Two 'noses' are necessary for flies to navigate well

Dec 26, 2007

Animals and insects communicate through an invisible world of scents. By exploiting infrared technology, researchers at Rockefeller University just made that world visible. With the ability to see smells, these scientists now show that when fly larvae detect smells with both olfactory organs they find their way toward a scented target more accurately than when they detect them with one.

“Having two eyes allows us to have depth perception and two ears allows us to pinpoint a noise precisely,” says Leslie Vosshall, head of the Laboratory of Neurogenetics and Behavior. “Sensing odors in stereo is equally important.”

In research to be published in the December 23 online issue of Nature Neuroscience, Vosshall and her colleagues show that odor information is easier to perceive when it is smelled with both olfactory organs. By genetically manipulating flies to express odorant receptors in one olfactory organ or both, they show that the brains of Drosophila melanogaster larvae not only make use of stereo cues to locate odors but also to navigate toward them — a behavior called chemotaxis.

To study this behavior, Vosshall and her colleagues had to figure out which direction the larvae move with respect to the source of the odor. But since odors are invisible, the researchers could neither predict how the flies would move in relation to these scents nor guess whether the odors were concentrated in patches or along a gradient. To complicate matters, odors whisk to and fro at the mercy of the slightest stir, making it impossible to determine their concentrations at particular locations.

“We needed to create an environment in which we knew something about the spatial arrangement of the odors,” says Vosshall. “We needed to see the smells.”

In collaboration with colleagues in Thomas P. Sakmar’s Laboratory of Molecular Biology and Biochemistry, the researchers used a novel spectroscopic technique that exploited infrared light to create environments where they could see, control and precisely quantify the distribution of these smells.

When Vosshall and her colleagues observed the animals’ behavior, they found that although animals with one functional nose or two were both able to sense odors, only the ones with both olfactory organs working accurately navigated toward the odor source. “A left-right comparison isn’t necessary for flies to smell,” says Vosshall, “but it is necessary for them to do it well.”

Source: Rockefeller University

Explore further: 'Office life' of bacteria may be their weak spot

add to favorites email to friend print save as pdf

Related Stories

Mutant mosquitoes lose their appetite for humans

Jun 10, 2013

(Phys.org) —What draws a mosquito to bite its host has long been studied from the perspective of the victim—uncovering which smells and chemicals lure the insect in. But researchers at Rockefeller's Laboratory ...

Insects evolved radically different strategy to smell

Apr 13, 2008

Darwin's tree of life represents the path and estimates the time evolution took to get to the current diversity of life. Now, new findings suggest that this tree, an icon of evolution, may need to be redrawn.

New method enables scientists to see smells

Dec 24, 2007

Animals and insects communicate through an invisible world of scents. By exploiting infrared technology, researchers at Rockefeller University just made that world visible. With the ability to see smells, these scientists ...

Recommended for you

Transparent larvae hide opaque eyes behind reflections

2 hours ago

Becoming invisible is probably the ultimate form of camouflage: you don't just blend in, the background shows through you. And this strategy is not as uncommon as you might think. Kathryn Feller, from the University of Maryland ...

Peacock's train is not such a drag

4 hours ago

The magnificent plumage of the peacock may not be quite the sacrifice to love that it appears to be, University of Leeds researchers have discovered.

Iberian pig genome remains unchanged after five centuries

9 hours ago

A team of Spanish researchers have obtained the first partial genome sequence of an ancient pig. Extracted from a sixteenth century pig found at the site of the Montsoriu Castle in Girona, the data obtained indicates that ...

User comments : 0