Ants as bioindicators of urban traffic pollution.

In Parma, Italy, arboreal ants Crematogaster scutellaris show magnetic susceptibility that strongly tracks traffic intensity (Spearman’s ρ = 0.825, p < 0.001).

• Why it matters: Fixed air-monitoring stations can miss fine-scale spatial variation, so a scalable sentinel approach is needed to reflect traffic-related particulate pollution.
• What they did: Across 30 traffic sites plus four controls, the team measured magnetic susceptibility and used SEM-EDS to characterize magnetic particles on ant exoskeletons and in 5 cm soil samples.
• The result: Ant-associated magnetic particulate matter correlated with traffic (ρ = 0.825, p < 0.001), while soil did not (ρ = 0.167, p = 0.346); iron oxide-rich, heavy-metal-doped particles suggest traffic-derived ultrafine inputs.

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