Spider is the second being the most sensitive to vibration


30/10/2011

Austrian researchers in the new study confirmed the fact that spiders are extremely sensitive to vibration beings, determining that they are second on the list of living organisms over-sensitive to vibration after cockroaches.

It has long been known that the spiders of all kinds are very susceptible to vibratory stimulation as vibration generated in their web or in the foliage, alerts them to the presence nearby of a potential victim. If vibrations are in a specific frequency range with a certain amplitude, spiders attack the source of vibration. Vibration with non-biological characteristics not cause a reaction of attack of insects.

In a new research study conducted by Clemens Schaber (Clemens F. Schaber) from the University of Vienna, Department of Neuroscience, was used scanning white light interferometer (measuring device, the principle of operation is based on the phenomenon of interference), and were first used to measure the strength of the micro determination output voltage sensors that can trap vibration level and then determine their sensitivity.

Spider, which scholars have chosen to examine the adult female was kind Cupiennius salei. Scientists prefer wandering spider dwelling in Central America, which they brought to the laboratory, due to its large size and the method of hunting is based on the detection of vibrations in the foliage that appears when their victim is somewhere nearby. The wandering spider gets its name from its habit of wandering around at night in the trees, on which he lives, not weaves a web, waiting for it will fall victim. The female spider can reach a leg span of 10 centimeters, with a body length of up to 3.5 centimeters.

A member of the research team Friedrich Barth (Friedrich G. Barth) explained that the spider has more than 3,000 sensors stress on his body, mostly on the legs and vibration receptors located near the foot of the joints. Each voltage sensor initiates the action series of small parallel narrow slits in the complex liroobraznyh senses, which can capture the vibration and movement. When the voltage sensors are beginning to work, cuts are compressed and stimulated.

The researchers found that the decreased sensitivity of the cuts along with their length and that the size of the compression from 1.4 to 30 nanometers caused by vibration and air currents could be identified. The value of the compression caused by the force of 0.01 mikronyutonov.

Spiders can also see the victim in low light conditions and identify odors with hair sensors (pedipalps) located on their antennae.

Analysis results were published in "Royal Society Interface".

Original: Physorg Translation: M. Potter


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