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Pheromones are released into an atmosphere that is filled with environmental, habitat-related odorants, some of which manifest mating sites and food sources.The response to sex pheromones and food or habitat olfactory cues (kairomones) falls under sexual and natural selection, respectively.Tuning changes in the two Or69a variants are constrained to a behavioural theme since they are expressed in one OSN and feed into a neural circuit mediating sex and food attraction.The two Or variants provide, on the other hand, degrees of freedom during adaptive divergence, since they allow fly populations to adopt new kairomone or pheromone signals; alteration of either one produces a new communication channel.A blend of this pheromone and a food odorant specifically attracts ].Our scope was to investigate volatile compounds mediating long-range communication, which are sensed by an Or at a distance and elicit upwind flight attraction.

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Since Or69a A and Or69a B are more similar to each other than to other Ors, it is conceivable that the Or69a A exon has arisen from a duplication of the ancestral Or69a B exon, which is found throughout ].

and related species are known to be attracted to fermenting fruit for feeding and egg-laying, which poses the question of whether species-specific fly odours contribute to long-range premating communication. They are co-expressed in the same olfactory sensory neurons, and feed into a neural circuit mediating species-specific, long-range communication; however, the close relative Sexual communication subserves mate-finding and ultimately reproduction, which relies on finding mates and food for offspring.

Volatile pheromones transmit species-specific messages over a distance to facilitate mate finding, which is particularly adaptive in short-lived insects [].

Oxidation of 7,11-HD is expected to generate two saturated aldehydes, heptanal and hexadecanal, and two unsaturated aldehydes, )-carvone (8) and Z4-11Al (10).

Alignment of these ligands illustrates shared structural motifs.

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