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The maintenance and breakdown of distyly


American Naturalist 114(4): 499-514
The maintenance and breakdown of distyly
An algebraic analysis of the equilibrium reached as a result of the opposition of selection and recombination in a heterostyled population is described. When the fitness of a selfed progeny is sufficiently small compared with that of outcrossed progeny, the frequencies of the self-fertile recombinant pbenotypes can be expected to be of roughly the same order of magnitude as the frequencies of the corresponding crossover events. Data from population surveys suggest that these frequencies must be less than 10-3. The possibility of ordering the component loci of the heterostyly supergene is discussed. The breakdown of heterostyly due, e.g., to inefficient insect pollination is also investigated. The self-fertile homostyle with the dominant allele for pollen type will usually replace heterostyly. This agrees with data on a number of genera containing both heterostyled and secondarily homostyled species.


Accession: 006712964

DOI: 10.2307/2460366



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