Abstract
Significant correlations between allelic frequencies and environmental variables in a number of insect species have been demonstrated by multivariate techniques. Since many environmental variables show a strong relationship to geographic location and since gene flow between populations can also produce patterns of gene frequencies which are related to the geographic location, both selection and gene-flow hypotheses are consistent with the observed correlations. The genetic variables can be corrected for geographic location and so for linear gene-flow patterns. If, after correction, the genetic variables still show significant correlations with similarly corrected environmental variables, then these correlations are consistent with hypotheses of selection but not of gene flow. The data of Johnson and Schaffer (1973) have been reanalyzed using the method of canonical correlation after correction for geographical location by means of multiple regression. Five of the nine loci studied exhibit significant canonical correlations. These results, under the assumption of linear gene flow, support hypotheses of selective action of environmental variables in the genotype-environment relationships observed.
Full Text
The Full Text of this article is available as a PDF (405.9 KB).
Selected References
These references are in PubMed. This may not be the complete list of references from this article.
- Johnson F. M., Schaffer H. E. Isozyme variability in species of the genus Drosophila. VII. Genotype-environment relationships in populations of D. melanogaster from the Eastern United States. Biochem Genet. 1973 Oct;10(2):149–163. doi: 10.1007/BF00485762. [DOI] [PubMed] [Google Scholar]
- Kojima K., Smouse P., Yang S., Nair P. S., Brncic D. Isozyme frequency patterns in Drosophila pavani associated with geographical and seasonal variables. Genetics. 1972 Dec;72(4):721–731. doi: 10.1093/genetics/72.4.721. [DOI] [PMC free article] [PubMed] [Google Scholar]