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FLORA AND FAUNA
New Rwandan praying mantis species hunts like a tiger
by Brooks Hays
Cleveland (UPI) May 21, 2013


Namibian 'fairy circles' aren't made by termites, scientists say
Namib Desert, Namibia (UPI) May 21, 2013 - So-called fairy circles are barren patches of dirt, usually surrounded by a dense ring of vegetation. The rings, which are found in the arid grasslands of Namibia, can grow as wide as 65 feet and last for more than 75 years.

For nearly as long, they've been mystifying scientists. Many theories for the circles' existence have been offered: termite eating patterns, carnivorous ants, plant-killing hydrocarbons and more.

Now a new study, utilizing aerial photos, rules out the possibility of termites as fairy circle creators. According to the researchers at the Helmholtz Centre for Environmental Research (UFZ) in Leipzig, Germany, "for the first time they have carried out a detailed analysis of the spatial distribution of these fairy circles."

The rings themselves aren't just geometrically impressive, but their relationship to each other also seems to follow a distinct spatial structure. The researchers say the pattern is too expansive to be the work of a typically erratic and frenzied species such as the termite -- let alone any insect.

"The occurrence of such patterning in nature is rather unusual," said study researcher Stephan Getzin. "There must be particularly strong regulating forces at work."

"There is, up to now, not one single piece of evidence demonstrating that social insects are capable of creating homogeneously distributed structures on such a large scale," Getzin added.

The German researchers say the most likely explanation is resource-competition, the quest for water on the edge of an arid ecosystem -- where grasslands transition to desert. As vegetation matures, and water resources are taxed, growth may thin out in a self-governing fashion, much the way young forests mature from dense brush to larger and more scattered trees.

"We consider this at present being the most convincing explanation," Getzin concluded.

The study was published this week in the journal Ecography.

"Vicious" is how some news outlets are describing a new species of praying mantis discovered in the African nation of Rwanda. It sounds like an overstatement, but for the small insects scurrying about the rainforest floor, the fear is probably very real.

Dystacta tigrifrutex, or the "bush tiger mantis," was discovered in Nyungwe Forest National Park in the southwest corner of Rwanda.

"The new species is amazing because the fairly small female prowls through the underbrush searching for prey while the male flies and appears to live higher in the vegetation," explained researcher Riley Tedrow, who is studying evolutionary biology at Case Western Reserve University.

It's apparently not a man's world in the jungle underbrush of Rwanda, as the wingless females seem to be the main bread-winners.

"The new praying mantis species was found in the high altitude rain forest region of southwestern Rwanda and probably only lives within Nyungwe National Park, which adds significant justification for protecting the park to ensure species like this can continue to exist," said Dr. Gavin Svenson, who accompanied Tedrow on the three-week survey of wildlife in the Rwandan national park.

Svenson is the curator of invertebrate zoology at the Cleveland Museum of Natural History and a professor at Case Western Reserve University.

Tedrow and Svenson's survey was assisted by Kabanguka Nathan and Nasasira Richard from the Kitabi College of Conservation and Environmental Management in Rwanda. While the survey only lasted three weeks, it took several months to identify all the specimens they collected.

The bush tiger mantis is the only newly discovered species found during the expedition. The researchers confirmed the mantis' uniqueness by comparing it to similar species from other museum collections.

The mantis' entrance into the official biological record books is detailed in the latest issue of ZooKeys.

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