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Diposkan oleh admin on 10:41 AM

Fisherman spider (dolomedes triton) belong mortal talented in the case of do appear job as difficult as walks above water. This spider is genuinely shows mortal miracle by walk above water that they are applied. For that spider, water level within reason dance floor.

Fisherman spider spies on alongside pool edge or river, and moment an insect falls to water level, they run to wade it to overpower their prey. Besides, that spider also can dye their foot downwards water level and catch tadpole and little fish that is swimming.

First matter that must be done animals with life style like that ability stand on above water level. Fisherman spider makes use water level tension. Has larger ones trade-offs style are compared with molecules on the air. This molecule trade-offs power makes water level resembles rubber layer. When does spider put the foot above water, mortar formed pressure formed at around the foot, and water pushes to return to on to flattened to return the surface.

Surface tension not a puissant style: for example, if you throw a stone into water, that stone soon will sink. But, light heavy spider and their foot has layer outside waterproof candle. Besides, they have long foot and this make possible it to stand above water level. Because surface tension averse things above water from the points, long foot means larger ones surface tension. (That’s why a bar of needle not sinks when put according to horizontal in water surface).

Although surface tension makes convergent fisherman spider above water level, but surface tension doesn't make possible it to move to other place. Waxed foot the spider not also suffice it to walk above water level. But water prepares surface enough slippery for spider to move at on it.

Fisherman spider rushes by with row

Fisherman spider uses 3 different movement manners moment rushes by above water. Watchfulness result that done by Robert Suter from Vassar college show that spider rows above water by using mortar that made their foots above water. When move one of [the] the foot up at hind also push the mortar rear with that foot. Moment this mortar moves, that spider foot acts as oar and give energy that push water and the spider forwards. Besides, that spider uses 2 foots middle it from 4 pairs of the foot to row. Foreleg and hind foot is let motion less. A spider use these foots for movement that makes that spider resides in on water level.

Limited fisherman spider speed. To increase speed, a spider makes mortars deeper or pushes those mortars rear faster. Second this manner enlarges pressure in water level, and after this pressure certain limit exceeds surface tension and that mortar is crashed.

Spider species that jump and sail

There second form from the road manner that is done spider. When must they walk with speed exceed 1 meter per second, spider must change to this second manner. They lift their foot up to almost vertical, and then drop it by in such a manner to penetration water. When does spider push their foot downwards and rear, water does reaction contrary to and push that spider to on and forwards. Movement to on prevent spider sinks, and movement forwards make possible it to draw away. This gait is very resembles manner that used lizard basilisk when run above water.

Although this walk is rather difficult for fisherman spider, but that spider do it moment wants to catch prey, when dart, or to release self from enemy. In a state of far more push, that spider changes to third walk: sail…

At moment there wind blows fisherman spider sometimes wave their foots up at wind (spider smaller lifts entire the body)s, causes wind push it to like sailboat. Because be spider body very slippery, atonics impetus can to bring spider from one place to another place.

Special creation in fisherman spider body and various their walk kind only a little example that shows skill created unsurpassed with erudition are greatest from Allah.

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