ALLOZYME GENOTYPE-ENVIRONMENT RELATIONSHIPS. I. VARIATION IN NATURAL POPULATIONS OF DROSOPHILA PACHEA

Remarkable geographic and seasonal uniformities in gene and genotype frequencies were found for four enzyme loci. Principal component analysis revealed two patterns of allele frequency changes in three of the allozyme loci (Est-b, Est-c and Acph) and one pattern in the Mdh-d locus. These patterns ac...

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Bibliographic Details
Published in:Genetics (Austin) 1973-01, Vol.73 (1), p.135-146
Main Authors: Rockwood-Sluss, E. S, Johnston, J. S, Heed, W. B
Format: Article
Language:English
Subjects:
Acid Phosphatase - analysis
Alleles
Animals
Drosophila - enzymology
Environment
Esterases - analysis
Female
Gene Frequency
Genetic Variation
Genotype
Investigations
Malate Dehydrogenase - analysis
Male
Mexico
NAD
Seasons
Selection, Genetic
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Summary:Remarkable geographic and seasonal uniformities in gene and genotype frequencies were found for four enzyme loci. Principal component analysis revealed two patterns of allele frequency changes in three of the allozyme loci (Est-b, Est-c and Acph) and one pattern in the Mdh-d locus. These patterns accounted for 90% to 100% of the variability at these loci. Significant positive correlations were obtained between several of the components and the variability in the non-saponifiable and alkaloid fractions of the senita cactus host plant. The genetic variance within a single locality (Guaymas, Mexico) was as great as the variance between all localities sampled. This is interpreted as a local founder effect. The temporary nature of the rotting cactus breeding site, the delayed maturation and the differential maturation rate of females and males are three factors proposed to cause forced outbreeding and counter the local founder effect. A combination of selection resulting from a direct interaction of the genotype and the environment, in addition to migration, is proposed to maintain the uniform gene frequencies.
ISSN:0016-6731
1943-2631
1943-2631
DOI:10.1093/genetics/73.1.135