Université de Fribourg

Fighting their last stand? A global analysis of the distribution and conservation status of gymnosperms

Fragnière, Yann ; Bétrisey, Sébastien ; Cardinaux, Léonard ; Stoffel, Markus ; Kozlowski, Gregor

In: Journal of Biogeography, 2015, vol. 42, no. 5, p. 809–820

Aim: Gymnosperms are often described as a marginal and threatened group, members of which tend to be out-competed by angiosperms and which therefore preferentially persist at higher latitudes and elevations. The aim of our synthesis was to test these statements by investigating the global latitudinal and elevational distribution of gymnosperms, as well as their conservation status, using all...

Université de Fribourg

Dating past geomorphic processes with tangential rows of traumatic resin ducts

Stoffel, Markus

In: Dendrochronologia, 2008, vol. 25, no. 1, p. 53-60

Past activity of geomorphic processes can be reconstructed on tree-ring series using the presence of injuries, reaction wood or abrupt changes in the annual increment. The analysis of these features provides valuable data on years with process activity. In contrast, an intra-annual dating has so far normally only been possible through the analysis of injuries. In this technical note, it is shown...