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Rapid evolution and ecological host-parasite dynamics.

Meghan A Duffy1, Lena Sivars-Becker

  • 1W.K. Kellogg Biological Station, Michigan State University, 3700 E. Gull Lake Drive, Hickory Corners, MI 49060, USA. mduffy2@wisc.edu

Ecology Letters
|January 6, 2007
PubMed
Summary
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Rapid host evolution, not just ecological factors, can end parasite epidemics. Studies on Daphnia dentifera and its parasite Metschnikowia bicuspidata show increased host resistance drives epidemic termination.

Area of Science:

  • Ecology
  • Evolutionary Biology
  • Epidemiology

Background:

  • Parasite epidemics traditionally end due to host mortality or immunity.
  • The role of rapid host evolution in epidemic termination remains under-explored.

Purpose of the Study:

  • To investigate the role of rapid host evolution in the termination of parasite epidemics.
  • To examine host-parasite dynamics in the Daphnia dentifera - Metschnikowia bicuspidata system.

Main Methods:

  • Assessed host resistance and susceptibility variance in Daphnia populations from lakes with and without recent epidemics.
  • Evaluated genetic variation in parasite infectivity and virulence.
  • Utilized an epidemiological model incorporating host genetic variation.

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Main Results:

  • Daphnia from lakes with recent epidemics exhibited higher resistance and lower susceptibility variance.
  • Limited genetic variation was found in Metschnikowia infectivity or virulence.
  • Epidemiological modeling indicated rapid host evolution explains epidemic termination timelines.

Conclusions:

  • Parasite-mediated selection can drive rapid host evolution in natural populations.
  • Rapid host evolution significantly impacts short-term host-parasite dynamics and epidemic termination.