Scientists observe wind-powered wheel locomotion in tiger beetle larvae (w/ video)

Mar 28, 2011
Northeastern beach tiger beetle
Northeastern beach tiger beetle. Image credit: Encyclopedia of Life

(PhysOrg.com) -- Research conducted by Georgia Southern University associate professor of biology Alan Harvey, Ph.D. along with former Georgia Southern University biology graduate student Sarah Zukoff will be published in PLoS ONE, an international, peer-reviewed, open-access, online publication. Harvey and Zukoff recently documented the first case of wind-powered wheel locomotion in larvae of "one of the best-studied insects in North America," the Eastern Beach Tiger Beetle Cicindela dorsalis (subspecies media).

The discovery is unique as wheel , in which an animal distorts the shape of its body to form a rolling wheel, has only been reported for a few species worldwide, all of which use either gravity or their own exertions to power the wheel.

This video is not supported by your browser at this time.

“That we could find such an astounding suite of behaviors in such a well-studied animal is very rare,” said Harvey. “These discoveries might help explain how human impacts are causing populations of this species, and perhaps others, to decline. This project also demonstrates the value of continued basic research on organisms if we want to conserve biodiversity.”

The Georgia Southern research team found that the Eastern Beach Tiger Beetle’s wheeling is initiated through spectacular leaping somersaults. At the team’s research site along the coast of Georgia, all wheeled uphill due to the consistent sea breeze. Stronger winds and untrampled sands increased the proportion of larvae that wheeled, as well as both wheeling distance and speed. In some cases, larvae wheeled more than 60 meters at an estimated speed of three meters per second, the fastest ever recorded for an insect on the ground.

Harvey also notes that jumping is challenging for elongate, soft-bodied animals with short or no legs like beetle larvae. “Leaping is known for only a few animals with this ‘worm-like’ morphology. At first we thought our larvae were just wildly thrashing around until they happened to catch the breeze. But our slow-motion videos showed that they were actually making carefully timed leaps that became these beautiful aerial somersaults, which seemed to let them orient to the breeze and then ‘hit the ground rolling.’ We almost couldn’t believe our eyes.”

The two researchers suspect that the wheeling behaviors are escape responses to a type of parasitoid wasp that specializes in tiger beetle larvae around the world, which will be the focus of their next phase of research. In recent years, many species of coastal tiger beetles have suffered precipitous declines that are clearly correlated with increased human impacts such as pedestrian or vehicular traffic, although the exact reasons have been unclear. The team’s current research suggests that the negative effects of foot traffic may be indirect, preventing larvae from escaping from predators by disrupting the flat, hard surface necessary for efficient wheeling.

Explore further: Keep dogs and cats safe during winter

More information: Harvey A, Zukoff S (2011) Wind-Powered Wheel Locomotion, Initiated by Leaping Somersaults, in Larvae of the Southeastern Beach Tiger Beetle (Cicindela dorsalis media). PLoS ONE 6(3): e17746. doi:10.1371/journal.pone.0017746

Provided by Georgia Southern University

3.8 /5 (4 votes)

Related Stories

Flies' evasive move traced to sensory neurons

Nov 29, 2007

When fruit fly larvae are poked or prodded, they fold themselves up and corkscrew their bodies around, a behavior that appears to be the young insects’ equivalent of a “judo move,” say researchers reporting online on ...

Beetle explorers name new species for Roosevelt

Mar 22, 2011

(PhysOrg.com) -- A new species of a rugged darkling beetle that thrives in an arid region of the Chihuahuan Desert is being named in honor of Theodore Roosevelt on the 100th anniversary of a speech he gave ...

Researchers gain focus on a bug with bifocals (w/ Video)

Aug 23, 2010

(PhysOrg.com) -- University of Cincinnati researchers are reporting on the discovery of a bug with bifocals - such an amazing finding that it initially had the researchers questioning whether they could believe ...

Host change alters toxic cocktail

Mar 11, 2011

(PhysOrg.com) -- Leaf beetles fascinate us because of their amazing variety of shapes and rich colouring. Their larvae, however, are dangerous plant pests. Larvae of the leaf beetle Chrysomela lapponica attack ...

Recommended for you

Keep dogs and cats safe during winter

Dec 27, 2014

(HealthDay)—Winter can be tough on dogs and cats, but there are a number of safe and effective ways you can help them get through the cold season, an expert says.

Scientists target mess from Christmas tree needles

Dec 26, 2014

The presents are unwrapped. The children's shrieks of delight are just a memory. Now it's time for another Yuletide tradition: cleaning up the needles that are falling off your Christmas tree.

The ants that conquered the world

Dec 24, 2014

About one tenth of the world's ants are close relatives; they all belong to just one genus out of 323, called Pheidole. "If you go into any tropical forest and take a stroll, you will step on one of these ...

User comments : 0

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.