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The temporal dynamics of the genetic diversity of the Norway spruce population provide valuable information on the conservation and management of its genetic resources. The relationships between genetic and demographic parameters are of fundamental importance for understanding the adaptability of forest tree populations. The study was aimed at determining the genetic differentiation of five age classes of a naturally regenerating  Picea abies  population from the Białowieża Primeval Forest (BPF) in Poland. Using mitochondrial DNA markers  (nad1  intron b/c;  mt15-D02)  and nuclear DNA microsatellites (EAC2C08; EATC2B02; EATC2G05; SpAGD1) we determined the genetic structure between and within the age classes of the  P. abies  population. The significant subdivision of genetic variation (F st ) detected across the age classes is comparable to those found between different populations of this species. Two microsatellite loci behaved as “outlier loci,” exhibiting directional selection as revealed in the LOSITAN analysis. The significant deficit of heterozygosity may be a consequence of a temporal Wahlund effect and selective processes favoring homozygotes in the specific environment of the BPF. Population genetic structure can vary among life stages as a result of multiple factors, such as pollen and seed dispersal patterns, density of trees, past reproductive episodes, site conditions, and selective processes.

Temporal dynamics in the genetic structure of a natural population of Picea abies