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Related Experiment Videos

Coevolution between hosts and parasites with partially overlapping geographic ranges.

S L Nuismer1, J N Thompson, R Gomulkiewicz

  • 1Section of Integrative Biology, University of Texas, Austin, TX, USA. snuismer@uidaho.edu

Journal of Evolutionary Biology
|December 3, 2003
PubMed
Summary

Coevolutionary hot spots drive host evolution when parasite overlap is significant. Increased parasite range paradoxically leads to decreased parasite adaptation, potentially limiting their geographical spread.

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Area of Science:

  • Evolutionary Biology
  • Ecology
  • Genetics

Background:

  • Host-parasite interactions often occur in only a fraction of the host's geographical range.
  • Geographical overlap can create coevolutionary hot spots with reciprocal selection.
  • Host evolution may be influenced by factors outside these hot spots.

Purpose of the Study:

  • To evaluate the importance of coevolutionary hot spots for host and parasite evolution.
  • To analyze a spatially explicit genetic model of host-parasite interactions with partial range overlap.

Main Methods:

  • Analysis of a spatially explicit genetic model.
  • Modeling host-parasite interactions with varying degrees of geographical overlap.
  • Investigating the impact of hot spot configuration on coevolutionary dynamics.

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Main Results:

  • A critical level of overlap is required for reciprocal selection to drive host coevolution.
  • Beyond this threshold, stable allele frequency clines and local maladaptation emerge.
  • Further overlap leads to oscillations, synchronous allele frequencies, and absence of local maladaptation.

Conclusions:

  • Parasite adaptation is inversely proportional to the fraction of the host's range occupied.
  • Expanding parasite geographical range can lead to increased maladaptation.
  • This suggests a novel mechanism limiting parasite geographical range expansion.