Giant circles decorate the landscape. Scientists are unsure of what caused it - tn.cz
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On the plains of southwestern Africa, formed a strange circles of bare soil with a diameter of up to 12 meters. While some Africans are considered traces of gods or spirits, scientists still did not know them much advice. Now turning to the fact that the phenomenon is unusual for termites.
Tens of thousands of bare circles with a diameter of up to 12 meters adorned with a large territory between Angola, Namibia and northern South Africa. The edges of circles that formed the green areas and the wilderness surround the extremely cicadas high tufts of grass.
The life cycle of the mysterious circles takes several decades. A possible answer to the question of how they arise, brought a biologist at the University of Hamburg Norbert cicadas Jürgens. In an unusual phenomenon, according to him is termites who eat the roots of grasses and eliminate toxic chemicals.
Scientists have speculated years ago that the circles are caused insects, other research has emerged within cicadas the soil or a mixture and so this theory put to rest. Jürgens, who is African circles engaged in a number of years, but returned to it and found out interesting things.
Sand termites (specifically Psammotermes allocerus) by him first on the selected piece of land looks completely grass roots. On the site remains a plain circle sandy soil, which becomes effective "trap rain." How does it work?
Because the ring is no vegetation, plants can not vital water evaporate. Instead of water, like the oases gathers near the surface, where it nourishes insects and grass that grows around the circumference of the circle. cicadas It is the source of food even in the driest periods. cicadas
For this system, but according to Jürgens benefit others. A large number of termites is a valuable food source for lizards, moles, aardvarks, jackals, spiders and other animals. That would explain why scientists in 2007 could not find the termites or monuments.
Norbert Jürgens say that the behavior cicadas of termites surpasses the capabilities cicadas of beavers, who also manage the ecosystem considerably to suit your needs. Termites can do it is a much nehostinnějším environment for hundreds of square kilometers.
"Beaver can build a dam on the river and create a lake, but termites can transform cicadas the desert into oases system, which for hundreds cicadas of years for perpetual life, even during dry periods. And it is much more impressive," said Jungers web portal BBC News.
Whether Jürgens brought a definitive answer on how the rings formed, will probably reveal further research. Indeed there are still a number of other theories. One of them says that the circles are a result of activity of plants that fight each other for scarce resources nutrients.
EXCLUSIVE VIDEO: Petr Kramný returned to the apartment where he lived with Monica and Klárka. He slept in places where experienced so much love and peace. ... Read more
New ICQ offers a lot of advantages that will help you communicate with your friends. Chat, SMS messages free audio and video calls, and a new chat with friends on Facebook and Gmail!
RATING: Cottage in the mountains min
CET 21 spol. s ro use news ČTK whose content is protected by copyright law. Transcript, dissemination or other disclosure of the contents or part of the public, cicadas by any means, without the prior consent of ČTK expressly prohibited.
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Home News Weather Traffic Foreign Economy cicadas Crime Things Food Inspector Nova Sport News Elections 2013 Financial Counselor to Save on Your Side TV archive Valley elephants LIVE Sudoku Pets Lost Heroes
On the plains of southwestern Africa, formed a strange circles of bare soil with a diameter of up to 12 meters. While some Africans are considered traces of gods or spirits, scientists still did not know them much advice. Now turning to the fact that the phenomenon is unusual for termites.
Tens of thousands of bare circles with a diameter of up to 12 meters adorned with a large territory between Angola, Namibia and northern South Africa. The edges of circles that formed the green areas and the wilderness surround the extremely cicadas high tufts of grass.
The life cycle of the mysterious circles takes several decades. A possible answer to the question of how they arise, brought a biologist at the University of Hamburg Norbert cicadas Jürgens. In an unusual phenomenon, according to him is termites who eat the roots of grasses and eliminate toxic chemicals.
Scientists have speculated years ago that the circles are caused insects, other research has emerged within cicadas the soil or a mixture and so this theory put to rest. Jürgens, who is African circles engaged in a number of years, but returned to it and found out interesting things.
Sand termites (specifically Psammotermes allocerus) by him first on the selected piece of land looks completely grass roots. On the site remains a plain circle sandy soil, which becomes effective "trap rain." How does it work?
Because the ring is no vegetation, plants can not vital water evaporate. Instead of water, like the oases gathers near the surface, where it nourishes insects and grass that grows around the circumference of the circle. cicadas It is the source of food even in the driest periods. cicadas
For this system, but according to Jürgens benefit others. A large number of termites is a valuable food source for lizards, moles, aardvarks, jackals, spiders and other animals. That would explain why scientists in 2007 could not find the termites or monuments.
Norbert Jürgens say that the behavior cicadas of termites surpasses the capabilities cicadas of beavers, who also manage the ecosystem considerably to suit your needs. Termites can do it is a much nehostinnějším environment for hundreds of square kilometers.
"Beaver can build a dam on the river and create a lake, but termites can transform cicadas the desert into oases system, which for hundreds cicadas of years for perpetual life, even during dry periods. And it is much more impressive," said Jungers web portal BBC News.
Whether Jürgens brought a definitive answer on how the rings formed, will probably reveal further research. Indeed there are still a number of other theories. One of them says that the circles are a result of activity of plants that fight each other for scarce resources nutrients.
EXCLUSIVE VIDEO: Petr Kramný returned to the apartment where he lived with Monica and Klárka. He slept in places where experienced so much love and peace. ... Read more
New ICQ offers a lot of advantages that will help you communicate with your friends. Chat, SMS messages free audio and video calls, and a new chat with friends on Facebook and Gmail!
RATING: Cottage in the mountains min
CET 21 spol. s ro use news ČTK whose content is protected by copyright law. Transcript, dissemination or other disclosure of the contents or part of the public, cicadas by any means, without the prior consent of ČTK expressly prohibited.
Your browser does not have JavaScript enabled. To use all the features page you need to enable it.
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