A surprising variety of insects (including water striders, flies, and also beetles), and also some spiders, are able come “skate” throughout the surface ar of puddles, ponds, and even quiet pools in streams and also rivers. Just how do they perform it? Why execute they execute it? The answer lie in the anatomy of the insects and the distinctive properties the water itself.

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Surface Tension

At the boundary wherein air and water meet, fluid water molecules are an ext strongly attractive to each other than to gas molecule in the air. This phenomenon of attraction exerts an inward pressure that renders it appear as if the surface ar of water is composed of one elastic membrane, if just a thin one. If friend have ever before placed your hand top top the surface of water, you’ve felt this strange property.

Water striders choose this one are a type of true bug.

This is termed “surface tension,” and water has a greater surface stress and anxiety than many liquids thanks to the net of hydrogen bonds strong linking water molecules together.

Sprawling pest Legs

Certain insects like water striders, and spiders, take benefit of the surface anxiety of water. The creatures room light in weight, yet that alone does not describe why they do not sink. Most water-walking insects have very long legs that enable them to spread out their body load over a much greater area than short-legged insects. It is the same principle of physics together snowshoes that spread out your body weight over a better area that snow.

This long-legged fly skates on top of the water.Water Repellent body & Legs

Insects and also spiders have actually their skeletons ~ above the outside of your bodies. This armor is coated in a material called chitin the is waterproof, or at least water-repellent. That keeps lock from becoming dehydrated. It likewise works in reverse and also makes it an overwhelming for insects come drown. Plenty of water-walking insects also have hydrophobic (water-repellent) hairs on their legs and also feet that withstand the attraction of water molecules so castle don’t acquire sucked under.

Water striders have hydrophobic hairs on your legs and feet to help them to walk on water.Why Live on top of the Water?

Most insects that live on height of the water are predators (like water striders) or scavengers. They prosper on non-aquatic insects that loss onto the water and also cannot fly or keen away. The water-walking lifestyle also makes it difficult for their predators to reach them without obtaining stuck in the water.

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This fishing spider is a predator that lives on the surface of the water.Try an Experiment

Try this experiment at house (your budding entomologist will certainly love it!) to see just how solid the surface stress and anxiety of water have the right to be: to fill a cup or glass to the brim v water, climate slowly and also gently slide or reduced a paperclip top top the surface.

Whirligig beetles prefer this one speed randomly over the surface ar of water, often in large “rafts,” looking prefer tiny bumper cars

Spoiler alert: that floats! Well, it is not actually floating: the is gift supported specifically by the surface stress of the water. (True flotation is because of the buoyancy of a large volume of water beneath an object at the surface.)

Ocean-going Water Striders?

Yes, there room some water striders in the genus Halobates that live ~ above the surface ar of the open ocean. They are the just truly marine insects that deserve to exist without call with land. Bon voyage!

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