Book contents
- Frontmatter
- Contents
- List of contributors
- 1 Introduction
- 2 Geologic analogies between the surface of Mars and the McMurdo Dry Valleys: microclimate-related geomorphic features and evidence for climate change
- 3 The legacy of aqueous environments on soils of the McMurdo Dry Valleys: contexts for future exploration of martian soils
- 4 The antarctic cryptoendolithic microbial ecosystem
- 5 Antarctic McMurdo Dry Valley stream ecosystems as analog to fluvial systems on Mars
- 6 Saline lakes and ponds in the McMurdo Dry Valleys: ecological analogs to martian paleolake environments
- 7 The biogeochemistry and hydrology of McMurdo Dry Valley glaciers: is there life on martian ice now?
- 8 Factors promoting microbial diversity in the McMurdo Dry Valleys, Antarctica
- 9 Other analogs to Mars: high-altitude, subsurface, desert, and polar environments
- Index
- References
8 - Factors promoting microbial diversity in the McMurdo Dry Valleys, Antarctica
Published online by Cambridge University Press: 06 July 2010
- Frontmatter
- Contents
- List of contributors
- 1 Introduction
- 2 Geologic analogies between the surface of Mars and the McMurdo Dry Valleys: microclimate-related geomorphic features and evidence for climate change
- 3 The legacy of aqueous environments on soils of the McMurdo Dry Valleys: contexts for future exploration of martian soils
- 4 The antarctic cryptoendolithic microbial ecosystem
- 5 Antarctic McMurdo Dry Valley stream ecosystems as analog to fluvial systems on Mars
- 6 Saline lakes and ponds in the McMurdo Dry Valleys: ecological analogs to martian paleolake environments
- 7 The biogeochemistry and hydrology of McMurdo Dry Valley glaciers: is there life on martian ice now?
- 8 Factors promoting microbial diversity in the McMurdo Dry Valleys, Antarctica
- 9 Other analogs to Mars: high-altitude, subsurface, desert, and polar environments
- Index
- References
Summary
The McMurdo Dry Valleys (MDV) comprise a mosaic of habitats at scales ranging from micrometers to the kilometer scale. The varied landscape of the valleys, combined with strong physical and chemical gradients within and across the terrestrial and aquatic habitats, yields an ecosystem dominated by microbes that is both complex and diverse (Gordon et al.,2000; Smith et al., 2006; Mikucki and Priscu, 2007). The cold desert environment is analogous to icy conditions found on other icy worlds. For example, the low organic carbon, cold, arid soils of the MDV are similar to Mars' present-day terrestrial environment and the glaciers and ice-covered lakes of the MDV are comparable to conditions that existed on Mars in the past (Priscu et al., 1998; Wynn-Williams and Edwards, 2000; McKay et al., 2005). If there are extant or extinct life forms on Mars, they likely experience similar physical constraints and environmental challenges as do microbial communities in the MDV. Therefore, the MDV provide a unique earthly setting to gain insight into the diversity, adaptation, and function of life on other icy worlds. Here we describe the ecological processes and conditions that contribute to the microbial diversity observed in the MDV and relate these to potential life on Mars.
The McMurdo Dry Valley ecosystem
The MDV include a variety of unique habitats that are connected physically, chemically, and energetically (Fig. 8.1). Solar radiation and wind are the underlying forces that determine the existence and distribution of biota throughout the valleys (Dana et al., 1998; Nkem et al., 2006).
- Type
- Chapter
- Information
- Life in Antarctic Deserts and other Cold Dry EnvironmentsAstrobiological Analogs, pp. 221 - 257Publisher: Cambridge University PressPrint publication year: 2010
References
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