干旱区生态环境知识资源中心(Arid): Notes on the phytogeography and conservation status of the genus Acanthopsis (Acantheae, Acanthaceae)

Arid

DOI	10.11646/phytotaxa.415.4.1
	Notes on the phytogeography and conservation status of the genus Acanthopsis (Acantheae, Acanthaceae)
	Steyn, Hester M.1,2; Von Staden, Lize 3; Bellstedt, Dirk U.4; Van Der Merwe, Pieter D. W.4; Van Wyk, Abraham E.1,2
通讯作者	Steyn, Hester M.
来源期刊	PHYTOTAXA
ISSN	1179-3155
EISSN	1179-3163
出版年	2019
卷号	415 期号:4 页码:157-178
英文摘要	Acanthopsis is a genus endemic to southern Namibia and southwestern South Africa. Until recently the taxonomy of the group was poorly understood. As a result of a new taxonomic framework (recognising 20 species), the risk of extinction of each taxon could be reassessed and updated. This contribution presents an overview of the distribution and conservation status of the species, as well as the patterns and possible processes involved in the phytogeography of the genus. Specimen localities for all examined specimens were georeferenced and these values were used for mapping and conservation assessments. Phylogenetic relationships within Acanthopsis were studied by using sequence data from the following six gene regions: nrITS, matK, rbcL, rps16, rpl32-trnL and trnS-trnG-trnG. The group appears to have diversified in the arid mountainous semi-desert of the Richtersveld, Northern Cape, South Africa, with the vast majority (96%) of Acanthopsis taxa endemic or near-endemic to the Succulent Karoo Region (more or less congruent with the Succulent Karoo Biome). Twenty of the 23 taxa are range-restricted and have an Extent of Occurrence <= 10000 km(2), with at least eight of these known from only one or two subpopulations each. Fourteen (61%) of the taxa are Red Listed as Least Concern, while 39% are Red Listed as Threatened (Vulnerable, Endangered and Critically Endangered)-mainly as a result of habitat loss due to overgrazing and trampling by domestic livestock. Although the distribution ranges of most members of Acanthopsis coincide with protected areas, the effectiveness of conservation in these regions is questionable as some protected areas are prone to overgrazing and trampling by domestic livestock. The lack of phylogenetic resolution, complex taxonomy and the high numbers of range-restricted and habitat-specific species implies recent speciation in Acanthopsis due to topography, ecological gradients and climatic conditions prevailing in the arid northwestern parts of South Africa's Northern Cape and adjacent arid parts of southern Namibia.
英文关键词	Biomes endemism extinction risk Gariep Centre of Endemism local centres of endemism phylogeny Succulent Karoo
类型	Article
语种	英语
国家	South Africa
收录类别	SCI-E
WOS记录号	WOS:000483727400001
WOS关键词	TRIBE ACANTHEAE ; TAXONOMIC NOTES ; PHYLOGENETIC-RELATIONSHIPS ; SOUTH-AFRICA ; EVOLUTION ; REGIONS ; ANGIOSPERMS ; JUSTICIEAE ; PATTERNS ; HISTORY
WOS类目	Plant Sciences
WOS研究方向	Plant Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/217985
作者单位	1.South African Natl Biodivers Inst, Natl Herbarium, Private Bag X101, ZA-0001 Pretoria, South Africa; 2.Univ Pretoria, Dept Plant & Soil Sci, HGWJ Schweickerdt Herbarium, ZA-0002 Pretoria, South Africa; 3.South African Natl Biodivers Inst, Biosystemat Res & Biodivers Collect Div, Private Bag X101, ZA-0001 Pretoria, South Africa; 4.Univ Stellenbosch, Dept Biochem, ZA-7602 Stellenbosch, South Africa
推荐引用方式 GB/T 7714	Steyn, Hester M.,Von Staden, Lize,Bellstedt, Dirk U.,et al. Notes on the phytogeography and conservation status of the genus Acanthopsis (Acantheae, Acanthaceae)[J],2019,415(4):157-178.
APA	Steyn, Hester M.,Von Staden, Lize,Bellstedt, Dirk U.,Van Der Merwe, Pieter D. W.,&Van Wyk, Abraham E..(2019).Notes on the phytogeography and conservation status of the genus Acanthopsis (Acantheae, Acanthaceae).PHYTOTAXA,415(4),157-178.
MLA	Steyn, Hester M.,et al."Notes on the phytogeography and conservation status of the genus Acanthopsis (Acantheae, Acanthaceae)".PHYTOTAXA 415.4(2019):157-178.