..22
3. Comparative analysis of bacterial and archaeal communities in different high altitude wetlands in Northern Chile ……………………………………………………………35
4. Diversity of Archaea in environmental samples from Salar de Huasco ……………58
5. Diversity and composition of photosynthetic bacterial communities in Salar de Huasco …………………………………………………………………………………74
6. Salt tolerance of enrichment cultures of ammonia oxidizing bacteria from Salar de Huasco ………………………………………………………………………………..102
7. Molecular analysis of halophilic bacteria isolates from Salar de Huasco …………115
8. Discussion …………………………………………………………………………124
Conclusion ……………………………………………………………………………133
Individual scientific contributions to multiple-author publications ………………….134
References ……………………………………………………………………………136
Acknowledgements …………………………………………………………………..163
Curriculum Vitae ……………………………………………………………………..165
Erklärung ……………………………………………………………………………..166
Appendix ……………………………………………………………………………..167
 Rev. Type: -
 Identifiers: eDoc: 319201
Other: Diss/11476
 Degree: PhD

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