Why can water spiders walk on water

The hairs on the tarsal joints of water spiders allow them to move very quickly on the surface of the water with the help of surface tension without sinking.

Water spiders have 3 pairs of legs, the forefoot is short, the middle and hind feet are very long, stretching out in all directions, and the hind leg segments extend more than the end of the abdomen. The forefoot is noticeably shorter. The tarsal segment is 2 segments, the end of the terminal segment is lobed into 2 lobes, and a pair of claws are born at the base of the fissure.

The back pair of legs can be used to control the direction of the slide, and the middle pair of legs are the driving legs, which are particularly long. The front pair of legs is shorter and is only used for hunting. The hairs on the tarsal joints allow them to move very quickly on the surface of the water with the help of surface tension without sinking.

Antennae 4-segmented, distinctly extended. The beak is 4-segmented, stout, straight, but not close to the ventral surface of the head. The dorsal plate of the anterior thorax is extremely well developed and extends backwards, completely covering the dorsal plate of the midthorax and making it invisible from the outside.

This is especially true in the wingless type. There is no collar at the front end of the dorsal plate of the chest. The mesothoracic small shield is underdeveloped.

Water spiders feed on insects that fall from the water, they can slide on the surface of the water at a speed of about meters and seconds, and they can even jump on the surface of the water, each jumping a distance of about 30cm to 40cm. A detailed investigation of water spiders revealed that there are 1,700 different species of water striders around the world, and they are very widely distributed, almost all over lakes, streams, urban ponds, etc., in the northern hemisphere, and are a very successful insect.

The tarsal fur of spiders allows them to move quickly on the surface of the water without being affected by surface tension.

And sinking. Diving bell spider.

There are three pairs of feet, the front foot is short, the middle hind foot is long, and the back leg extends in all directions, and the hind leg extends how far to the end of the abdomen. The front foot is noticeably shorter. Tarsus.

Segment 2, the terminal lobe is divided into 2 leaves, and there is a pair of claws at the base of the lobe. The hind leg can be used to control the direction of the slide, while the middle leg is the driven leg, which is particularly long. The front legs are relatively short and are used only for hunting.

The hairs on the tarsal allow them to move quickly on the surface of the water without sinking with the help of surface tension.

Antennae 4, significantly lengthened. Beak 4, stout, straight, but not close to the ventral surface of the head. The anterior thorax and back are well developed and extend posteriorly, completely covering the mid-thorax and back, and the outer ** is not visible.

This applies especially to the wingless type. There is no collar on the front and back chest. The mid-thorax and small shield are underdeveloped.

The reason why the water spider can walk on water has a lot to do with its body structure, the water spider is covered with a lot of fine fluff all over the body, which can play a role in waterproofing. And there are some small blisters on the surface of these appearances, and the feet of the water spiders are very slender, so the surface area is very large when they are on the water, and the tension of the water is also very large, so the water spiders can float on the surface of the water as a whole.

The structure of the water spider is actually the main reason why the water spider can be on the water is its fluff, the fluff of the water spider is very developed, and the fluff itself is waterproof, there are many small bubbles that can isolate the water spider from the water, so although the water spider acts on the water surface, it itself is equivalent to being isolated from the water surface, so the water spider can run rampant on the water surface.

And the water spider can also spin silk on some aquatic plants, such as on some aquatic plants and seaweed, you can spin silk webs, and then rely on spider webs to collect some small bubbles, then the spider web has become a large balloon, you can protect the water spider, the water spider can lay eggs on it, and these small bubbles can also supply oxygen to the water spider.

The habits of water spiders These small blisters are very important for water spiders, because the oxygen supply of water spiders depends on small blisters, and when water spiders breathe, the oxygen content of these small blisters will decrease, and when the oxygen amount is too low, the oxygen in these bubbles will be automatically replenished, so even if the water spiders remain stationary, there is no need to worry about suffocation due to lack of oxygen, because these bubbles will constantly replenish oxygen.

However, if the oxygen is insufficient, the water spider will come to the surface, so the water spider cannot survive under the water surface for a long time, and often has to surface to breathe. The way water spiders breathe gave scientists some inspiration to create physical lungs that divers need to carry if they want to dive to the bottom of the sea.

Water has surface tension, and those water spiders that can walk on water should have a lot of bristles on their legs, which can increase the surface area of rainwater, resulting in a lot of water tension, so that they can walk on the water instead of floating on the water ......own understanding.

Water spiders are good at spinning silk and forming webs between aquatic plants. Because of the storage of bubbles under the web, the original webs are in the shape of a bell, like a small caisson, and they are encamped in the caissons, in which the female lays eggs and hatches. The bubble swarm that the water spider has is not only an oxygen reservoir, but also an oxygen concentrator – constantly drawing oxygen from the surrounding water.

This is what people call the "physical lungs" oxygen delivery device. The oxygen concentration in the bubble gradually decreases during the breathing process of the water spider, and once the oxygen content is below 16%, the oxygen dissolved in the water will replenish itself into the bubble. Usually when the spider is at rest, the physical lungs are sufficient to ensure oxygen supply; When the oxygen consumption is too high, the supply of oxygen-containing bubbles in the water will exceed the demand, and the proportion of other gases in the bubbles will rise until it greatly exceeds the proportion in the air.

As a result, the nitrogen begins to diffuse into the water, and the volume of the bubbles decreases accordingly (as the oxygen is depleted), and eventually, the spider has to reappear on the water and re-oxygenate the oxygen reservoir.

Through this understanding of water spiders, I realized that the knowledge of nature is boundless, and as long as you are serious, you can explore the mysteries of nature.

Oh! It turns out that this is a spider that is not afraid of water, it lives on the surface of the water, its feet are covered with suction cups, and its body is very light, so it can come and go freely on the water. If we walk on water, we will sink.

The water spider is different from us, when it walks on water, it is as smooth as walking on land.

Just like an embroidery needle lying flat on water, the water has a certain surface tension, and the water spider has countless fine hairs on its legs, and the fine hairs help it float on the water.

Only some spiders are water-afraid, and the surface of the spider's body is covered with dense fine hairs instead of oil, and the size of the spider varies from 3 mm to 9 cm. In the animal kingdom it belongs to the phylum Arthropods.

Arachnids. There are many species of spiders, and there are more than 35,000 species of spiders in nature. These spiders can be broadly divided into three types: hunting spiders, web-building spiders and cave spiders.

The first group will forage for food, and the second group will set up nets and wait for the rabbits. And most of the people who keep them as pets are in the third category: cave spiders.

They like to hide in sand piles or burrows, and build nets at the mouth of the holes, which are not sticky and are purely used to sense the size of their prey and prey on them. But there are also aquatic spiders, which live underwater by weaving webs to form air pockets.

Another point is that most house spiders cannot survive in the water, and the spiders you see should be the common tarantulas in the home. Finish.

Because the body structure of the water spider is abnormal. He has a kind of fluff all over his body. In addition, there is tension on the surface of the water, so it can walk on water.

Because water spiders have a lot of hair on their feet and are water-repellent, they can walk on water.

Water has surface tension, and the water spider is covered with waterproof fluff all over the body, and many bubbles are attached, which can increase the surface area of rainwater, resulting in a great tension of water, so that you can walk on the water instead of floating on the water.

Because of the spider's small size and the small contact area of its feet, spiders can easily walk on water.

It is not spiders that walk on the surface of the water, this creature is called water strider, also known as water horse insect, which is an aquatic hemipteran insect, Hemiptera, water strider. Water striders live on the surface of the water all their lives, and with the help of adaptive traits such as water-repellent hairs and outstretched limbs under the body, they do not sink or get wet. On the water.

Paddle mainly relies on the movement of the middle and hind feet, and the forefoot is raised when moving, not to paddle, and is mainly used to catch prey.

The real water spider, also known as the silver spider, can dive into the water, but not walk on the surface of the water, when the water spider dives into the water, the whole body is covered with waterproof fluff will attach many bubbles, as if entering a closed sleeve of air layer.

Their body is covered with hairs, which increase the surface area between their body and the surface of the water.

Yes, water spiders use surface tension to move quickly through the surface of water.

Surface tension is the elastic action of the surface of the liquid, so that the surface of the liquid has an inward force, whether it is put into the liquid or collapsed to call the liquid away, it has to overcome this inward force.

The water spider uses this surface tension to separate its legs, and then quickly merges its legs to form a special movement form that allows it to quickly shuttle across the water.

This type of walking is also known as crawling like a bend.

In addition, in addition to water spiders that use surface tension, conch shells also use surface tension to walk quickly.

In addition, surface tension can be used not only for walking, it can also be used to irrigate or move objects, and if there is enough force, it can also be used to separate liquids.