Harvester ants attack nest-mates whose scent they don’t recognise
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Recent studies have revealed that common air pollutants such as ozone and nitric oxide have a profound impact on the behavior of ants. These pollutants can alter the scent of ants, leading their nest-mates to mistakenly identify them as intruders and launch aggressive attacks against them.
Ants rely heavily on scent for recognizing their fellow colony members, and any deviation from the familiar scent triggers a defensive response. Ozone, a greenhouse gas produced by human activities like vehicle emissions and industrial processes, can disrupt the chemical composition of alkenes, which are crucial components of the ants’ colony-specific scents.
Markus Knaden and his team at the Max Planck Institute for Chemical Ecology conducted experiments to investigate the effects of ozone on ants. They observed that exposure to ozone altered the ants’ scent, leading to aggressive behavior from their nest-mates. Even a minor change in the scent composition caused by ozone was enough to trigger the attacks.
According to Knaden, this aggressive behavior could disrupt the efficiency of the colony in natural settings. While the ants may not always kill the intruder, the disturbances caused by these attacks can have long-term implications on the colony dynamics.
Daniel Kronauer from The Rockefeller University emphasized the importance of alkenes in nest-mate recognition among ants. He pointed out that alkenes play a crucial role in various ant behaviors, such as trail following and communication, and any disruption in their chemical signals can have far-reaching consequences.
The study also highlighted how exposure to ozone can affect the behavior of adult clonal raider ants, causing them to neglect their larvae. This neglect can disrupt the delicate balance within the ant colony and potentially impact the broader ecosystem where ants play vital roles in seed dispersal, soil movement, and symbiotic relationships with other organisms.
Researchers warn that the decline in insect populations worldwide, coupled with the detrimental effects of air pollutants like ozone, could have severe repercussions on ecosystems. While current ozone levels may not pose immediate risks to humans, the indirect impacts on insect behavior and ecosystem stability should not be overlooked.
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