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The insect‐pollinated forest tree Tilia cordata Mill. grows today in small fragmented populations in Denmark and other western European countries but was, in prehistoric times, a dominating species and is considered an indicator species for ancient forest. The species is known to propagate both sexually and vegetatively, forming clonal groups. Few...
Aim The Hyrcanian forests, in a region of lowland and montane temperate pure and mixed broadleaf forests located in Iran, near the southern shores of the Caspian Sea, form part of the Caucasus biodiversity hotspot. In this region, species experienced suitable and stable environmental conditions over historic periods and even some Arcto‐Tertiary rel...
We assessed the level of geographic differentiation of Tilia cordata in Denmark based on tests of 91 trees selected from 12 isolated populations. We used quantitative analysis of spring phenology and population genetic analysis based on SSR markers to infer the likely historical genetic processes within and among populations. High genetic variation...
Abstract: Today Tilia cordata (Mill.) are only found in small, scattered and fragmented populations in Denmark, but earlier it was a dominating tree species (approx. 7000-500 BC). The species has only rarely been planted as it has not been of silvicultural interest and today is therefore commonly accepted as an indicator for ancient forest (Lawesso...
About 30 years ago we found a genetic explanation for why silver fir (Abies alba) of Calabrian origin showed an extraordinary vitality and adaptability, when grown outside its home region (including Denmark) (Larsen 1986). It turned out that silver fir from this southern Italian region had a higher genetic variability compared to fir from the rest of the species' range (Bergmann, Gregorius and Larsen 1990, Larsen 1994). This startling discovery has since been explained by genetic drift in the different refugia during the last Ice Age, where the Calabrian refugium ensured good conditions for the species' “wintering”, maintaining the natural genetic variation, while the refugia(s) from which silver fir immigrated to Central and northern Europe, have undergone genetic bottlenecks due to poor climate conditions during the last ice age with loss of genetic variation and thus adaptability. The objective of the project is to carry out studies of genetic variability and adaptability of silver fir and beech, from Calabria using new DNA analysis methods (not available in the 1980's) and to establish some provenance trials in Denmark.