The earth, known as the blue planet, receives this name due to the oceans that cover 70% of the planet's surface. However, despite the fact that most of our planet is covered by water, we can also find areas of great extension and totally opposite conditions, we are talking about deserts. Do you know which is the oldest and driest desert in the world? Close your eyes and let Ecologist Verde transport you to the Atacama desert with its flora and fauna!
The Atacama Desert is the oldest desert on the planet, with more than 150 million years, and also considered the most arid due to the fact that only an average of 0.5 mm of rainfall per year, existing areas in which periods without rain exceed 300 years.
It's found in the north of Chile, covering the regions of Arica, Parinacota, Tarrapacá, Antofagasta, Atacama and Coquimbo, about 105,000 km² of surface in total. To the north it limits with the port of Arica, to the south, with the city of Copiapó, to the west with the Pacific Ocean and to the east with the Andes mountain range, these last two limitations being key factors in the climatic and meteorological characteristics of the desert. .
The atmospheric pressure of the Pacific gives rise to a stable and dry air mass that prevents the formation of precipitationFurthermore, it produces fogs and clouds that, when they come into contact with the ground, lose their moisture and dry out the environment. Added to this is the effect of the Andes mountain range, which retains the humid winds from the Amazon basin and therefore favors arid and dry conditions.
The presence of vegetation is linked to the climatic conditions of the territory. Although it is true that the climate is mainly characterized by its high temperatures and the absence of precipitationOn the other hand, there are marginal areas, some located at a higher altitude and others south of the Copiapó valley, which present a higher level of humidity.
In the driest areas of the desert, we can find species adapted to these conditions What:
They all present great resistance to dehydration and salinity. In the more humid areas there is greater richness and diversity. In fact, in the Atacama desert, one of the most impressive phenomena in the world takes place, known as “the flowery desert”.
It is related to the El Niño phenomenon, in which the tides heat up producing precipitation and with it, the germination of more than 200 species of flowers, most of them endemic in nature. We will highlight some species:
Some other very representative flowers of the flowering desert are:
Regarding the fauna, as in the case of flora, the presence of one or other species varies depending on the climatic conditions and characteristics of the terrain. In general, there greater variety in arthropods and birds, finding a smaller number of mollusks, reptiles and mammals. Some most characteristic species of the Atacama desert are:
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