Friday, June 6, 2008

Bees learn new languages easily

Bees from opposite ends of the Earth can communicate more easily than people, a discovery that suggests bees can learn a new language easily.

Asian and European honeybees can live happily together in mixed colonies because they easily learn to understand one another's "dance languages" despite having evolved different dialects, an international team has shown for the first time.

Bee happy: An Apis cerana cerana queen (yellow) being tended by Apis mellifera ligustica workers (red) and Apis cerana cerana workers (green)
Bee happy: Apis cerana cerana queen (yellow) tended by Apis mellifera ligustica (red) and Apis cerana cerana (green) workers

The findings will shed new light on the origins of this ancient form of communication and also suggest that, like people, bees can learn a new skill.

The nine species of honeybees found worldwide separated about 30 to 50 million years ago, and subsequently developed different dance 'languages'. The content of the messages is the same, but the precise encoding of these languages differs between species.

Now researchers from Australia, China and Germany report in the journal Plos ONE that the two most geographically distant bee species - the European honeybee Apis mellifera and the Asian honeybee Apis cerana - can share information and cooperate to exploit new food sources.

'We know that the members of a honeybee colony routinely exchange information via dance about the location of newly discovered locations, like feeding places, water or new nesting sites," explains Dr Shaowu Zhang from the Research School of Biological Sciences at The Australian National University.

"The scouts perform the so-called bee dances inside the nest. The coordinates of distant locations are encoded in the waggle phase of this ballet, with the direction and distance to the food source indicated by the orientation and duration of the dance.

"This duration differs across honeybee species, even if they fly the same distance in the same environment. It's these differences which we can think of as distinct languages."

The research team is the first to successfully study the behaviour of a colony containing a mixture of two different species of bees. One of the first findings of this novel approach was that Asian and European honeybees, after some time of adjustment in the mixed colony, could share information and work together to gather food. Asian honeybees followed the dances of European forager bees, and deciphered the encoded information correctly.

"The dance language of honeybees is among the best studied communication systems in the animal kingdom. Nevertheless, surprises are still possible, as we have shown," Dr Zhang said. "This work has potentially major implications for our understanding of animal communication. Next we plan to study exactly to what extent variation is a factor between different bee dance languages."

The study was done with Drs Shenglu Chen and Songkun Su from Zhejiang University in China and Dr Jürgen Tautz from Würzburg University in Germany.

Original here

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