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| Desert and Xeric Shrublands | |
|---|---|
| Name | Desert and Xeric Shrublands |
| Biome | Xeric shrubland |
| Continents | Africa, Asia, Australia, Europe, North America, South America |
| Climate | Arid, semi-arid |
| Conservation status | Varies by ecoregion |
Desert and Xeric Shrublands are biomes characterized by low rainfall, sparse vegetation, and specialized biota. These regions include famous drylands such as the Sahara Desert, Arabian Desert, Great Victoria Desert, Mojave Desert, and Patagonian Desert, and they occur across multiple continents where temperature extremes and water scarcity shape ecosystems and human cultures. They are studied in contexts including United Nations Environment Programme, International Union for Conservation of Nature, World Wildlife Fund, Conservation International, and regional institutions.
"Desert and Xeric Shrublands" refers to terrestrial ecoregions classified by organizations like the World Wide Fund for Nature, defined by aridity indices used by Food and Agriculture Organization and climatologists at National Aeronautics and Space Administration, National Oceanic and Atmospheric Administration, and research centers such as the Smithsonian Institution. Major geographic examples include the Sahara Desert in Algeria, Egypt, Morocco; the Kalahari Desert in Botswana and Namibia; the Thar Desert in India and Pakistan; the Gobi Desert in China and Mongolia; the Atacama Desert in Chile; the Sonoran Desert and Chihuahuan Desert in United States and Mexico. Notable regional designations appear in national inventories compiled by agencies like the United States Geological Survey, Geological Survey of India, Australian Bureau of Meteorology, and programs such as the Convention on Biological Diversity.
Climates range from hyperarid centers like the Rub' al Khali to cold deserts such as parts of the Antarctic Dry Valleys and elevations on the Tibetan Plateau monitored by Intergovernmental Panel on Climate Change scenarios. Seasonal patterns are governed by systems including the Hadley Cell, monsoon circulations affecting the Deccan Plateau, and subtropical highs influencing the Mediterranean Basin. Important climatic metrics are precipitation measured by Global Precipitation Measurement and evapotranspiration monitored in studies from European Space Agency and National Center for Atmospheric Research. Soil processes involve loess deposits studied by the Geological Society of America and aeolian dynamics observed in collaborations with the United Nations Convention to Combat Desertification.
Plant communities include xerophytes such as cacti in the Cactoideae family across the Sonoran Desert, drought-deciduous shrubs in the Mediterranean Basin, and succulent perennials in the Karoo of South Africa. Adaptive traits have been documented in literature from institutions like Royal Botanic Gardens, Kew and Missouri Botanical Garden: CAM photosynthesis in Agave and Opuntia, deep rooting in species of Prosopis and Acacia, and leaf morphology in genera like Atriplex and Larrea. Plant-animal mutualisms involve pollinators such as species studied by Smithsonian Tropical Research Institute and seed dispersers catalogued by researchers at Royal Society publications. Restoration practitioners from The Nature Conservancy apply techniques such as assisted regeneration and erosion control permitting recovery in degraded sites like former grazing lands in Patagonia.
Faunal assemblages include large mammals like the dromedary in the Arabian Peninsula, the oryx in Namibia, and the guanaco in Patagonia; predators include the cheetah in Africa and the kit fox in North America. Bird communities contain specialists such as the sandgrouse in Sahel countries, while invertebrate diversity features taxa studied by Natural History Museum, London and California Academy of Sciences. Trophic interactions are shaped by water sources such as oases documented in studies by National Geographic Society and ephemeral resource pulses following rare rain events recorded by International Research Institute for Climate and Society. Disease ecology and invasive species concerns are addressed by agencies like the Centers for Disease Control and Prevention and Australian Department of Agriculture.
Human activities include pastoralism in regions administered by governments of Mongolia, Ethiopia, and Morocco; mineral extraction in zones governed by companies in Western Australia, Chile, and Nevada; and urban expansion around cities like Phoenix, Arizona, Riyadh, and Perth. Historical trade routes such as the Silk Road and Trans-Saharan trade crossed xeric shrublands, influencing cultures preserved in museums like the British Museum and Louvre. Contemporary conservation efforts involve networks coordinated by IUCN, funding from the Global Environment Facility, and protected areas designated under laws in United States National Park Service, South African National Parks, and Australian National Heritage List. Threats include desertification tackled by the UNCCD, groundwater depletion monitored by World Bank programs, and climate change adaptation explored by Intergovernmental Panel on Climate Change assessments.
Representative ecoregions are catalogued by WWF and include the Chihuahuan Desert, Mojave Desert, Great Sandy-Tanami Desert, Karakum Desert, Dasht-e Kavir, Monte Desert, and the PatagonianSteppe as delineated in national atlases and academic works from University of Oxford, Harvard University, and University of California, Davis. Case studies appear in literature from institutions such as Yale School of the Environment, Columbia University, and Australian National University, documenting conservation strategies in areas like the Namib Desert and restoration projects in the Sonoran Desert’s Tonto National Forest. International collaborations include programs by BirdLife International, research networks at Max Planck Society, and multidisciplinary projects funded by the European Commission.