干旱区生态环境知识资源中心(Arid): Effect of elevation on floristic diversity, life forms and chorotypes in the Al-Hada mountain escarpment, Saudi Arabia

Arid

DOI	10.1007/s11629-022-7514-3
	Effect of elevation on floristic diversity, life forms and chorotypes in the Al-Hada mountain escarpment, Saudi Arabia
	Fadl, Mohamed A.; Al-Yasi, Hatim M.; Alsherif, Emad A.
通讯作者	Alsherif, EA
来源期刊	JOURNAL OF MOUNTAIN SCIENCE
ISSN	1672-6316
EISSN	1993-0321
出版年	2022
卷号	19 期号:10 页码:2806-2816
英文摘要	Mountains are biodiversity hotspots, and due to their unique microclimatic circumstances, they host a vast range of endemic species. There are two main hypotheses, the Rapoport and the mid-domain effect hypotheses, which explain how elevation and species richness are linked. The current study was conducted in the Al-Hada escarpment, which is a unique area in the world. It is located on the border of Eurasia and Africa, where there are a lot of plant species from both places. The study aimed to detect the effect of elevation on the floristic composition of the study area. The obtained results showed that the Al-Hada escarpment flora consists of 297 species belonging to 194 genera and fifty-seven distinct families. Only two families, Poaceae and Asteracae, had 22% of the whole recorded species. The obtained results showed that with increasing elevation, the numbers of species, genera, and families increased, in accordance with the Rapoport hypothesis. The numbers of families increased by 62% from the lowest elevation to the highest one, while the numbers of both species and genera increased by more than two-folds. Therophytes exhibited the maximum number, which was 44%, and Chamaephytes came in second with 25%. Phanerophytes and hemicryptophytes made up 13% and 11% of all life forms, respectively, while geophytes made up just 7%. Monoregional elements represented 33.2% of the total recorded species, where Saharo-Sindian species had the most monoregional species, accounting for around 13% of the total species. At the highest elevation, succulents accounted for 7.6% of the research area, whereas N-fixing plants accounted for 6.2%. At the highest elevation, they had the lowest value, and at the middle elevation, they had the highest value. With the rise in elevation, the neotropical, endemic, and Mediterranean elements rose. Succulents and N-fixing species did not show a clear relationship with the elevation but exhibited the lowest value at the highest elevation, and vice versa. Therophytes and geophytes increased while the number of hemicryptophytes decreased with elevation. Surprisingly, phanerophytes did not show any relationship with elevation, while, with the rise in elevation, the pan-tropical, endemic, and Mediterranean elements rose. Neotropical and Saharo-Sindian elements decreased with the rise in elevation. Considering our results, we can conclude that the relationship of taxa diversity with the different altitude of the arid subtropical regions' mountains, whose elevation does not exceed 2000 m (without human disturbance), confirms the Rapoport hypothesis.
英文关键词	Rapoport hypothesis Mid-domain effect Arid land Mountain Altitude Al-Hada escarpment
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000873887900005
WOS关键词	SPECIES RICHNESS ; RAPOPORTS RULE ; VEGETATION COMPOSITION ; ALTITUDINAL GRADIENT ; PLANT LIFE ; REGION ; BIODIVERSITY ; CLIMATE ; DESERT ; RANGE
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/2XILL650/393557
推荐引用方式 GB/T 7714	Fadl, Mohamed A.,Al-Yasi, Hatim M.,Alsherif, Emad A.. Effect of elevation on floristic diversity, life forms and chorotypes in the Al-Hada mountain escarpment, Saudi Arabia[J],2022,19(10):2806-2816.
APA	Fadl, Mohamed A.,Al-Yasi, Hatim M.,&Alsherif, Emad A..(2022).Effect of elevation on floristic diversity, life forms and chorotypes in the Al-Hada mountain escarpment, Saudi Arabia.JOURNAL OF MOUNTAIN SCIENCE,19(10),2806-2816.
MLA	Fadl, Mohamed A.,et al."Effect of elevation on floristic diversity, life forms and chorotypes in the Al-Hada mountain escarpment, Saudi Arabia".JOURNAL OF MOUNTAIN SCIENCE 19.10(2022):2806-2816.