title: Selection for migration modification.
abstract: Simple models for the genetic control of the tendency to migrate are considered. It is shown that migration from a more favorable regime to a less favorable regime is selected against. The ramifications for general modifier theory are discussed.
authors.affiliation: Department of Mathematics, La Trobe University, Bundoora, Victoria 3083, Australia.
authors.forename: B J
authors.initials: BJ
authors.lastname: Balkau
authors.forename: M W
authors.initials: MW
authors.lastname: Feldman