Bouleau transcaucasien
Betula medwediewiiRegel
Pays · région · aire protégée · écorégion · biome
Graphe en cours d’indexation
Calcul du tissu écologique de Betula medwediewii.
Le graphe apparaîtra automatiquement dès que le calcul est terminé (rafraîchissement toutes les 5s).
Liste rouge IUCN
DD · Données insuffisantes↘Décroissante- Évaluation
- 2020 · v3.1
- Altitude
- 600 – 2400 m
- Profondeur
- – m
État de la populationTexte officiel évaluation IUCNExpert
Betula medwediewii is one of a group of rare relic trees and shrubs found in the western Transcaucasus and the adjacent mountains of northeastern Turkey. It is a very rare birch. It is found in small groups in Georgia where it exists in only in very small populations in a couple of areas of Adjara (south western Georgia). These subpopulations are very small, fragile and unstable. Population studies are advised to better determine population numbers.
Menaces identifiées(2 menaces classées CMP-IUCN)
2_3_2Small-holder grazing, ranching or farmingUnknownUnknownOngoing7_1_3Trend Unknown/UnrecordedUnknownUnknownOngoing
Description complète des menacesTexte détaillé évaluation IUCNExpert
This species is threatened by local grazing. This birch species is very slow-growing, so grazing of apical growth by both wild and domesticated animals removes the plants ability to flower and produce seed. Grazing destroys the fruiting bodies located near the growing tips and it is unlikely that the fragile seed can withstand animal digestive acids and pass out in faeces intact (seeds are not winged so cannot be dispersed by wind). Grazing is having clear implications on the small subpopulations of this species in Georgia, a country with a poor economy and little control of forestry and farming activities. In Georgia, plants are also reported as at risk due to forestry activities and forest fires.
Habitats préférentiels (classification IUCN)
1_4Forest - Temperate3_4Shrubland - Temperate
Mesures de conservation recommandéesStratégies de conservation IUCNExpert
B. medwediewii is reported as held in 62 ex situ collections (BGCI 2017). It is self-compatible. Population studies and study into the impact of local threats across this species' range are advised to devise appropriate conservation measures. This work is planned for 2017 in Georgia.
This species was previously listed as Rare in Turkey and indeterminate globally in the 'European Red List' (1991) and as Endangered in Georgia in the 'Rare, Endangered and Vulnerable Plants of the Republic of Georgia'. The Red List of the Endemic Plants of the Caucasus (2014) lists this species as Vulnerable under criterion B1ab(iii,iv). This was based on a provisional assessment undertaken in 2005 at an IUCN/SSC Global Tree Specialist Group workshop in Tbilisi.
This species was previously listed as Rare in Turkey and indeterminate globally in the 'European Red List' (1991) and as Endangered in Georgia in the 'Rare, Endangered and Vulnerable Plants of the Republic of Georgia'. The Red List of the Endemic Plants of the Caucasus (2014) lists this species as Vulnerable under criterion B1ab(iii,iv). This was based on a provisional assessment undertaken in 2005 at an IUCN/SSC Global Tree Specialist Group workshop in Tbilisi.
Stress écologiques (5)Stresses Classification — IUCNExpert
1_2Ecosystem degradation2_1Species mortality2_1Species mortality2_2Species disturbance2_3_7Reduced reproductive success
Priorités de recherche (2)Research Needed Classification — IUCNExpert
1_2Population size, distribution & trends1_5Threats
Niche IUCN globaleRealms · Systems · LMEs · Growth forms · FAOs — biogéographie IUCNExpert
Royaumes biogéographiques
Palearctic
Systèmes (terrestre/eau douce/marin)
Terrestrial
Formes de croissance
Shrub - largeTree - small
Références bibliographiques (14)Sources scientifiques de l'évaluation IUCNExpert
- IUCN. 2020. The IUCN Red List of Threatened Species. Version 2020-2. Available at: <a href="www.iucnredlist.org">www.iucnredlist.org</a>. (Accessed: 13 June 2020).
- IUCN. 2018. The IUCN Red List of Threatened Species. Version 2018-1. Available at: <a href="www.iucnredlist.org">www.iucnredlist.org</a>. (Accessed: 28 June 2018).
- BGCI. 2017. PlantSearch. Botanic Gardens Conservation International, London. Available at: <a href="https://www.bgci.org/plant_search.php">https://www.bgci.org/plant_search.php</a>.
- G. Schatz, T. Shulkina and J. Solomon (eds). 2014. <i>Red List of the Endemic Plants of the Caucasus Region</i>. Missouri Botanical Garden Press, Saint Louis, MO, USA. (in press).
- Govaerts, R. 2013. World Checklist of Betulaceae. Facilitated by the Royal Botanic Gardens, Kew Available at: <a href="http://www.kew.org/wcsp/">http://www.kew.org/wcsp/</a>.
- Missouri Botanical Garden. 2013. Tropicos. Saint Louis, Missouri. Available at: <a href="www.tropicos.org">www.tropicos.org</a>.
- Ashburner, K. and McAllister, H.A. 2013. <i>The Genus </i>Betula<i>: A Taxonomic Revision of Birches</i>. Kew Publishing, Richmond, Surrey.
- USDA, ARS, National Genetic Resources Program. 2013. Germplasm Resources Information Network, GRIN (Online database). Beltsville, Maryland Available at: <a href="http://www.ars-grin.gov/cgi-bin/npgs/html/family.pl?144">http://www.ars-grin.gov/cgi-bin/npgs/html/family.pl?144</a>. (Accessed: December 13).
- Bartlett, P. 2013. Searching for birches. <i>The Plantsman</i>: 112-117.
- The Plant List. 2010. The Plant List. Available at: <a href=" http://www.theplantlist.org/"> http://www.theplantlist.org/</a>. (Accessed: 2013).
- Shetekauri, S. and Jacoby, M. 2009. <i>Mountain Flowers and Trees of Caucasia</i>. Koeltz Scientific Books, Germany.
- European Commission for Europe. 1991. <i>European Red List of globally threatened animals and plants</i>. United Nations, New York.
- Davis, P.H. (ed.). 1965-1985. <i>Flora of Turkey and the East Aegean Islands</i>. Vols. I-X. University Press, Edinburgh.
- M. Eristavi, T. Shulkina, S. Sikhuralidze, L. Asieshvili. Rare, Endangered and Vulnerable Plants of the Republic of Georgia. St Louis Available at: <a href="http://www.mobot.org/MOBOT/research/georgia/welcome.shtml">http://www.mobot.org/MOBOT/research/georgia/welcome.shtml</a>. (Accessed: 14/01/14).
Évaluateurs & contributeurs (4)Personnes ayant contribué à l'évaluation IUCNExpert
assessor
Wilson, B., Shaw, K. & Roy, S.
contributor
Batsatsashvili, K.
evaluator
Manvelidze, Z., Memiadze, N., Goginashvili, N. & Kharazishvili, D.
facilitators
Beech, E.
⚠ 1 erratum publié après l'évaluation.
Wilson, B., Shaw, K. & Roy, S. 2020. Betula medwediewii (amended version of 2018 assessment). The IUCN Red List of Threatened Species 2020: e.T194575A171688828. Accessed on 05 May 2026.
Distribution mondiale
Calcul de la distribution GBIF· ~10–60 s
Phénologie
Calcul du calendrier d'apparition· ~5–30 s
Consulter sur les bases externes
Note nomenclaturale & synonymesDétails taxonomiques + synonymes CoLExpert
Note nomenclaturale
TAXREF v18 — INPN/MNHNSynonymes (1)— redirigent vers cette page
- Betula megrelicaSosn.
Sources : Catalogue of Life Cross-References (synonymes) · TAXREF v18 INPN/MNHN (commentaires FR).