Mating with a virgin female may be a preference among some
human males, possibly decided by their cultural or social training background.
But it is the most preferred option among the fruit fly (Drosophila melanogaster) males, and they make the choice based on a
learning process, says recent research.
It was earlier noticed that male fruit flies which try to
court with already mated females are often rejected by them. However, a
rejected male, more successfully spots virgin females later. It was a mystery that
how the males were able to distinguish mated females from virgins. Now, the mystery
has been unraveled.
cis-Vaccenyl Acetate (cVA) a.k.a the pheromone key to the mystery
As per the study, a pheromone (particular chemicals produced
by insects to communicate between the members of the community) named cis-Vaccenyl
Acetate (cVA) helps male fruit flies to identify mated females. cVA is usually
deposited on female fruit flies while mating, thus making them different from other
virgin females.
Drosophila
melanogaster
Image courtesy: Wikimedia Commons
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While trying to unravel the mystery behind how the fruit flies
successfully understood the pheromone signal, the researchers found that the dopamine
levels in their brain have a direct connection to the phenomenon.
Dopamine lessons for the fruit flies
The research has found that the dopamine level in the brain
in a fruit fly male fluctuate when they come closer to a female for mating. According
to the researchers, the dopamine fluctuation in the presence of cVA on a mated
female and the subsequent rejection by her, function as a learning process in
males. Thus an unsuccessful courtship increases the male fruit fly’s
sensitivity towards the presence of the pheromone, decreasing the chances of it
selecting an already mated female for courtship later.
“The learning experience can be mimicked by artificial activation of dopaminergic neurons, and we identify a specific class of dopaminergic neuron that is critical for courtship learning. These neurons provide input to the mushroom body (MB) γ lobe, and the DopR1 dopamine receptor is required in MBγ neurons for both natural and artificial courtship learning”, says the paper.
Thus the study has revealed that learning triggered by dopaminergic neurons has a major role in deciding the mating strategies of the fruit flies, and possibly in other insects and organisms.
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