干旱区生态环境知识资源中心(Arid): Endangered Dracaena ombet Population in the Red Sea Hills, Sudan, Recovers After Abrupt Change

Arid

DOI	10.3389/fenvs.2022.793583
	Endangered Dracaena ombet Population in the Red Sea Hills, Sudan, Recovers After Abrupt Change
	Andersen, Gidske L.; Krzywinski, Knut; Talib, Mohammed; Musa, Mohammed A. M.
通讯作者	Andersen, GL
来源期刊	FRONTIERS IN ENVIRONMENTAL SCIENCE
EISSN	2296-665X
出版年	2022
卷号	10
英文摘要	The endangered and endemic Nubian dragon blood tree, Dracaena ombet, has been feared extirpated from core distribution areas in the Red Sea Hills, Sudan, after reported mass death events in the 20(th) century. Populations of dragon tree species are generally reported to be in decline, with a noticeable lack of recruitment and possible poor resilience. Rare recruitment events are, however, normal for species with remnant population dynamics, and when eventually occurring, such events can restore seemingly degraded populations. In response to recently reported observations of dracaena saplings in a historically core distribution area of the Red Sea Hills, we assess the status of this long-lived arboreal species. We describe a current realized niche, investigate a potential range shift by comparing the spatial distribution of saplings and older individuals, and assess population recovery based on pre-disturbance system identity derived from qualitative, historical observations. We document a beginning recovery of the dracaena population in the study area. Around half of the mapped population are individuals in the sapling stage, and they are in good health. Its current realized niche is described by higher altitudes, steeper slopes, more concave landscape forms and east-facing aspects compared to areas where dracaena individuals are absent. However, for the new generation of dracaena saplings we find signs of a leaning range shift where saplings are shifted towards higher altitudes near the mist-influenced escarpment. A full collapse and eventual extirpation of the endangered Dracaena ombet population may at best be averted, or at least delayed in the study area. Our resilience analysis indicates that a full recovery will be a slow process due to the inherent natural climate variability of arid lands, only allowing sporadic regeneration. Considering this species' information legacy, saplings seem to be well equipped to survive such variability, but perhaps within a restricted safe operating space. Conservation measures should therefore be taken to secure the survival of the new generation along with broader spatial scale studies to confirm whether our findings reflect a regional phenomenon.
英文关键词	nubian dragon blood tree resilience recovery leaning range shift abrupt change IUCN red list GIS mist influence
类型	Article
语种	英语
开放获取类型	gold
收录类别	SCI-E
WOS记录号	WOS:000788652700001
WOS关键词	DRAGON TREE ; VEGETATION CHANGES ; CLIMATE-CHANGE ; MIST OASIS ; DYNAMICS ; CONSERVE ; KOTSCHY ; SOCOTRA ; GROWTH ; SHIFTS
WOS类目	Environmental Sciences
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392733
推荐引用方式 GB/T 7714	Andersen, Gidske L.,Krzywinski, Knut,Talib, Mohammed,et al. Endangered Dracaena ombet Population in the Red Sea Hills, Sudan, Recovers After Abrupt Change[J],2022,10.
APA	Andersen, Gidske L.,Krzywinski, Knut,Talib, Mohammed,&Musa, Mohammed A. M..(2022).Endangered Dracaena ombet Population in the Red Sea Hills, Sudan, Recovers After Abrupt Change.FRONTIERS IN ENVIRONMENTAL SCIENCE,10.
MLA	Andersen, Gidske L.,et al."Endangered Dracaena ombet Population in the Red Sea Hills, Sudan, Recovers After Abrupt Change".FRONTIERS IN ENVIRONMENTAL SCIENCE 10(2022).