Honeybees have a sweet claw!
London: Sweet tooth? Honeybees have a sweet claw instead!
Honeybees love sugar-rich nectar produced by plants, and one of the main ways they detect it is with claws on their front legs, scientists say.
Researchers have now uncovered details on how this information is processed.
Insects taste through sensilla, hair-like structures on the body that contain receptor nerve cells, each of which is sensitive to a particular substance.
In many insects, for example the honeybee, sensilla are found on the mouthparts, antenna and the tarsi - the end part of the legs.
Honeybees weigh information from both front tarsi to decide whether to feed, according to the study led by Dr Gabriela de Brito Sanchez from the University of Toulouse, and Dr Martin Giurfa, Director of the Research Centre on Animal Cognition, University of Toulouse, France.
Hundreds of honeybees were included in the study. Sugary, bitter and salty solutions were applied to the tarsi of the forelegs to test if this stimulated the bees to extend or retract their tongue - reflex actions that indicate whether or not they like the taste and are preparing to drink.
Results found that honeybee tarsi are highly sensitive to sugar: even dilute sucrose solutions prompted the bees to extend their tongue.
Measurements of nerve cell activity showed that the part of the honeybee tarsus most sensitive to sugary tastes is the double claw at its end.
Also, the segments of the tarsus before the claws, known as the tarsomeres, were found to be highly sensitive to saline solutions.
"Honeybees rely on their colour vision, memory, and sense of smell and taste to find nectar and pollen in the ever-changing environment around the colony," said Giurfa.
"The high sensitivity to salts of the tarsomeres and to sugar of the tarsal claws is impressive given that each tarsus has fewer sensilla than the other sense organs.
"The claw`s sense of taste allows workers to detect nectar immediately when they land on flowers.
Also, bees hovering over water ponds can promptly detect the presence of salts in water through the tarsomeres of their hanging legs," said Giurfa.
The central nervous system of honeybees weighs contradictory information, from both sides, but unequally: input from the side that is first to taste something tasty or distasteful counts for more.
For example, if a bee first tasted sucrose on one side, she would typically extend her tongue and subsequently ignore less attractive tastes on the other.
But if the order was reversed, she was around 50 per cent less likely than normally to extend her tongue for sucrose.
The study was published in the journal Frontiers in Behavioural Neuroscience.
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