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Genetic investigations on Ips typographus populations in authochthonus and allochthonous areas.

Stauffer Christian, Projektleiter/in
Art der Forschung
Angewandte Forschung
Universität Sopron, Sopron, Ungarn.
Funktion des Projektpartners: Koordinator
Beteiligte BOKU-Organisationseinheiten
Institut für Forstentomologie, Forstpathologie und Forstschutz
Gefördert durch
Austrian Development Agency (ADA), Zelinkagasse , 1010 Wien, Österreich
Final Report by Lakatos: The genetic structure of Ips typographus (L.) populations from autochthonous and allochthonous Picea abies ((L.) Karsten) stands in West-Hungary was investigated using isozyme electrophoresis. 38 % of the investigated loci were polymorphic. As our study showed, the genetic structure of the I. typographus populations was homogenous. Differentiation among populations were estimated using heterozygosity calculations, FST statistics and by the estimation of gene flow. The FST statistics indicates that 1.1% of the variance is due genetic differentiation among populations and 98.9% of the variance is within the population. The inbreeding coefficients (FIS AND FIT) is significantly higher in the I. typographus populations from allochthonous spruce stands than from autochthonous ones. The estimation of gene flow after Slatkin's graphical method (1978) differed between autochthonous and allochthonous spruce stands. The allochthonous regions of P. abies may be geographical restricted for I. typographus because the diffuse presence of the host plant, which appear also in the genetic structure of the beetle populations. Theory is presented for the genetic process influencing the physiological population structure depending on the beetle migration. The possible role of genetic dissimilarities in the autochthonous and allochthonous stands according the bark beetle outbreaks are discussed.
Ips typographus;

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