Skip to Main Content
A pocket of variability in Pinus rigidaAuthor(s): F. Thomas Ledig; John H. Fryer
Source: Evolution 26:259-266
Publication Series: Miscellaneous Publication
PDF: View PDF (202 KB)
DescriptionSteady state gene frequencies around a pocket of differential fitness have been formulated by Hanson (1966) in a generalization of the work of Haldane (1948). A pocket of differential fitness would result in a pocket-of-variability, assuming that the radius of the area of contrasting fitness was large in relation to the vagility of the organism. Conversely, the absence of a pocket-of-variability is predicted whenever dispersal is broad relative to the size of the pocket of differential fitness. Around the pocket, a cline would be established through the interaction of migration and selection. The slope of the cline would depend on the width of the band of intermediate fitness, being steepest where the band was absent. The change in gene frequency with distance from the pocket would be rapid in the band of intermediate fitness values and approach limiting values asymptotically in the areas of contrasting fitness.
- You may send email to email@example.com to request a hard copy of this publication.
- (Please specify exactly which publication you are requesting and your mailing address.)
- We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
- This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
CitationLedig, F. Thomas; Fryer, John H. 1971. A pocket of variability in Pinus rigida. Evolution 26:259-266
- Genetic structure of American chestnut populations based on neutral DNA markers
- Separating the effects of habitat area, fragmentation and matrix resistance on genetic differentiation in complex landscapes
- Simulating natural selection in landscape genetics
XML: View XML