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Related Experiment Videos

Parasite-associated polymorphism in a cyclic ungulate population

F M Gulland1, S D Albon, J M Pemberton

  • 1Department of Zoology, University of Cambridge, U.K.

Proceedings. Biological Sciences
|October 22, 1993
PubMed
Summary
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Gastrointestinal nematodes impact Soay sheep survival during population crashes. Specific adenosine deaminase (Ada) genotypes influence both parasite burden and mortality risk, suggesting parasite-driven selection maintains Ada allele frequencies.

Area of Science:

  • Population dynamics
  • Parasitology
  • Genetics

Background:

  • Soay sheep populations on St. Kilda exhibit cyclical instability.
  • Population crashes are linked to winter food scarcity.
  • Gastrointestinal nematodes are prevalent in this sheep population.

Purpose of the Study:

  • To investigate the role of gastrointestinal nematodes in Soay sheep population dynamics.
  • To determine if adenosine deaminase (Ada) genotypes affect sheep survival during population crashes.
  • To explore the relationship between Ada genotypes and nematode burdens.

Main Methods:

  • Experimental nematode removal in Soay sheep.
  • Monitoring survival rates during population crashes.
  • Genotyping sheep at the adenosine deaminase (Ada) locus.

Related Experiment Videos

  • Quantifying fecal nematode egg counts across different genotypes and seasons.

    • Main Results:

    • Sheep experimentally treated for nematodes showed improved survival during population crashes.
    • Mortality rates during crashes varied significantly among Ada genotypes (FF, SS, FS).
    • Nematode burdens differed significantly between Ada genotypes, with variations observed in females and males across seasons.

    Conclusions:

    • Nematode parasites contribute to Soay sheep mortality during population crashes.
    • Parasite-associated selection acting on the adenosine deaminase (Ada) locus may maintain allele frequencies in the population.