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Biology of Microbial Communities - Interview
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Decomposition responses to climate depend on microbial community composition.

Sydney I Glassman1,2, Claudia Weihe3, Junhui Li4

  • 1Department of Ecology and Evolutionary Biology, University of California, Irvine, CA 92697; sydney.glassman@ucr.edu.

Proceedings of the National Academy of Sciences of the United States of America
|November 7, 2018
PubMed
Summary
This summary is machine-generated.

Microbial communities significantly impact decomposition and litter chemistry, with bacterial roles potentially underestimated compared to fungi. Climate change effects on decomposition are complex, influenced by microbial community composition.

Keywords:
bacteriaelevation gradientfungileaf litter decompositionreciprocal transplant

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Area of Science:

  • Ecology
  • Microbiology
  • Environmental Science
  • Carbon Cycle Research

Background:

  • Decomposition by bacteria and fungi is crucial for the carbon cycle.
  • The influence of microbial community composition on decomposition rates and outcomes is not fully understood.
  • Traditional views emphasize fungi as primary decomposers, with bacteria playing a secondary role.

Purpose of the Study:

  • To investigate the distinct roles of microbial communities versus environmental factors in driving decomposition.
  • To determine if the decomposition response to climate change is contingent on the specific microbial community present.
  • To reevaluate the functional redundancy and relative importance of bacterial and fungal communities in decomposition.

Main Methods:

  • An 18-month reciprocal transplant experiment was conducted along a climate gradient.
  • Microbial decomposers from different sites were transplanted onto common leaf litter within "microbial cages" to isolate microbial effects.
  • Bacterial and fungal composition, abundance, litter mass loss, and litter chemistry were analyzed over time.

Main Results:

  • Microbial communities significantly altered decomposition rates and litter chemistry after 12 months.
  • Functional decomposition measurements showed an interaction between microbial community and climate, defying prior theoretical predictions.
  • Climate change and transplantation exhibited differential legacy effects on bacterial and fungal communities.
  • Bacterial communities appeared less functionally redundant than fungal communities in decomposition processes.

Conclusions:

  • Microbial community composition plays a critical role in decomposition and its response to climate change.
  • Bacterial communities may possess unique functional roles in decomposition that are not fully redundant with those of fungi.
  • The findings necessitate a reevaluation of both the impact of microbial community composition on decomposition under climate change and the specific roles of bacteria and fungi.