This project aims to quantify the genetic diversity and population structure of five native tree species in Switzerland and assess their adaptation to future environmental conditions and their suitability as forest genetic resources. The focus is on genetic conservation areas and rare tree species, as well as a dominant tree species serving as a reference. Additionally, the genetic diversity of the seed from one rare tree species will be examined in detail to derive recommendations for seed collection. The results should help to assess the genetic diversity and representativeness of dominant and secondary tree species in genetic conservation areas, identify potential gaps in the existing network, provide practical recommendations for seed production, determine suitable seed collection sites, and ultimately promote rare tree species.