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Vertically transmitted symbionts in structured host metapopulations.

Mats Gyllenberg1, Diana Preoteasa, Kari Saikkonen

  • 1Department of Mathematics, University of Turku, FIN-20014 Turku, Finland. mats.gyllenberg@utu.fi

Bulletin of Mathematical Biology
|October 24, 2002
PubMed
Summary
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Mutualism and high symbiont transmission are crucial for symbiont survival in host metapopulations. Evolution favors complete host infection, especially in uniform environments, impacting host-symbiont coexistence.

Area of Science:

  • Ecology
  • Evolutionary Biology
  • Mathematical Modeling

Background:

  • Vertically transmitted symbionts are common in natural populations.
  • Understanding symbiont survival in structured host populations is key.
  • The role of mutualism in symbiont persistence is debated.

Purpose of the Study:

  • To model symbiont survival in structured host metapopulations.
  • To determine if mutualism and high transmission are required for symbiont persistence.
  • To identify conditions for host-symbiont coexistence.

Main Methods:

  • Development of a structured metapopulation model.
  • Analysis of symbiont invasion and host-symbiont coexistence.
  • Mathematical derivation of conditions for uniform and heterogeneous environments.

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Main Results:

  • Mutualism is essential for host-symbiont coexistence in uniform metapopulations.
  • High symbiont transmission rates are critical for symbiont survival.
  • Evolutionary pressures drive metapopulations towards 100% infection frequency.
  • Conditions for invasion in heterogeneous environments were established.

Conclusions:

  • Mutualism and high transmission are prerequisites for symbiont survival in structured metapopulations.
  • Coexistence is contingent on symbiont-mediated host fitness benefits.
  • Metapopulation dynamics can lead to fixation of infected hosts.