Friday, 22 April 2016

Namibia: "fairy circles" mistery solved - scientists


Mistery solved? #FairyCiclesNamibia
Fairy cicles in Namib Desert in Namibia
Scientists claim that the "fairy cicles" in Namibia, which remain one of the major mysteries of biology, are due to self-organization of grass. This hypothesis is proved, based on the same phenomenon discovered in Western Australia. Discovery has been reported in the Proceedings of the National Academy of Sciences magazine.
Fairy cicles in Namib Desert in Namibia
Namibian "fairy cirles" are located about the same distance from each other circles of bare soil surrounded by grass. There are these formations in arid areas of Namibia, and scientists continue to argue about their nature.
Fairy cicles in Namib Desert in Namibia
Stephan Getzin and his colleagues have found a similar three-dimensional structures in one of the parts of Australia - all the circles inherent in the placement of hexagons on a scale of less than 50 meters, as well as uniform distribution in space over large scales. Contrary to the basic theory of the origin of "fairy ring" linking them with the activities of termites, researchers found that in Australia they arise through self-organization.

Fairy cicles in Namib Desert in Namibia
Field studies, remote shooting, mathematical and spatial modeling indicated the positive feedback between the biomass and precipitation. According to scientists, the theory of regular shapes (patterns) in Nature describes the movement of water in arid ecosystems. Precipitation falling on clearing, flow to the surrounding grass and stimulate its growth, which eventually leads to the reproduction of structures. This process does not depend on the species composition of the grass and the soil type.
In Namibia, (as well as in some areas of Angola and South Africa) fairy circles are found in areas with a minimum of variety of species - so that they noticed in Namibia among Stipagrostis genus of plants. Until recently, the most influential hypothesis that explains the origin of the "fairy ring" was considered a thermite. Its proponents argue that termites Psammotermes allocerus trying to thus create favorable environmental conditions for themselves.
YouTube channel: Exploring Namibia
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