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Namibia's 'fairy circles': Nature's greatest mystery?

By Daisy Carrington, for CNN
June 13, 2014



(CNN) -- From the air, the Namibian desert looks like it has a bad case of chicken pox. Spread across 1,100 miles of a narrow strip sit a smattering of barren polka dots, otherwise known as fairy circles. These sizable craters measure 10- to 65-feet in diameter, and represent one of nature's greatest mysteries.

Over the decades, a number of theories, from alien invasion to poisonous gasses have been put forth to explain the phenomenon. Last year, a study published in the journal Science made headlines by claiming sand termites were the culprit. None of these, however, have been fully proven.

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"If you go to Wikipedia and type in 'tiger bush', you'll find aerial images of a county in Niger where the vegetation forms in striped patterns. In Australia, you have [areas with grass circles known as] spinifex grass," he notes.



"A few days ago, a professor in California sent me an example of ring-like patterns formed in the Mojave Desert."

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Debunking the termite

The self-organization theory comes about a year after biology professor Norbert Juergens argued in a paper published in Science that fairy circles were the work of a species of sand termite, psammotermes allocerus. Juergens' argument went that they created an underground oasis for themselves by eating the grass roots and killing them, thereby causing a subterranean water trap (without vegetation, water doesn't evaporate and remains underground). Getzin finds the explanation unlikely.



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"Whereas all insect studies showed large-scale clumping of nest locations, self-organization in itself can cause homogenous spacing at those scales and even beyond to several kilometers."



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"There is a high correlation between fairy circles and these termites, and therefore Juergens claimed that they're the cause. But it's just a correlation, and one of the most fundamental mistakes a scientist can make is to confuse correlation with causation," says Walter Tschinkel, a biology professor at Florida State University who specializes in both social insect behavior and fairy circles.



"The termite theory is very appealing to people, because it's relatively easy to understand, whereas self-organization requires some knowledge or intuition for how plants work," he adds.

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There are similar examples in nature that are likely a result of self-organization. These include Niger's tiger bushes and spinifex grass in Australia.

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