title: Four simultaneously stable polymorphic equilibria in two-locus two-allele models.
abstract: The existence of four simultaneously stable equilibria with both loci polymorphic is shown for the Lewontin-Kojima version of the two-locus two-allele symmetric viability model, using bifurcation theory. This exceeds the previously claimed bound of two stable polymorphisms. Biological implications of the result are discussed.
authors.affiliation: Department of Mathematics and Division of Environmental Studies, University of California, Davis, California 95616.
authors.forename: A
authors.initials: A
authors.lastname: Hastings