Betula Globispica - Version 2014.3. Shaw, K., Roy, S., & Wilson, B. In The IUCN Red List of Threatened Species, pages 194567/0+. 2014.
abstract   bibtex   
[Excerpt] The~species is endemic to Japan and is only found in the~Chubu~(central) and Kantō (eastern)~districts of the island of Honshu. The total distribution area of the two regions where this species is reported to be found is c.110,000 km2.~Much of this area is mountainous, which is the habitat type that this species prefers, however, it is reported to be rare within its range and to exist as small subpopulations. The area of occupancy is therefore estimated to be approaching the threshold value for qualifying as Vulnerable (nearly 2,000 km2). Presence on mountain areas means these subpopulations may be genetically isolated.\textasciitilde This species is susceptible to drought, even as a relatively well-established tree, and land clearance. Its existence as small populations also makes these populations susceptible to human activities, such as land clearance. Future decline in area of occupancy, and loss of subpopulations, are therefore projected. This could further reduce area of occupancy of B. globispica and the species would therefore qualify as Vulnerable under criterion B2ab(ii,iv). Field research is required to verify the current distribution of this species, and determine if it should already be placed within a threatened category. This species was assessed as Rare in the 1997 IUCN Red List of Threatened Plants. This species is reported to be a conservation priority by Ashburner and McAllister (2013). It is assessed here as Near Threatened, almost qualifying as Vulnerable. [::Range Description] The~species is endemic to Japan and is only found in the~Chubu~(central) and Kantō (eastern)~districts of the island of Honshu.~The total extent of occurrence of the two districts where this species is reported to be found is c.110,000 km2. It exists as small subpopulations within its range and therefore the area of occupancy is estimated to be low. Field surveys are required to determine actual area of occupancy, but it is estimated to be approaching the threshold to be considered Vulnerable (c. 3,000 km2~with threshold of~2,000 km2). [::Countries] Native:Japan (Honshu) [::Population] Betula globispica is a very distinct relict species from Honshu with no very close living relatives anywhere else in the world. It exists as small subpopulations within its range and is described as rare in the wild. This species grows on steep mountain slopes and rock outcrops and populations are therefore considered to be fragmented. [::Habitat and Ecology] A tree growing to about 21 m, Betula globispica~is found on steep mountain slopes and rocky outcrops. It is very sensitive to drought, even as a relatively well-established young tree. It thrives on very heavy clay which, although wet, does not become waterlogged. [::Use and Trade] There is no use or trade information available for this species. [::Major Threat(s)] This species is susceptible to drought, even as a relatively well-established tree, which could lead to future declines, potentially exacerbated by climate change. Its existence as small subpopulations also makes these populations susceptible to pest and disease and human activities, such as land clearance.
@incollection{shawBetulaGlobispicaVersion2014,
  title = {Betula Globispica - {{Version}} 2014.3},
  booktitle = {The {{IUCN Red List}} of {{Threatened Species}}},
  author = {Shaw, K. and Roy, S. and Wilson, B.},
  year = {2014},
  pages = {194567/0+},
  abstract = {[Excerpt] The~species is endemic to Japan and is only found in the~Chubu~(central) and Kant\=o (eastern)~districts of the island of Honshu. The total distribution area of the two regions where this species is reported to be found is c.110,000 km2.~Much of this area is mountainous, which is the habitat type that this species prefers, however, it is reported to be rare within its range and to exist as small subpopulations. The area of occupancy is therefore estimated to be approaching the threshold value for qualifying as Vulnerable (nearly 2,000 km2). Presence on mountain areas means these subpopulations may be genetically isolated.\textasciitilde{} This species is susceptible to drought, even as a relatively well-established tree, and land clearance. Its existence as small populations also makes these populations susceptible to human activities, such as land clearance. Future decline in area of occupancy, and loss of subpopulations, are therefore projected. This could further reduce area of occupancy of B. globispica and the species would therefore qualify as Vulnerable under criterion B2ab(ii,iv). Field research is required to verify the current distribution of this species, and determine if it should already be placed within a threatened category. This species was assessed as Rare in the 1997 IUCN Red List of Threatened Plants. This species is reported to be a conservation priority by Ashburner and McAllister (2013). It is assessed here as Near Threatened, almost qualifying as Vulnerable. [::Range Description] The~species is endemic to Japan and is only found in the~Chubu~(central) and Kant\=o (eastern)~districts of the island of Honshu.~The total extent of occurrence of the two districts where this species is reported to be found is c.110,000 km2. It exists as small subpopulations within its range and therefore the area of occupancy is estimated to be low. Field surveys are required to determine actual area of occupancy, but it is estimated to be approaching the threshold to be considered Vulnerable (c. 3,000 km2~with threshold of~2,000 km2). [::Countries] Native:Japan (Honshu) [::Population] Betula globispica is a very distinct relict species from Honshu with no very close living relatives anywhere else in the world. It exists as small subpopulations within its range and is described as rare in the wild. This species grows on steep mountain slopes and rock outcrops and populations are therefore considered to be fragmented. [::Habitat and Ecology] A tree growing to about 21 m, Betula globispica~is found on steep mountain slopes and rocky outcrops. It is very sensitive to drought, even as a relatively well-established young tree. It thrives on very heavy clay which, although wet, does not become waterlogged. [::Use and Trade] There is no use or trade information available for this species. [::Major Threat(s)] This species is susceptible to drought, even as a relatively well-established tree, which could lead to future declines, potentially exacerbated by climate change. Its existence as small subpopulations also makes these populations susceptible to pest and disease and human activities, such as land clearance.},
  keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-13621323,betula-globispica,conservation,forest-resources,iucn,iucn-near-threatened-nt},
  lccn = {INRMM-MiD:c-13621323}
}
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