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This summary is machine-generated.

The mammalian microbiome influences behavior, but symbiont manipulation is unlikely. Behavioral effects likely arise as byproducts of microbial and host natural selection, emphasizing microbial ecology.

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Area of Science:

  • Microbial Ecology
  • Neuroscience
  • Evolutionary Biology

Background:

  • The mammalian microbiome influences host behavior, with some microbes producing neurotransmitters.
  • A common hypothesis suggests microbes manipulate host behavior for their own benefit.

Purpose of the Study:

  • To evaluate the microbial manipulation hypothesis of the gut-brain axis using evolutionary theory.
  • To explore alternative explanations for microbiome-induced behavioral effects.

Main Methods:

  • Application of evolutionary theory to existing research on the gut-brain axis.
  • Analysis of conditions under which microbial manipulation is evolutionarily stable.
  • Examination of empirical data for evidence of manipulation versus byproduct effects.

Main Results:

  • Evolutionary theory suggests microbial manipulation is unlikely in diverse mammalian microbiomes due to competitive exclusion by non-manipulating strains.
  • Current data do not provide clear evidence supporting the manipulation hypothesis.
  • Behavioral effects are more plausibly explained as byproducts of natural selection on microbes for growth and on hosts for symbiont dependence.

Conclusions:

  • The manipulation hypothesis is not well-supported by evolutionary theory or current data for the mammalian gut-brain axis.
  • Microbiome-influenced behaviors likely result from microbial and host co-evolutionary processes, not deliberate manipulation.
  • Future research should focus on microbial ecology and local host-microbe interactions to understand these behavioral effects.