Betula Megrelica - Version 2014.3. Shaw, K., Roy, S., & Wilson, B. In The IUCN Red List of Threatened Species, pages 194596/0+. 2014.
abstract   bibtex   
[Excerpt] This species is listed as Endangered in view of the extent of occurrence (EOO)~and the area of occupancy (AOO). Current observations meet area thresholds for assessing this species as Critically Endangered, but suitable habitat has been identified close to these localities. It is therefore assessed as Endangered and further field research is recommended to determine if this species does qualify in a higher threat category. Its existence is also limited to two locations, and there is an observed continuing decline in the area, extent and quality of habitat and number of mature individuals, caused by wood extraction for fuel and grazing.~This species is listed as Vulnerable in the Red List of Georgia (2006) and the Red List of the Endemic Plants of the Caucasus (2014). Both of these assessments are based on a provisional assessment undertaken during a Global Trees Specialist Group meeting in Tbilisi in 2005. Since then additional survey work has led to reduced estimates for extent of occurrence and area of occupancy. This species is therefore assessed in a higher threat category here. This assessment has been verified by members of the IUCN/SSC Caucasus Plant Red List Authority. [::Common Name(s)] [::]English - Megrelian Birch [::Taxonomic Notes] REF.: N. Ketskhoveli, A. Kharadze and R. Gagnidze (eds.) 1 75. Flora of Georgia. 2nd ed. Tbilisi. Vol. III. 276 p. (in Georgian) Sosnovskiy, D. I. 1 34. In: Trudy Tiflisskogo botanicheskogo instituta I: 42. (in Russian) (Y̏RSy̧rchary̧roy̧rchary̧rsy̧rchary̧rny̧rchary̧roy̧rchary̧rvy̧rchary̧rsy̧rchary̧rky̧rchary̧riy̧rchary̧rishrt, Y̏RD. Y̏RI. 1 34. Y̏RTy̧rchary̧rr. Y̏RTy̧rchary̧riy̧rchary̧rfy̧rchary̧rl. y̧rchary̧rby̧rchary̧roy̧rchary̧rt. y̧rchary̧riy̧rchary̧rny̧rchary̧rsy̧rchary̧rt. I: 42) The Plant List (2010). Version 1. Published on the Internet; http://www.theplantlist.org/ (accessed 14th July, 2011). [::Range Description] This species is endemic to Georgia.~It was previously known from one specimen taken from Mount Migaria in 1934 by D. Sosnovsky. In 2013, two populations were located on Mount Migaria and Mount Jvari in the Mingrelia region. The population on Mount Jvari was estimated to spread for three kilometres along the north face of the ridge, covering an area of 3.0 km by 0.5 km. The population on Mount Migaria is estimated to spread over a potential area of 2.0 km by 0.5 km. Estimates suggest there may be up to eight fragmented subpopulations and suitable habitat in nearby localities has been identified. These estimates would increase the extent of occurrence (EOO) and area of occupancy (AOO), but both are estimated to remain low. EOO is estimated as 100-200 km2~and is unlikely to increase above 5,000 km2~and AOO is estimated as 3-12 km2~and is unlikely to exceed~500 km2. There are two threat based locations. Further field study is needed to verify if this species qualifies in a higher threat category based on its distribution. [::Countries] Native:Georgia [::Population] There are thought to be four to eight fragmented subpopulations within the two locations (Mount Migaria and Mount Jvari). Even if additional subpopulations are identified, it is thought that total population will remain low.~The population is thought to be decreasing due to identified threats.~No detailed population information is available for this species and it would benefit from further field research to gather population information. [::Habitat and Ecology] It grows in subalpine crook-stemmed forest at 1,700-2,000 m asl and sometimes descends to 1,200-1,400 m asl.~At high elevations it forms dense thickets and dwarf forests on grassy slopes. It can also be found growing from the sides of rock outcrops with little soil. At lower elevations the shrub grows smaller and sparser. It is likely that the shrubs are covered by snow throughout the winter season.~Betula megrelica is a small shrub, one to four metres in height, with several main stems radiating from just above soil level. These stems are often horizontal or even downward curving.~Betula~megrelica has a similar appearance to B. medwedwiewii but has much smaller, narrower leaves and smaller fruiting catkins. The habitat requirements for this species are very specific. It must be high enough to suppress the growth of taller species, steep enough to avoid damage from grazing livestock, in an area where the aspect is between north and east, and on limestone.~\textasciitilde [::Use and Trade] There is no use or trade information available for this species. [::Major Threat(s)] The main threat to this species is overgrazing from livestock and wild animals, which causes damage to the trunk and stems. Shrubs growing at lower elevations are more at risk from overgrazing. Other threats include poor forest management and uncontrolled logging. Although this species is located within the Samegrelo Planned Protected Area, there seems at present little to no control on the use or misuse of the resources on the ground. This species has very specific habitat requirements, therefore if some suitable habitat is lost this will threaten regeneration ability.
@incollection{shawBetulaMegrelicaVersion2014,
  title = {Betula Megrelica - {{Version}} 2014.3},
  booktitle = {The {{IUCN Red List}} of {{Threatened Species}}},
  author = {Shaw, K. and Roy, S. and Wilson, B.},
  year = {2014},
  pages = {194596/0+},
  abstract = {[Excerpt] This species is listed as Endangered in view of the extent of occurrence (EOO)~and the area of occupancy (AOO). Current observations meet area thresholds for assessing this species as Critically Endangered, but suitable habitat has been identified close to these localities. It is therefore assessed as Endangered and further field research is recommended to determine if this species does qualify in a higher threat category. Its existence is also limited to two locations, and there is an observed continuing decline in the area, extent and quality of habitat and number of mature individuals, caused by wood extraction for fuel and grazing.~This species is listed as Vulnerable in the Red List of Georgia (2006) and the Red List of the Endemic Plants of the Caucasus (2014). Both of these assessments are based on a provisional assessment undertaken during a Global Trees Specialist Group meeting in Tbilisi in 2005. Since then additional survey work has led to reduced estimates for extent of occurrence and area of occupancy. This species is therefore assessed in a higher threat category here. This assessment has been verified by members of the IUCN/SSC Caucasus Plant Red List Authority. [::Common Name(s)] [::]English - Megrelian Birch [::Taxonomic Notes] REF.: N. Ketskhoveli, A. Kharadze and R. Gagnidze (eds.) 1 75. Flora of Georgia. 2nd ed. Tbilisi. Vol. III. 276 p. (in Georgian) Sosnovskiy, D. I. 1 34. In: Trudy Tiflisskogo botanicheskogo instituta I: 42. (in Russian) (\cyrchar\CYRS\cyrchar\cyro\cyrchar\cyrs\cyrchar\cyrn\cyrchar\cyro\cyrchar\cyrv\cyrchar\cyrs\cyrchar\cyrk\cyrchar\cyri\cyrchar\cyrishrt, \cyrchar\CYRD. \cyrchar\CYRI. 1 34. \cyrchar\CYRT\cyrchar\cyrr. \cyrchar\CYRT\cyrchar\cyri\cyrchar\cyrf\cyrchar\cyrl. \cyrchar\cyrb\cyrchar\cyro\cyrchar\cyrt. \cyrchar\cyri\cyrchar\cyrn\cyrchar\cyrs\cyrchar\cyrt. I: 42) The Plant List (2010). Version 1. Published on the Internet; http://www.theplantlist.org/ (accessed 14th July, 2011). [::Range Description] This species is endemic to Georgia.~It was previously known from one specimen taken from Mount Migaria in 1934 by D. Sosnovsky. In 2013, two populations were located on Mount Migaria and Mount Jvari in the Mingrelia region. The population on Mount Jvari was estimated to spread for three kilometres along the north face of the ridge, covering an area of 3.0 km by 0.5 km. The population on Mount Migaria is estimated to spread over a potential area of 2.0 km by 0.5 km. Estimates suggest there may be up to eight fragmented subpopulations and suitable habitat in nearby localities has been identified. These estimates would increase the extent of occurrence (EOO) and area of occupancy (AOO), but both are estimated to remain low. EOO is estimated as 100-200 km2~and is unlikely to increase above 5,000 km2~and AOO is estimated as 3-12 km2~and is unlikely to exceed~500 km2. There are two threat based locations. Further field study is needed to verify if this species qualifies in a higher threat category based on its distribution. [::Countries] Native:Georgia [::Population] There are thought to be four to eight fragmented subpopulations within the two locations (Mount Migaria and Mount Jvari). Even if additional subpopulations are identified, it is thought that total population will remain low.~The population is thought to be decreasing due to identified threats.~No detailed population information is available for this species and it would benefit from further field research to gather population information. [::Habitat and Ecology] It grows in subalpine crook-stemmed forest at 1,700-2,000 m asl and sometimes descends to 1,200-1,400 m asl.~At high elevations it forms dense thickets and dwarf forests on grassy slopes. It can also be found growing from the sides of rock outcrops with little soil. At lower elevations the shrub grows smaller and sparser. It is likely that the shrubs are covered by snow throughout the winter season.~Betula megrelica is a small shrub, one to four metres in height, with several main stems radiating from just above soil level. These stems are often horizontal or even downward curving.~Betula~megrelica has a similar appearance to B. medwedwiewii but has much smaller, narrower leaves and smaller fruiting catkins. The habitat requirements for this species are very specific. It must be high enough to suppress the growth of taller species, steep enough to avoid damage from grazing livestock, in an area where the aspect is between north and east, and on limestone.~\textasciitilde{} [::Use and Trade] There is no use or trade information available for this species. [::Major Threat(s)] The main threat to this species is overgrazing from livestock and wild animals, which causes damage to the trunk and stems. Shrubs growing at lower elevations are more at risk from overgrazing. Other threats include poor forest management and uncontrolled logging. Although this species is located within the Samegrelo Planned Protected Area, there seems at present little to no control on the use or misuse of the resources on the ground. This species has very specific habitat requirements, therefore if some suitable habitat is lost this will threaten regeneration ability.},
  keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-13621335,betula-megrelica,conservation,forest-resources,iucn,iucn-endangered-en},
  lccn = {INRMM-MiD:c-13621335}
}
Downloads: 0
About
Documentation
Keywords
Search
Users
Terms and Conditions of Use
Privacy Policy
Sitemap
© BibBase.org 2021