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Coevolutionary diversification creates nested-modular structure in phage-bacteria interaction networks.

Stephen J Beckett1, Hywel T P Williams1

  • 1Biosciences, College of Life and Environmental Sciences , University of Exeter , Exeter EX4 4PS , UK.

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|February 12, 2014
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Summary
This summary is machine-generated.

Marine phage-bacteria interactions form complex networks. A simple coevolution model explains these nested-modular structures, revealing simple origins for complex ocean ecosystems.

Keywords:
coevolutionmodularitynestednessphagephage–bacteria infection networksrelaxed lock-and-key

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Area of Science:

  • Marine microbiology
  • Ecology
  • Evolutionary biology

Background:

  • Phage and bacteria are the most abundant life forms in oceans, critically influencing marine ecology.
  • Their interaction networks provide insights into coevolutionary processes and community structure.
  • Observed networks exhibit nested structures at small phylogenetic scales and nested-modular structures at larger scales.

Purpose of the Study:

  • To investigate the coevolutionary origins of marine phage-bacteria interaction networks.
  • To determine if a simple coevolution model can reproduce observed nested-modular network structures.
  • To understand the ecological dynamics driving these communities.

Main Methods:

  • Development of a simple host-phage coevolution model based on genetic matching.
  • Simulation of host-phage interactions and community assembly.
  • Analysis of resulting bipartite interaction networks for nested-modular structure.
  • Consideration of ecological dynamics like negative frequency-dependent selection and kill-the-winner dynamics.

Main Results:

  • The coevolution model successfully generated nested-modular interaction networks, mirroring natural marine communities.
  • Negative frequency-dependent selection drives diversification in both hosts and phages.
  • Kill-the-winner dynamics maintain community diversity.
  • Network structure significance depends on the inclusion of interaction strain densities.

Conclusions:

  • Complex marine phage-bacteria community structures can emerge from simple coevolutionary processes.
  • Genetic matching and frequency-dependent selection are key drivers of network architecture.
  • The findings offer a parsimonious explanation for the organization of microbial ecosystems in the ocean.