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Are tick populations really less variable and should they be?

L R Hilburn, P W Sattler

    Heredity
    |August 1, 1986
    PubMed
    Summary
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    Genetic variability in Metastriate ticks contradicts previous theories. Tick population size, host specificity, and host mobility better explain genetic patterns than environmental heterogeneity.

    Area of Science:

    • Zoology
    • Genetics
    • Ecology

    Background:

    • Previous theories predicted low genetic variability within Metastriate tick populations and significant differences between populations.
    • These predictions were often based on models of spatial environmental heterogeneity.

    Purpose of the Study:

    • To empirically test the theoretical predictions regarding genetic variability in Metastriate ticks.
    • To identify more accurate explanatory factors for observed genetic patterns in these ectoparasites.

    Main Methods:

    • Electrophoretic examinations were conducted on Metastriate ticks.
    • Genetic data were analyzed to assess intra- and inter-population variability.

    Main Results:

    • Empirical evidence did not support the prediction of low genetic variability within populations and large interpopulation differences.

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  • The existing theoretical model based on environmental heterogeneity proved inadequate.

    • Conclusions:

    • Host mobility, tick population size, and host specificity are more effective predictors of genetic variability in Metastriate ticks.
    • Rethinking theoretical models is necessary for understanding tick population genetics.