Date: 8th May 2020
Now for more information......
The sense of taste is very important for a variety of reasons:
This means being able to detect the difference between things that are edible and for bees, it also may help them to detect the nutrient value of the pollen and nectar they are gathering.
For example, the ‘sweetness’ quality of a food is usually an indicator of a high amount of sugar (or carbohydrate) which provides lots of calories, and hence sugars (carbohydrates) are high energy foods. Nectar is important for bees because they use a high amount of energy relative to their size for their daily survival, in activities such as flying, vibrating their wings, tending the colony and larvae etc. Other nutrients in pollen, such as amino acids and proteins are important for developing larvae.
Each honey bee colony has its own unique 'chemical signature' which colony members use to recognize each other, as well as detect bees from other colonies. Communication between bees is based on chemical signals, and these are transmitted via taste and scent when bees feed and groom each other (this includes the larvae, drones and queens).
Honey bees use water for diluting honey stores and temperature control in the nest or hive. Interestingly, honey bees often prefer slightly salty water, and it has been found that salts are important for the development of larvae.
The sense of taste can be important when collecting other things, such as resins used for nest construction and protection.
‘Taste buds’ are also known as ‘taste receptors’ or ‘taste sensors’, and they are responsible for detecting and identifying different taste sensations (stimuli).
Of course, the tongue is considered to be most important for the sense of taste in humans.
In the honey bee, the taste receptors on bees look a bit like hairs, and these sensors are found on:
Central processing of taste occurs mainly in the central nervous system in the subesophageal ganglion, but the nature of this processing remains unknown. The subesophageal ganglion is located below the oesophagus, inside the head.
Honey bees respond with varying sensitivity to sugars, salts, and possibly amino acids, proteins, and water.
It seems bees naturally avoid highly concentrated bitter tastes.
In scientific experiments, bees automatically stick their tongues out when they sense the presence of food. For bees, this is an automatic reflex (it’s actually called a proboscis extension reflex [PER]).
Scientists devised experiments in which they stimulated the legs, antennae and mouth parts with different tasting foods, and found that bees automatically stick out their tongues in response to acceptable tastes. For example, if antennae were presented with a suitable food, the honey bee was observed to stick out its tongue.
Scientists have also been able to view the reactions of the actual taste buds (or taste receptors) in each area, using a very powerful microscope, in response to different tastes.
Interestingly, scientists found that in honey bees, the taste sensors on the very tip of the antennae are more sensitive than those actually on the tongue (and more sensitive than those on the feet)!
Scientists have counted over 300 taste-sensing hairs on the antennae, so what role do the antennae play? Antenna are especially important for locating potential food sources. This is called ‘appetitive food sensing’.
I wonder whether this could also explain why bees sometimes linger a moment close to a flower, only to fly off without entering it – especially if the flower has been visited only moments before by another bee that has already taken the nectar. Perhaps their antennae are telling them there is no nectar available in the flower?
Both the jaw (mandibles) and tongue (proboscis) have taste sensors. The taste receptors particularly in the tongue and mouth are known to detect sweet tastes, but it is thought by some scientists that the taste of amino acids and proteins are also sensed here.
Scientists propose that the taste sensors within the mouth and tongue are important for processing the taste of the food before it passes down the food pipe (oesophagus).
Interestingly, the feet not only pick up sweet tastes, they also detect salty tastes and water.
Take into account that honey bees may perform the role of ‘water carrier’ for the colony. It has been shown that bees rather like water that is slightly salty. It appears they don't mind very salty water, if it is sea water. It is thought that various salts (sodium, magnesium and potassium) are essential for developing larvae.
As an aside, other bee species are also known to be attracted to salt – for example, Halictidae are commonly known as ‘sweat bees’, because they are attracted to human salty perspiration!
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