Md. Ochando et A. Reyes, Genetic population structure in olive fly Bactrocera oleae (Gmelin): gene flow and patterns of geographic differentiation, J APPL ENT, 124(3-4), 2000, pp. 177-183
Citations number
57
Categorie Soggetti
Entomology/Pest Control
Journal title
JOURNAL OF APPLIED ENTOMOLOGY-ZEITSCHRIFT FUR ANGEWANDTE ENTOMOLOGIE
Four wild Spanish populations of Bactrocera oleae (Gmelin) (Dipt., Tephriti
dae) were studied by gel electrophoresis, in order to find out their popula
tion genetic structure and the relative importance of gene flow in that str
ucture. A great amount of genetic variability was observed. In terms of the
pattern of the genetic variability in our populations, the most noticeable
characteristics were the similarity of the configuration of allelic freque
ncies from locality to locality, the existence of exceptions and quantitati
ve differences within that similarity, and the heterogeneity among the vari
able loci. Gene flow estimated from Wright's method gave a value of Nm = 8.
9. However, the F-ST statistic in three of the loci ranged from 0.0451 to 0
.0620 indicating a substantial degree of differentiation among populations
(P < 0.001). The present observations seem to support the hypothesis that a
lthough gene flow could be high (Nm = 8.9), 'natural' selection, probably d
ue to agricultural practices, may be the major factor responsible for the p
attern of the genetic variability observed in B. oleae.