Oxidizing pollutants can disrupt nestmate recognition in ants

Area of Science:

• Chemical Ecology
• Environmental Toxicology
• Behavioral Ecology

Background:

• Eusocial insects like ants rely on cuticular hydrocarbons (CHCs) for nestmate recognition.
• Alkenes, a component of CHC profiles, are vital for distinguishing colony members.
• Alkenes are susceptible to degradation by oxidizing pollutants such as ozone.

Purpose of the Study:

• To investigate the impact of elevated ozone exposure on alkene profiles in ant CHCs.
• To assess the consequences of ozone-induced CHC alterations on nestmate recognition.
• To evaluate the effects of long-term ozone exposure on ant colony behavior and survival.

Main Methods:

• Analysis of cuticular hydrocarbon profiles in six ant species after short-term ozone exposure.
• Behavioral assays to test nestmate recognition following ozone exposure.
• Observation of brood care and colony health during long-term ozone exposure experiments.

Main Results:

• Short-term ozone exposure degraded alkenes in the CHC profiles of all tested ant species.
• Nestmate recognition was compromised in five out of six ant species after ozone exposure.
• Long-term ozone exposure disrupted brood care, leading to larval death and colony decline.

Conclusions:

• Ozone pollution poses a significant threat to the chemical communication systems of social insects.
• Degradation of cuticular hydrocarbons by oxidants can impair essential social behaviors like nestmate recognition.
• The findings suggest that oxidant pollutants may have far-reaching negative impacts on the viability of eusocial insect colonies.