Sea strider is one of the few insects living in the marine environment. Scientists are now carefully studying how this animal repels water in order to develop more hydrodynamic hulls. Similar to water striders living in fresh water, sea striders can glide on the water with slender legs. Even if it is beaten by rain and waves, it can stay dry, and it can quickly surface after being submerged.
Researchers at King Abdullah University of Science and Technology (KAUST) in Saudi Arabia collaborated with a scientist in the United States to begin research on how to better understand how this insect throws away liquid in water. To do this, they captured two kinds of sea striders—Halobates germanus inhabiting the open ocean and H. hayanus along the coast—they kept them in aquariums.
Using techniques such as electron microscopy, scientists have discovered that these sea striders are covered with hair of different shapes and sizes. The smallest of these is shaped like a golf club, with its front end tightly packed together, and below it is a shaft with a slightly larger spacing.
This design can prevent water from passing through the front end, causing a layer of air around the insect's body to be trapped. Even if the strider is pushed underwater, the buoyancy of that layer of air will cause them to bounce directly back to the surface. In addition, the researchers also observed that when combing themselves, insects secrete a highly waterproof wax and cover the body.
Inspired by hair and wax, scientists are now working on a hull coating that can make it easier for ships to navigate the water, while also preventing the colonization of towing organisms such as barnacles.
The research was described in a paper recently published in the journal Scientific Report.
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