Abstract
The genetic diversity of natural populations is a key factor in the success of long-term ecosystem protection. We studied the genetic diversity and spatial genetic structure (SGS) in three endangered shrub birch (Betula humilis) populations using seven nuclear microsatellite loci. The highest genetic variation was found in the restored Szuszalewo population in Biebrza National Park, where active prevention of thicket forest succession was recently conducted. The results of bottleneck tests were not statistically significant in each locality, although a genetic indication for population reduction was detected in the Rospuda stand, which is not actively protected. The Bayesian clustering, principal coordinates analysis, and FST estimates revealed the greatest difference between Magdzie Bagno and Rospuda samples. SGS was found in all B. humilis stands; however, it was the strongest in the Rospuda locality, where pollen and seed dispersal was limited by dense clusters of shrub birch ramets scattered among forest and brushwood plants. The weakest SGS, also supported by finding some sibling pairs in distant locations, was observed in the Szuszalewo population. The aforementioned results indicate that the active protection practices may impose an immediate beneficial effect on the restoration and maintenance of the B. humilis populations.
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