Éditeur(s) : HAL CCSD
Résumé :  
For a comprehensive evaluation of human influences on the genetic system, the simulation model EGO-GENE was developed. The model combines population genetic and population dynamic processes with forest growth models. The dynamics of genetic structures (single locus and multilocus genotypes up to 200 loci) can be simulated. Spatial and temporal genetic dynamics are included in the model. Overlapping or separated generations can be created and different modes of mating systems can be implemented. The model can be run with empirical and fictitious input data. The simulated genetic structures can be directly analysed with established genetic analysis programmes. An example demonstrates the use of the model far validation of interactions among components of the mating system. Another example demonstrates the applicability of the model in decision-making for seed sampling strategies. The genetic differences between the adult trees and the harvested seeds and the danger of genetic drift regarding to different seed sampling strategies are investigated by use of the genetic distance and the reproductively effective population size.
Silvae genetica

hal-01032083
https://hal.archives-ouvertes.fr/hal-01032083

Éditeur(s) : HAL CCSD
Résumé :  
The spatial genetic differentiation among European beech stands in western Germany was analysed by a new method. The genetic structure at 8 enzyme gene loci of 100 sampled populations was used as data base. The data represent authors' own results and published data from 8 different studies. For 10 geographic distance classes [h] from 0 to 500 km, the average genetic distance between the populations for each single gene locus, a gene-pool distance and the semivariances of genetic diversity gam were computed. Significant deviation from random spatial genetic structure was tested by permutation analysis. In many cases (Lap-B, Mdh-B, Mdh-C and 6Pgdh-C) the mean genetic distance between stands with spatial distance up to 200 km was significantly smaller and the genetic distance between stands with geographic distances of 200 and 400 km was significantly greater than expected for random spatial genetic structure. Similar tendencies were found for the gene-pool distance and the semivariances of diversity. Kriging, as a method for spatial interpolation, was used to draw synthetic maps of the spatial patterns of allelic frequencies and genetic diversity. The influence of postglacial recolonisation and regeneration with foreign seed material on the spatial genetic patterns are discussed
Forest genetics

hal-01032093
https://hal.archives-ouvertes.fr/hal-01032093