干旱区生态环境知识资源中心(Arid): Tracking a blue wave of ephemeral water across arid southern Africa

Arid

DOI	10.1088/1748-9326/ac98d9
	Tracking a blue wave of ephemeral water across arid southern Africa
	Schaffer-Smith, Danica; Swift, Margaret; Killea, Allison; Brennan, Angela; Naidoo, Robin; Swenson, Jennifer J.
通讯作者	Swenson, JJ
来源期刊	ENVIRONMENTAL RESEARCH LETTERS
ISSN	1748-9326
出版年	2022
卷号	17 期号:11
英文摘要	Surface water in arid regions is essential to many organisms including large mammals of conservation concern. For many regions little is known about the extent, ecology and hydrology of ephemeral waters, because they are challenging to map given their ephemeral nature and small sizes. Our goal was to advance surface water knowledge by mapping and monitoring ephemeral water from the wet to dry seasons across the Kavango-Zambezi Transfrontier Conservation Area of southern Africa (300 000 km(2)). We mapped individual waterholes for six time points each year from mid-2017 to mid-2020, and described their presence, extent, duration, variability, and recurrence. We further analyzed a wide range of physical and landscape aspects of waterhole locations, including soils, geology, and topography, to climate and soil moisture. We identified 2.1 million previously unmapped ephemeral waterholes (85%-89% accuracy) that seasonally extend across 23.5% of the study area. We confirmed a distinct 'blue wave' with ephemeral water across the region peaking at the end of the rainy season. We observed a wide range of waterhole types and sizes, with large variances in seasonal and interannual hydrology. We found that ephemeral surface water was associated with loam soils in the study area. From the wettest time period to the driest, there was a similar to 44 000 km(2) (62%) decrease in ephemeral water extent across the region-these dramatic seasonal fluctuations have implications for wildlife movement. A warmer and drier climate, expected human population growth, and associated agricultural expansion and development may threaten these sensitive and highly variable water resources and the wildlife that depend on them.
英文关键词	hydrology Okavango Delta satellite remote sensing spatio-temporal analysis wildlife movement
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:000886527800001
WOS关键词	TOPOGRAPHIC WETNESS INDEX ; GLOBAL CLIMATE-CHANGE ; SURFACE-WATER ; WETLANDS ; WORLDS ; CONNECTIVITY ; HABITAT ; DEPTH ; CONSERVATION ; BIODIVERSITY
WOS类目	Environmental Sciences ; Meteorology & Atmospheric Sciences
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/392510
推荐引用方式 GB/T 7714	Schaffer-Smith, Danica,Swift, Margaret,Killea, Allison,et al. Tracking a blue wave of ephemeral water across arid southern Africa[J],2022,17(11).
APA	Schaffer-Smith, Danica,Swift, Margaret,Killea, Allison,Brennan, Angela,Naidoo, Robin,&Swenson, Jennifer J..(2022).Tracking a blue wave of ephemeral water across arid southern Africa.ENVIRONMENTAL RESEARCH LETTERS,17(11).
MLA	Schaffer-Smith, Danica,et al."Tracking a blue wave of ephemeral water across arid southern Africa".ENVIRONMENTAL RESEARCH LETTERS 17.11(2022).