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Microbial Astronauts: Assembling Microbial Communities for Advanced Life Support Systems

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Abstract

Extension of human habitation into space requires that humans carry with them many of the microorganisms with which they coexist on Earth. The ubiquity of microorganisms in close association with all living things and biogeochemical processes on Earth predicates that they must also play a critical role in maintaining the viability of human life in space. Even though bacterial populations exist as locally adapted ecotypes, the abundance of individuals in microbial species is so large that dispersal is unlikely to be limited by geographical barriers on Earth (i.e., for most environments “everything is everywhere” given enough time). This will not be true for microbial communities in space where local species richness will be relatively low because of sterilization protocols prior to launch and physical barriers between Earth and spacecraft after launch. Although community diversity will be sufficient to sustain ecosystem function at the onset, richness and evenness may decline over time such that biological systems either lose functional potential (e.g., bioreactors may fail to reduce BOD or nitrogen load) or become susceptible to invasion by human-associated microorganisms (pathogens) over time. Research at the John F. Kennedy Space Center has evaluated fundamental properties of microbial diversity and community assembly in prototype bioregenerative systems for NASA Advanced Life Support. Successional trends related to increased niche specialization, including an apparent increase in the proportion of nonculturable types of organisms, have been consistently observed. In addition, the stability of the microbial communities, as defined by their resistance to invasion by human-associated microorganisms, has been correlated to their diversity. Overall, these results reflect the significant challenges ahead for the assembly of stable, functional communities using gnotobiotic approaches, and the need to better define the basic biological principles that define ecosystem processes in the space environment.

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Authors and Affiliations

  1. Dynamac Inc., DYN-3, John F. Kennedy Space Center, FL, 32899, USA

    M. S. Roberts��& J. L. Garland

  2. Office of Biological Research, John F. Kennedy Space Center, FL, 32899, USA

    A. L. Mills

  3. Laboratory of Microbial Ecology, University of Virginia, Box 400123, Charlottesville, VA, 22904-4123, USA

    A. L. Mills

Authors
  1. M. S. Roberts
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  2. J. L. Garland
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  3. A. L. Mills
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Correspondence to M. S. Roberts.

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Roberts, M.S., Garland, J.L. & Mills, A.L. Microbial Astronauts: Assembling Microbial Communities for Advanced Life Support Systems. Microb Ecol 47, 137–149 (2004). https://doi.org/10.1007/s00248-003-1060-5

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  • DOI: https://doi.org/10.1007/s00248-003-1060-5

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