Desert ants smell their way home

Feb 27, 2009
Cataglyphis fortis

Humans lost in the desert are well known for going around in circles, prompting scientists to ask how desert creatures find their way around without landmarks for guidance. Now research published in BioMed Central's open access journal Frontiers in Zoology shows that Desert Ants input both local smells and visual cues into their navigation systems to guide them home.

Until now researchers thought that the Desert Ant Cataglyphis fortis, which makes its home in the inhospitable salt pans of Tunisia, was a pure vision-guided insect. But Kathrin Steck, Bill Hansson and Markus Knaden from the Max Planck Institute for Chemical Ecology in Jena, Germany used gas chromatography to verify that desert microhabitats do have unique odour signatures that can guide the ants back to the nest.

After having identified some odours of these signatures the researchers trained ants in field experiments to recognise these odours pointing to a hidden nest entrance. Ants learned to associate their nest entrance with a single odour and discriminated the training odour against non-training odours. They even picked out the training odour from a four-odour blend. The ants were less focused when faced with a blend rather than the pure scent of home, but still performed better in their search than those tested with the solvent control.

The use of environmentally derived olfactory landmarks has been shown for pigeons, while most ants rely rather on self generated pheromone trails. However Cataglyphis roams for over 100 meters in search for food in a habitat where high temperatures and changeable food locations make pheromone trails ineffective. This might be the reason, why these ants better go for stable olfactory landmarks that they learn at the nest entrance.

"We are amazed to discover that while keeping track of the path integrator and learning visual landmarks, these ants can also collect information about the olfactory world," said Knaden, who hopes to investigate the interaction between visual and olfactory information in future research.

More information: Smells like home: Desert ants, Cataglyphis fortis, use olfactory landmarks to pinpoint the nest
Kathrin Steck, Bill S Hansson and Markus Knaden, Frontiers in Zoology (in press), www.frontiersinzoology.com/

Source: BioMed Central

Explore further: Chimps with higher-ranking moms do better in fights

add to favorites email to friend print save as pdf

Related Stories

Drought sees Rio's main hydro plant turned off

5 hours ago

A major Rio hydroelectric power plant was switched off after water levels slipped below an operational minimum following severe drought, Brazil's national grid told AFP on Thursday.

Recommended for you

Chimps with higher-ranking moms do better in fights

12 hours ago

For chimpanzees, just like humans, teasing, taunting and bullying are familiar parts of playground politics. An analysis of 12 years of observations of playground fights between young chimpanzees in East ...

Blind beetles show extraordinary signs of sight

14 hours ago

University of Adelaide researchers have made a surprising discovery in the aquifers beneath the Western Australian desert, which challenges the traditional Darwinian view of evolution.

Every time a fig is born there is a wasp massacre

14 hours ago

"Don't put all your eggs in one basket" is a common refrain. But usually it is not followed by the words "because your neighbours may kill you". However, this is precisely the scenario faced by some female ...

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.