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The rigours and rituals of mating among fruit flies are challenging under the best of circumstances, but add ozone-laden smog into the mix and things really fly apart, according to a study published on Tuesday. Even moderate air pollution from industry and traffic not only causes males to lose their sex appeal, it also leaves them unable to discriminate between he-flies and she-flies, researchers reported in Nature Communications.
In experiments with ozone levels typically found in major cities, males engaged other males in courtship dances as much as females. The findings could be a previously unrecognised driver of accelerating decline that has been affecting nearly half of all insect species in recent decades, the scientists suggested. The radical changes in mating behaviour stem from a breakdown of the scent signals, or pheromones, used to attract sexual partners.
In experiments, the type of ozone emitted from vehicle tailpipes and factories neutralised pheromones after they were released, leading to mating mayhem. Males zeroing in on potential partners couldn't recognise other males, and females shunned the advances of males because the latter's come-hither chemicals could no longer be detected.
Breakdown of the sex-signalling chemicals in pheromones is triggered by the oxidising effect smog has on so-called integral carbon bonds and lasts for several days, the study showed. The pheromone released by male fruit flies serves as a female aphrodisiac.
