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Contrasting Community Assembly Forces Drive Microbial Structural and Potential Functional Responses to Precipitation

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Microbial communities in new soils are shaped by deterministic forces for structure and stochastic forces for function. Precipitation influences these microbial dynamics, impacting landscape evolution.

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Area of Science:

  • Microbial Ecology
  • Soil Science
  • Ecological Succession

Background:

  • Microbial communities are key drivers of early soil development and landscape evolution.
  • Understanding the ecological forces governing microbial community assembly in nascent soils is crucial but limited.
  • Incipient soil systems provide a unique model for studying fundamental ecological processes.

Purpose of the Study:

  • To investigate microbial taxonomic and functional assembly in response to precipitation in incipient basaltic soil.
  • To differentiate the roles of deterministic and stochastic processes in structuring microbial communities and their functions.
  • To assess how environmental fluctuations, like precipitation, influence microbial dynamics in early soil formation.

Main Methods:

  • Amplicon sequencing was employed to analyze microbial taxonomic community assembly.
  • Metagenome sequencing was utilized to evaluate microbial functional potential assembly.
  • Comparative analysis of soil samples before and after precipitation, stratified by depth.

Main Results:

  • Microbial community composition varied with soil depth, with surface communities remaining distinct post-precipitation.
  • Deeper soil microbial communities showed increased uniformity after precipitation.
  • Community structure assembly was deterministic (homogenous selection), while carbon and nitrogen functional potential assembly was stochastic.
  • Nitrogen cycle and carbon fixation sub-populations experienced opposing pressures at depth, indicating adaptive functional dynamics.

Conclusions:

  • Contrasting assembly forces shape microbial structure and function in incipient landscapes.
  • In situ landscape characteristics (parent material) drive deterministic community structure.
  • Short-term environmental fluctuations (precipitation) induce stochastic functional dynamics in microbial sub-populations.
  • These dynamics suggest microbial communities can adapt functionally to environmental changes, influencing landscape-scale responses.