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The "song, not the singer" theory suggests microbial functions, not species, are inherited across generations. This study supports that microbial community functions stabilize over time, influenced by host-microbiota interactions and migration.

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Area of Science:

  • Microbiology
  • Ecology
  • Evolutionary Biology

Background:

  • Holobionts comprise a host and its associated microbiota.
  • Vertical transmission of microbiota is limited, impacting co-evolution.
  • The "song, not the singer" theory posits functional trait conservation over taxonomic composition.

Purpose of the Study:

  • To test the conservation of functional microbiota composition across generations.
  • To investigate changes in functional microbiota composition within a generation.
  • To simulate microbiota communities to understand the role of interactions in stability.

Main Methods:

  • Analysis of zooplankton, mosquito, and plant datasets for cross-generational functional conservation.
  • Examination of human datasets for temporal changes in functional microbiota composition.
  • Computer simulations of microbial communities to assess interaction-driven stability.

Main Results:

  • Vertically transmitted microbiota initiate a predictable functional succession over time.
  • Community robustness is influenced by the influx of diverse microbial migrants.
  • Microbiota succession leads to a stable functional composition, shaped by host-microbiota and higher-order interactions.

Conclusions:

  • Functional composition, rather than strict taxonomic identity, may be conserved across host generations.
  • Host-microbiota interactions play a crucial role in stabilizing microbial communities.
  • The findings support the concept of holobionts as units of selection with broad applicability, including animal breeding.