K. Lerdthusnee et T. Chareonviriyaphap, Comparison of isozyme patterns of Aedes aegypti populations collected frompre- and post-Bacillus thuringiensis israelensis treatment sites in Thailand, J AM MOSQ C, 15(1), 1999, pp. 48-52
Citations number
10
Categorie Soggetti
Entomology/Pest Control
Journal title
JOURNAL OF THE AMERICAN MOSQUITO CONTROL ASSOCIATION
Isozyme patterns of 13 field-collected populations of Aedes aegypti from Th
ailand were compared using starch gel electrophoresis. Three populations we
re collected before the Bacillus thuringiensis var. israelensis, (B.t.i.) a
pplication was initiated. The other 10 populations were collected after the
B.t.i. treatment. Results revealed that the number of polymorphic loci wer
e lower in the B.t.i. treated populations as compared to controls. In addit
ion, lower genetic variability was found in populations collected from B.t.
i. treated sites (Mae Ka Sa [KS] and Mae Kud Luang [KL] village). These res
ults are most likely due to a genetic bottleneck produced by the B.t.i. tre
atment. Heterozygosity increased in the months following B.t.i. treatment,
probably because of immigration when the control program was withdrawn. How
ever, the anticipated reduction in the expected heterozygosity was only obs
erved in the KS site. This may be due to preexisting low heterozygosity in
the KL population. No fixed differences in alleles were detected among the
13 populations.