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Hydrodynamic Propulsion of Water Striders (Image 2)


Freshwater spider runs along the water's surface, leaving vortices behind it

A freshwater spider (Dolomedes) runs along the water's surface, leaving vortices behind its four pairs of stroking legs. In this National Science Foundation-supported project, dye studies were performed in order to determine what the propulsion mechanism is of the water strider (Gerris remigis), a common water-walking insect. [Image 2 of 5 related images. See Image 3.]

More about this Image
Water striders (Gerris remigis) are common water-walking insects approximately 1 centimeter long that resides on the surface of ponds, rivers and the open ocean. In the past, it was believed that water striders developed momentum using the tiny waves they generate as they flap their legs across the water's surface. This was because striders move so quickly that all you see is the waves. But baby water striders legs are not big enough to generate waves, and therefore should be incapable of propelling themselves along the surface. So how are they able to move?

Enter John W.M. Bush, a mathematician from the Massachusetts Institute of Technology (MIT), and his team of researchers who, using high-speed video and blue-dyed water, tracked the movement of water striders. Bush's high-speed images and dye studies show that the water strider propels itself by driving its central pair of legs in a sculling motion. In order for it to move, it must transfer momentum to the underlying fluid. Previously it was assumed that this transfer occured exclusively through capillary waves excited by the leg stroke, but Bush and his team found that, conversely, the strider transfers momentum to the fluid principally through dipolar vortices shed by its driving legs. The strider thus generates thrust by rowing, using its legs as oars, and the menisci beneath its driving legs as blades.

Bush received a grant from NSF's Fluid Dynamics and Hydraulics program (CTS 01-30465) for this project. An NSF Graduate Fellowship award supported David Hu, a graduate student who worked on the project. (Year of image: 2003)

Credit: Courtesy John Bush, MIT

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