Scientific Method —

Jellyfish are the most energy-efficient swimmers, new metric confirms

The coefficient allows comparison of energy efficiency of zebrafish with whales.

Even though a blue whale is much heavier than a tuna, the mammal consumes less energy per unit of weight than the fish when they travel the same distance. For years, these sort of comparisons have dominated our understanding of the energy efficiency of animal movement, which is important for designing vehicles inspired by nature.

But Neelesh Patankar, professor of mechanical engineering at Northwestern University, believes that this measure has only limited benefit. Instead, he and his colleagues have come up with a new measure that allows the comparison of animals as small as bees or zebrafish with animals as large as albatrosses or blue whales.

The new measure has two implications. First, among those species that engage in typical swimming and flying motions, which include most fish and birds, each animal is as energy efficient as it can be. This means that, given their size and shape, each animal is able to spend a minimal amount of energy to move the most distance. Second, this measure confirms a previous finding that jellyfish are unusually energy efficient, beating all the thousands of fish and birds Patankar studied.

“Put another way, a whale and a tuna are equally energy efficient,” Patankar said, noting that this holds for most other animals. “Except jellyfish, which have an unusual action that makes them more efficient.”

A new measure

To understand why jellyfish are special, we need to first understand why we need a new measure for energy efficiency. Patankar offers an analogy: if there are two cars that are of equal weight, would you expect them to have the same mileage? Just as in cars, animals' motion will vary based on factors other than their weight.

John Dabiri, professor of aeronautics and bioengineering at California Institute of Technology, said, “It is not immediately obvious how to compare the swimming efficiency of a bacterium and a blue whale, for example, but Patankar and colleagues have developed one.”

To make the comparison, Patankar borrowed from a well-known concept in physics called the Reynolds number, which explains the relationship between two forces that act on any body that is moving through a fluid. The first is viscous force, which is, crudely put, the push you feel when you put your hand out of a moving vehicle. The second is inertial force, which is the tendency of a moving object to keep moving (or that of a stationary object to remain stationary).

Depending on the size of a body and the speed at which it travels, the body faces either a low Reynolds number, where the forces acting on a body are mostly viscous forces, or a high Reynolds number, where inertial forces dominate. This creates a natural difference in how much energy is spent countering these forces.

The Reynolds number was developed to look at the aerodynamics of stiff bodies, such as aeroplanes and ships. But Patankar theorized that he could use it to help compare animals of different sizes. He gathered data from thousands of birds and fish to come up with a metric called the energy-consumption coefficient, which he has described in the Proceedings of the National Academy of Sciences. Using it, he found that all the animals he looked at (except jellyfish) are as energy efficient as they can be.

Rahul Bale

“The idea that animals are tuned for energy-efficient locomotion is not surprising, but the authors have devised a fresh approach to the issue of how to compare the efficiencies of different animals,” Dabiri said.

Patankar finds that small animals are typically in low-Reynolds-number situations, and large animals find themselves in high-Reynolds-number situations. This means that they expend energies differently, which is what the new coefficient represents. Using the coefficient, researchers can compare the energy efficiency of bodies weighing a few grams to many tons.

The coefficient also indicates that animals that fly are less energy efficient than those that swim. This, Patankar thinks, must be because those in flight have to expend more energy to counteract gravity than those in water.

Jellyfish secrets

While working on the energy-consumption coefficient, Patankar came across recent work with jellyfish showing that the unique contract-and-relax action of jellyfish allows them to recapture some of the energy they spend on motion. This means a jellyfish can travel farther for the same amount of energy spent by other animals (adjusted for weight).

When Patankar used this data and plotted it on his energy-consumption coefficient chart, he found that jellyfish were exceptional. “We found that each swimming or flying animal can spend all the energy it has at its disposal. However, our coefficient is a fair way to conclusively show that indeed jellyfish are more efficient,” Patankar said.

The team behind the jellyfish paper, which includes Caltech's Dabiri, is already working on exploiting the animal's propulsion in mechanical systems. Dabiri thinks that apart from providing a new metric to compare different types of animals on the energy-efficiency scale, Patankar’s measure could be a used for evaluating the performance of aerial and underwater drones that are being developed, especially those with designs that are inspired by flying and swimming animals.The Conversation

PNAS, 2014. DOI: 10.1073/pnas.1310544111  (About DOIs).

First published on The Conversation.

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