Polymorphic inversion and esterase loci complex on chromosome 2 of Drosophila buzzatii. II. Spatial variation.
The potential influence of linked inversions on allele frequency variation at the Est-1 and Est-2 loci among Australian populations of D. buzzatii was determined by statistical analyses allele and inversion gametic frequencies. Most of the significant spatial and climatic associations found for all Est-1 allele frequencies, and for one allele only of Est-2 (Est-2c+), were accounted for by their linkage disequilibria with the inversions, which covaried with environmental variables. Consistent with this result, the spatial and climatic associations for conditional Est-1 and Est-2 allele frequencies tended to be different from those for the respective unadjusted allele frequencies. In one important respect, the results for Est-1 and Est-2 were not altered by inversions. For both unadjusted and conditional Est-1 allele frequencies, few climatic associations remain after correcting for geographic location, whereas for both unadjusted and conditional Est-2 allele frequencies, climatic associations remain after correcting for geographic location. Thus, apparent selection affecting allele frequencies at the Est-2 locus is not accounted for by linked inversions.
Knibb
W R
WR
Department of Animal Science, University of New England, Armidale, N.S.W.
Barker
J S
JS
D000483:Alleles; D000818:Animals; D001315:Australia; D007446:Chromosome Inversion; D004330:Drosophila / Q000235:genetics*; D004950:Esterases / Q000235:genetics*; D005787:Gene Frequency; D011110:Polymorphism, Genetic; D012044:Regression Analysis
D004950:Esterases