Silk thread tarantulas are at his feet


18/05/2011

Climbing is probably one of the riskiest things an adult tarantula. With its weight of around 50mg connection system that provide support and stable retention of sophisticated spiders are not entirely successful in these colossal arachnids. "These insects are very delicate. They can not survive a fall from any height" - Claire Rind (Claire Rind) from the University of Nyukestla in the UK.

In 2006, Stanislav Gorb (Stanislav Gorb) and his colleagues published an analysis in the journal "Nature", pushing the version that tarantulas are able to survive in the event of a releasing silk threads from their feet. However, this was quickly refuted by another research group, which could not find any confirmation of the presence of spider silk in the legs. Carried away by the life of spiders and intrigued by the scientific debate, Rind decided to challenge, explore and discover that tarantulas produce silk from their feet when they lose by a prop. She published her findings in the journal "Experimental Biology".

By organizing the study in collaboration with graduate student Luke Burkett, Rind observe how Chilean tarantulas that live on earth, able to resist being on a vertical surface. By placing one of the animals in a very clean aquarium with microscope slides on the floor, the researchers carefully turned the aquarium to see if the tarantula is in limbo.

"In the experiment, we have refuted earlier statements that tarantulas can not hold onto a vertical surface," - said Rhind. Since being in this position, the spider did not fall, the researchers gently rocked the aquarium. Tarantula slightly staggered and moved, but continued to hold on to. As for the silk yarns with the naked eye, the researchers do not see the glass, and only under the microscope it could discern fine silk thread to the microscope slide where the spider staggered during agitation tank.

Then, after spending a number of experiments, Rind failed to prove that stands out from the silk of spiders legs and spinning out of the network. They also found that spiders produce their thread safety during sliding. But what of the legs could stand Wide Web? Gathering all faded exoskeletons of spider species, as the Mexican krasnokolenny spider tarantula and furry tarantula, Rind examined them under a microscope and saw the thin threads of silk, protruding from microscopic hairs on the legs Furry tarantula.

Then the researchers in a more intimate permission considered fluffy, Chilean tarantula, and Indian ornamental tarantulas with an electron microscope and discovered the "cocks" that were beyond the microscopic attachment hairs and were widely distributed throughout the surface of the foot.

Rind also studied tarantula family tree and found that all three species of insects were distant relatives, so probably all tarantula feet produce all kinds of vital silk threads. Finally, drawing attention to the distribution of "taps," Rind realized that tarantulas can be a kind of missing link between the first spiders spinning webs and modern spinners.

She explains that the location of glands on the leg tarantula is similar to the arrangement of silk glands on the abdomen of the first extinct species of spider Attercopus, which lived 386 million years ago. "Stopcock" modern tarantula is also more similar to the mechanically-sensory hairs that are located throughout the body of the spider, possibly being an evolutionary gap in the development of spinning webs.

Original: Physorg Translation: M. Potter


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