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High parasite diversity accelerates host adaptation and diversification.

A Betts1, C Gray2, M Zelek3

  • 1Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK. alex.betts@evobio.eu kayla.king@zoo.ox.ac.uk.

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Summary
This summary is machine-generated.

Diverse parasite communities accelerate host evolution, shifting coevolution dynamics from fluctuating to arms race. This enhances host resistance and reduces parasite infectivity, impacting molecular evolution rates.

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Area of Science:

  • Evolutionary Biology
  • Microbial Ecology
  • Host-Parasite Interactions

Background:

  • Host-parasite coevolution is a well-established phenomenon.
  • The impact of multiple parasites on host coevolutionary dynamics remains largely unexplored.
  • Understanding these complex interactions is crucial for predicting evolutionary trajectories.

Purpose of the Study:

  • To investigate how diverse parasite communities influence host evolution.
  • To determine the effect of parasite diversity on coevolutionary dynamics.
  • To elucidate the mechanisms driving host resistance and parasite infectivity changes.

Main Methods:

  • Experimental coevolution using a host bacterium and its viral parasites (bacteriophages).
  • Analysis of shifts in selection modes (fluctuating vs. directional dynamics).
  • Identification of genetic mutations, specifically in lipopolysaccharide genes, conferring resistance.

Main Results:

  • Increased parasite diversity accelerated host evolution and enhanced host resistance.
  • Parasite diversity led to decreased parasite infectivity.
  • Coevolutionary dynamics shifted from Red Queen (fluctuating) to arms race (directional) selection.
  • Arms race dynamics involved selective sweeps of generalist resistance mutations in lipopolysaccharide genes.
  • Faster molecular evolution within host populations and greater genetic divergence among populations were observed.

Conclusions:

  • Exposure to diverse parasite communities significantly influences the rate and type of host-parasite coevolution.
  • Parasite diversity can drive rapid host adaptation and genetic divergence.
  • The findings highlight the importance of considering community-level interactions in evolutionary studies.