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A comparison of levels of genetic polymorphism and self-compatibility in geographically restricted and widespread plant congeners

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Summary

Evolutionary theory predicts low levels of genetic polymorphism and high levels of self-compatibility in plant species with small ranges and few individuals. To test these predictions, I compared published data on electrophoretically detectable genetic variation and breeding systems for geographically restricted and widespread congeners in eleven genera. The restricted species exhibit significantly fewer polymorphic loci and alleles per polymorphic locus than do their widespread congeners. Although some rare species are genetically impoverished, others are nearly as polymorphic as their widespread congeners. The restricted species and their widespread congeners do not differ consistently with respect to breeding systems.

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  1. Department of Environmental, Population and Organismic Biology, University of Colorado, Campus Box B-334, 80309, Boulder, Colorado, USA

    Jeffrey D. Karron

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Karron, J.D. A comparison of levels of genetic polymorphism and self-compatibility in geographically restricted and widespread plant congeners. Evol Ecol 1, 47–58 (1987). https://doi.org/10.1007/BF02067268

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