Fruits of Pterocarya rhoifolia, Royal Botanic Garden Edinburgh
Royal Botanic Garden Edinburgh – the paradise of Pterocarya researchers

Understanding the ecology of a species requires expeditions to its country of origin and visiting its wild populations. However, field explorations are often cost- and time-consuming, especially when lacking a solid background on the species that we want to study. The Royal Botanic Garden in Edinburgh (UK) offers a unique alternative and allows studying different species of the genus Pterocarya found in its ex-situ collections. 2016 we have visited the garden twice and been able to observe the most important criteria of differentiation between the species (especially terminal buds, leaflet and nuts) and bring back numerous pictures and knowledge, which will be very helpful for future expeditions in wild populations of Pterocarya in Asia. We would like to thank warmly Peter Brownless of the Royal Botanic Garden of Edinburgh for his precious help and advice.

Alfaroa williamsii
Juglandaceae of Neotropis: Alfaroa and Oreomunnea

In April 2016 our Zelkova-team organized a scientific expedition to Costa Rica in order to explore and collect iconographic material of poorly known Juglandaceae of Neotropis. Costa Rica is center of species diversity for two genera of this family: Alfaroa (minimum 4 species) and Oreomunnea (2 species). They are typical elements of mountain forests and are growing often accompanied by some other trees belonging to temperate families and genera (e.g., Quercus, Alnus, etc.)

Participans of the workshop representing 10 countries
Workshop “Relict trees in peril"

Between the 4th and 7th of July 2016 a workshop entitled “Relict trees in peril: conservation challenges and research projects across Eurasia” organized by our Zelkova-team took place in Tbilisi, Georgia (in collaboration with the Ilia State University, National Botanic Garden of Georgia and Rustaveli State University). Invited speakers from Switzerland, Italy, Poland, Iran, Azerbaijan, China, Vietnam and Japan as well as Georgian scientists presented their research projects and conservation actions carried out in different countries and regions from the Mediterranean to Eastern Asia. The symposium was followed by a scientific expedition to Western Georgia in order to visit natural populations of Zelkova carpinifolia and Pterocarya fraxinifolia and to discuss with local stakeholders the long term conservation of the relict forests of the Colchis region.

Pupils planting their tree
Ex situ plantation of Zelkova abelicea with primary school of Skine-Fourne (Crete)

As part of the Zelkova abelicea conservation project, an ex situ plantation was established in the Levka Ori with the involvement of the Municipality of Platanias, the Forest Directorate of Chania (FDC), the Mediterranean Agronomic Institute of Chania (MAICh) and the local Primary school of Skine-Fourne.

Lopota river overflows frequently into adjacent lands and forest, creating favorable ecological condition for P. fraxinifolia.
Relict trees in Georgia: new conservation actions

In the framework of the project on "Pterocarya and Juglandaceae", a research expedition was held during August 2015 across Georgia, in order to investigate the present situation of Pterocarya fraxinifolia stands in riparian forests and propose the most suitable protection measures. Dr Nino Davitashvili, our leading scientist in Georgia, had already a great experience of Pterocarya forests and could guide researchers from Switzerland to the most interesting and endangered communities. This expedition was also an opportunity to explore the last remnants of Zelkova carpinifolia forests and to analyse precisely their structure and diversity. This work was done by Daniel Ducry (University of Fribourg) as part of his Master’s Degree focused on Zelkova forest from the Mediterranean region to the Southern Caucasus.


Project Zelkova addresses five main objectives

  1. Basic and applied research on relict, rare and/or threatened woody species (biogeography, conservation biology, phylogeny, phylogeography, population genetics, population structure, dendrochronology, etc.).
  2. Conservation actions (in situ and ex situ conservation), action plans and conservation status assessments.
  3. Capacity building (teaching, internships, exchange of students and young scientists, etc.).
  4. Public awareness and outreach (exhibitions, books, workshops, etc.).
  5. Iconographic collections (scientific photography, scientific drawings, etc.)

Zelkova abelicea

Zelkova sicula

Conservation biogeography of Pterocarya & Juglandaceae

Relict and threatened woody species of Azerbaijan

Relict trees of China, Taiwan, Vietnam, South Korea and Japan

Local conservation & research projects, exhibitions, discoveries.