Natures wonders: spiders balloon and sail! (Introduction)

by David Turell @, Saturday, July 04, 2015, 21:35 (1510 days ago) @ David Turell

This is the way they can travel long distances, using silk as a sail and silk as an anchor:

http://www.sciencedaily.com/releases/2015/07/150703072620.htm

"Spiders travel across water like ships, using their legs as sails and their silk as an anchor, according to research published in the open access journal BMC Evolutionary Biology. The study helps explain how spiders are able to migrate across vast distances and why they are quick to colonise new areas.


"Common spiders are frequently observed to fly using a technique called 'ballooning'. This involves using their silk to catch the wind which then lifts them up into the air. Ballooning spiders are estimated to move up to 30 km per day when wind conditions are suitable, helping in their quest for new habitats and resources.

***

"Many of the spider species adopted elaborate postures, such as lifting up a pair of legs, to seemingly take advantage of the wind current whilst on the water surface. This allowed them to 'sail' in turbulent, still, fresh, and salt water conditions.

"By releasing silk on water, the sailing spiders also seemed to act like ships dropping their anchors to slow down or stop their movement. This suggests that the silk may sometimes work as a dragline for the water-trapped spider to attach to floating objects or to the shore. These behavioral adaptations could allow spiders to survive encounters with aquatic environments.

"The research team also found that the spiders that adopted 'ballooning' behavior for airborne dispersal were also the most eager and able 'sailors'. The association between the two behaviors may indicate the importance of ballooners also being able to sail, which could be invaluable when landing on water."


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