Atacama-Sechura Deserts - A Global Ecoregion
Some areas receive virtually no rain
Snapshot: Ecoregion 133
Size:
290,000 sq. km (112,000 sq. miles)
Habitat type:
Deserts and Xeric Shrublands
Pacific Coast of South America: Chile and Peru
Conservation Status:
Vulnerable
Quiz Time!
Why are Atacama-Sechura Deserts so dry?
Answer:
Mainly because of their position along the Pacific Ocean. When the Humboldt current brings cold water from the Antarctic to the Pacific, it creates cold air at the surface of the ocean but warm air higher up. This produces a lot of fog and low clouds but no rain. Some parts of the ecoregion are so influenced by the Humboldt current that they can go without rain for years.
About the Area
This ecoregion, comprised of the Atacama and Sechura deserts, forms a continuous strip of desert for almost 3,500 km (1,300 miles) along the coast of Chile and Peru. It features some of the driest areas in the world, some of which receive essentially no rain.
Nevertheless, this ecoregion contains approximately 1300 species of plants of which 60 per cent of Atacama and 40 per cent of Sechura plants are endemic, with only 68 species found in both regions.Local Species
The Atacama-Sechura Deserts ecoregion has distinctive desert plants, particularly ferns, cone-bearing plants, cacti, and flowering plants that survive by absorbing moisture from fog and dew.
Recently discovered rare and endemic plant species include members of the Copiapoa genus, Griselinia carlomunozii, and Tillandsia tragophoba. Guanaco (Lama guanicoe) and Sea lions (Otaria byronia) are some of the characteristic mammals.
Birds include three endemic finches: Slender-billed finch (Xenospingus concolor), Great Inca-finch (Incaspiza pulchra), and Raimondi's yellow-finch (Sicalis raimondi), and the endemic Pied-crested tit-tyrant (Anairetes reguloides).
Threats
Urbanisation, mining, pollution, road construction, livestock grazing, fuelwood collection, commercial plant collection, and erosion constitute the major threats to this ecoregion.
Resources
• NationalGeographic.com
