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Microorganisms evolve rapidly due to their large population sizes and short generation times, often exhibiting measurable changes within days under laboratory conditions. Natural selection acts on standing genetic variation, enabling the retention and amplification of beneficial traits that confer fitness advantages in changing environments.Adaptive Pigment Regulation in RhodobacterIn Rhodobacter, a genus of purple non-sulfur bacteria, light-harvesting pigments such as bacteriochlorophyll and...
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Evolutionary bi-stability in pathogen transmission mode.

F van den Bosch1, B A Fraaije, F van den Berg

  • 1Rothamsted Research, Harpenden AL5 2JQ, UK. frank.vandenbosch@bbsrc.ac.uk

Proceedings. Biological Sciences
|February 5, 2010
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Summary
This summary is machine-generated.

Pathogens face a trade-off between infecting new hosts (horizontal transmission) and infecting offspring (vertical transmission). This can lead to evolutionary bi-stability, where pathogens switch transmission modes due to environmental changes.

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Area of Science:

  • Evolutionary biology
  • Pathogen dynamics
  • Disease ecology

Background:

  • Pathogens utilize horizontal and vertical transmission, requiring distinct adaptations.
  • These adaptations can create a trade-off between transmission modes.

Purpose of the Study:

  • To investigate the evolutionary consequences of trade-offs in pathogen transmission modes.
  • To explore the phenomenon of evolutionary bi-stability in pathogens.
  • To examine pathogen adaptation to environmental change through transmission mode shifts.

Main Methods:

  • Mathematical modeling to simulate evolutionary stable states.
  • Quantitative PCR to estimate pathogen abundance in wheat.
  • Analysis of pathogen transmission modes in relation to environmental changes.

Main Results:

  • Trade-offs in transmission can result in evolutionary bi-stability.
  • Gradual environmental changes can induce jumps between evolutionary stable states.
  • The wheat pathogen Phaeosphaeria nodorum has switched transmission modes twice in 160 years.

Conclusions:

  • Evolutionary bi-stability is a key factor in pathogen adaptation.
  • Environmental changes can drive significant shifts in pathogen transmission strategies.
  • Understanding these dynamics is crucial for disease control and predicting pathogen evolution.