The effect of population density on gene flow between adult trees and the seedling bank in Abies alba Mill
Jarosław Paluch , Marcin Zarek , Marta Kempf
AbstractPopulations of smaller efective sizes or subjected to strong environmental fltering have a higher risk of stochastic changes in their genetic properties. This study tested the hypothesis that reducing the density of parent trees combined with environmental fltering during the stage of regeneration establishment afects gene fow between the parent and ofspring populations of Abies alba Mill. The genetic variation and spatial genetic structure of parent trees and seedlings were compared in the Western Carpathians (southern Poland) in 27 stands with varying adult tree and regeneration densities. The analysis comprised 1592 individuals and was based on fve nuclear microsatellite markers. The proportion of stands with signifcant spatial genetic structure in the adult tree and seedling cohorts increased as the density of adult trees decreased. The genetic diferentiation between adult trees and seedlings expressed by the fxation index FST was between 0.005 and 0.021 and increased as the density of adult trees decreased but was not correlated with the seedling abundance. At the within-stand level, the analysis revealed shifts in the average number of alleles per locus (between − 15% and + 28%), the observed heterozygosity (between − 25% and + 20%) and expected heterozygosity (between − 8% and + 11%) between the populations of adult trees and seedlings. It was concluded that in mixed stands with densities of A. alba trees about 50 adult individuals per ha, there may be some risk of reduced efective population size and disturbed vertical gene fow, but signifcant shifts in the level of genetic variation are less likely.
|Journal series||European Journal of Forest Research, ISSN 1612-4669, e-ISSN 1612-4677, (N/A 100 pkt)|
|Publication size in sheets||0.7|
|Keywords in English||Natural regeneration, Mixed forest, Spatial genetic structure, Genetic distance, Genetic isolation, Seed trees|
|Publication indicators||= 0; : 2018 = 1.149; : 2018 = 2.354 (2) - 2018=2.629 (5)|
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