{"id":104066,"date":"2018-12-07T00:15:32","date_gmt":"2018-12-07T00:15:32","guid":{"rendered":"https:\/\/www.bnreport.com\/heres-how-geckos-almost-walk-on-water\/"},"modified":"2018-12-07T00:15:32","modified_gmt":"2018-12-07T00:15:32","slug":"heres-how-geckos-almost-walk-on-water","status":"publish","type":"post","link":"https:\/\/www.bnreport.com\/en\/heres-how-geckos-almost-walk-on-water\/","title":{"rendered":"Heres how geckos (almost) walk on water"},"content":{"rendered":"

Add water aerobics to the list of the agile geckos athletic accomplishments.<\/p>\n

In addition to sticking to smooth walls and swinging from leaves, geckos can skitter along the surface of water. By slapping the water with all four limbs to create air bubbles and exploiting the surface tension of water, the reptiles can travel at speeds close to what they can achieve on land<\/a>, according to a new analysis of high-speed video footage described December 6 in Current Biology<\/em>.<\/p>\n

In the world of water walkers, geckos occupy an awkward intermediate turf, says study coauthor Jasmine Nirody, a biophysicist at Rockefeller University in New York City and Oxford University. Small insects like water striders use surface tension, created by water molecules sticking together, to stay afloat. Bigger animals like basilisk lizards slap the surface of the water, creating air pockets around their feet that reduce drag and keep the lizards mostly above the waters surface. But an animal needs to be fairly large to generate enough force to hold itself out of the water using that strategy.<\/p>\n

\u201cGeckos fall smack-dab in the middle\u201d size-wise, Nirody says. \u201cThey shouldn't really be able to do this at all.\u201d And yet, when her colleague Ardian Jusufi of the Max Planck Institute for Intelligent Systems in Stuttgart, Germany, was vacationing in Singapore, he noticed small geckos skittering across the surface of puddles.<\/p>\n

Back in the lab, the team filmed eight flat-tailed house geckos (Hemidactylus platyurus<\/em>) crossing a tank of water, then slowed the footage to get a closer look at the action.<\/p>\n

All four limbs slap the water in a sort of inelegant, extra-splashy front crawl stroke, while the undulating tail adds forward propulsion, the researchers found. While geckos back legs remain submerged, the front 70 percent of their body is out of the water. Since water is harder to move through than air, that positioning helps the geckos travel through the water at about 10.5 body lengths, or up to nearly a meter, per second. Its almost as fast as they move on land, and far faster than expected if swimming fully submerged.<\/p>\n

\u201cThe thing that's kind of spectacular about these animals is that they do look like they're front crawling across the water,\u201d says Tonia Hsieh, a biomechanics researcher at Temple University in Philadelphia who has studied the slapping behavior of basilisk lizards.<\/p>\n

Despite paddling with four limbs instead of two like basilisk lizards, the geckos couldnt generate nearly as much force. Its enough to support only about 30 percent of their weight, Nirody calculated. And when she added dish soap to the water to lower surface tension, the geckos couldnt move nearly as fast. That suggests that while surface tension alone cant support geckos like it can a tiny insect, it still gives them an extra boost. Superhydrophobic skin that repels water helps too, further reducing drag.<\/p>\n

Geckos may not truly walk on water in the way, say, that water striders do, Nirody admits. \u201cThey're doing sort of a mixed-mode movement, combining techniques used in walking and swimming.\u201d Someday, she hopes, the geckos hybrid approach might help researchers create robots that can travel more efficiently through water.<\/p>\n

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science news<\/a><\/h5>\n

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\n[contfnewc]<\/p>\n","protected":false},"excerpt":{"rendered":"

Add water aerobics to the list of the agile geckos athletic accomplishments.<\/p>\n

In addition to stickin..<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[],"class_list":["post-104066","post","type-post","status-publish","format-standard","hentry","category-science"],"yoast_head":"\nHeres how geckos (almost) walk on water - Business News Report<\/title>\n<meta name=\"description\" content=\"Add water aerobics to the list of the agile geckos athletic accomplishments. 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