New theory may explain mystery of Fairy Circles of Namibia
LONDON: Fairy Circles of Namibia, one of the nature’s greatest mysteries, could have been formed by the mutual interaction between termites and vegetation, researchers have found.
Fairy Circles of Namibia are circular patches of land barren of plants, varying between 2 and 15 metres in diameter, often encircled by a ring of stimulated growth of grass.
The cause of the circular patches of earth surrounded by grass, which are arranged in honeycomb-like patterns in huge areas of the Namib desert, has been the source of scientific debate for decades.
The new research, published by researchers at the University of Strathclyde and Princeton University in scientific journal Nature, suggests that the interaction between termite engineering and the self-organisation of vegetation could be jointly responsible for the phenomenon. Regular vegetation patterns form spectacular landscapes across the globe, with the Fairy Circles in Namibia holding special interest for scientists since the 1970s. Some have argued that termites alone create these patterns by destroying vegetation to reduce competition for water, while others have suggested the circles follow patterns of rainfall and are solely caused by competition between plants. According to a statement by the University of Strathclyde, the newly-published findings show that ‘Fairy Circles’ may actually result from the close interaction between both termites and vegetation, which facilitates their mutual survival. Juan Bonachela from the University of Strathclyde’s Department of Mathematics and Statistics, said: “There have long been two theories on how these regular patterns, and especially Fairy Circles, are formed, and both theories are normally presented as mutually exclusive”.
“Our findings harmonise both theories and find a possible explanation for regular vegetation patterns observed around the globe. In the case of Fairy Circles, termites remove vegetation on their mounds to increase moisture, which is essential for the insects’ survival in dry environments, thus creating the bare disk,” it said.