We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleGenetic variation in a heterogeneous environment. II. Temporal heterogeneity and directional selection.AuthorsHedrick PWPublicationGenetics, 1976, Vol 84, Issue 1, p145ISSN0016-6731Publication typearticleDOI10.1093/genetics/84.1.145