Using sound to detect Formica rufa behavioural changes to a common pesticide

Area of Science:

• Environmental Science
• Ecotoxicology
• Behavioral Ecology

Background:

• Soil macrofauna face high pesticide exposure risks.
• Non-invasive methods are needed to assess in situ responses to contaminants.
• Ant colonies are sensitive indicators of environmental changes.

Purpose of the Study:

• To test acoustic monitoring for detecting sub-lethal behavioral shifts in ant colonies.
• To investigate the effects of imidacloprid on red wood ant behavior.
• To establish a non-invasive tool for pesticide impact assessment in soil ecosystems.

Main Methods:

• Utilized sound recordings to monitor outdoor activity of red wood ants (Formica rufa).
• Exposed ant colonies to environmentally relevant, sub-lethal levels of imidacloprid.
• Analyzed acoustic data for changes in behavior patterns over time.

Main Results:

• Acoustic variables detected significant shifts in ant behavior, specifically increased activity.
• Pesticide-induced hyperactivity was observed at sub-lethal imidacloprid concentrations (10.8 ± 5.7 ng g-1).
• Observed short-term (<6 h) hyperactivity followed by a week-long recovery period.

Conclusions:

• Acoustic monitoring is a promising non-invasive tool for detecting pesticide effects on soil fauna in natural environments.
• The study highlights the potential of sound recordings to reveal subtle, long-term behavioral changes.
• Recommendations for best practices in acoustic monitoring of soil fauna are provided.