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Origin of biogeographically distinct ecotypes during laboratory evolution.

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Few gene mutations rapidly created specialized microbial ecotypes that spatially partitioned resources. This niche differentiation enhanced community stability and methane production in a simulated subsurface environment.

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Area of Science:

  • Microbial Ecology
  • Evolutionary Biology
  • Biogeochemistry

Background:

  • Microbial communities drive global biogeochemical cycles, such as methane emissions, through resource partitioning and syntrophic interactions.
  • Previous research demonstrated evolutionary diversification in planktonic sulfate reducers (Desulfovibrio vulgaris, Dv) and methanogens (Methanococcus maripaludis, Mm), enhancing community stability and productivity.
  • Understanding the genetic basis and rapid emergence of specialized microbial ecotypes is crucial for predicting ecosystem functions.

Purpose of the Study:

  • To investigate how a small number of genetic mutations can drive the formation of spatially distinct microbial ecotypes.
  • To determine if these ecotypes exhibit resource partitioning and enhanced community productivity within a simulated subsurface environment.
  • To elucidate the interplay between genetic changes, spatial segregation, and functional specialization in a syntrophic microbial community.

Main Methods:

  • Utilized a minimal assemblage of evolved Desulfovibrio vulgaris (Dv) and Methanococcus maripaludis (Mm).
  • Introduced specific mutations into Dv and Mm genomes.
  • Cultured the evolved community in a fluidized bed reactor to promote spatial enrichment and resource partitioning.
  • Analyzed resource utilization (lactate, H2) and methane production by different ecotypes.

Main Results:

  • Mutations in a small number of genes (15 in Dv, 7 in Mm) rapidly led to the emergence of co-existing, spatially enriched ecotypes within days.
  • Spatially segregated ecotypes demonstrated distinct resource partitioning: attached Dv utilized lactate, while associated Mm utilized some H2.
  • Unutilized H2 was scavenged by planktonic Mm with high-affinity hydrogenases, leading to significant methane production.
  • The interplay between niche-differentiated ecotypes synergistically boosted the overall productivity of the mutualistic community.

Conclusions:

  • A few genetic mutations are sufficient to drive rapid niche differentiation and spatial resource partitioning in microbial communities.
  • The emergence of specialized ecotypes enhances the stability and productivity of mutualistic microbial assemblages.
  • This study provides a model for understanding how micro-evolutionary processes shape microbial community structure and function in complex environments.