Genetic population structure of the German cockroach, Blattella germanica:Absence of geographical variation

Citation
A. Cloarec et al., Genetic population structure of the German cockroach, Blattella germanica:Absence of geographical variation, ENT EXP APP, 92(3), 1999, pp. 311-319
Citations number
34
Categorie Soggetti
Entomology/Pest Control
Journal title
ENTOMOLOGIA EXPERIMENTALIS ET APPLICATA
ISSN journal
00138703 → ACNP
Volume
92
Issue
3
Year of publication
1999
Pages
311 - 319
Database
ISI
SICI code
0013-8703(199909)92:3<311:GPSOTG>2.0.ZU;2-U
Abstract
The genetic structure of 31 populations of the German cockroach, Blattella germanica (L.), located in two French cities 900 km apart, was estimated by enzyme gel electrophoresis. A set of 41 loci was analysed. Eight loci (4 E st, 3 Lap and 1 Got) were polymorphic. Diversity was estimated at different geographical levels: the overall population, between cities and within a c ity. Hierarchical F-statistics indicated significant genetic differentiatio n between all populations and among populations within each city, but no di fferentiation between cities. F-ST values for populations within each city and for the overall sample were substantially dissimilar. In addition, a cl uster analysis did not separate populations according to their geographical origin but according to the predominance of either of the two alternative Est-4 alleles. The results of this analysis point to the absence of genetic differentiation on a large geographical scale: no large-scale geographical distance effect was detected. However, we evidenced strong genetic substru cturing on a local scale, within cities.