Work

Lasius flavus ants protect root aphid eggs from predators and pathogens during winter hibernation

Year: 2025

Type: article

Abstract: Cooperative brood care is key to the ecology and evolution of social insects. Interestingly, social insects may also care for the brood of other species that dwell in their nests. This study explores how the yellow meadow ant Lasius flavus cares for the eggs of the root aphid Anoecia zirnitsi and how this service affects the resistance of aphid eggs to predators and pathogens. In winter, A. zirnitsi eggs were found exclusively in L. flavus nest chambers near the ant brood. Laboratory experiments showed that L. flavus detects, transports, piles and grooms the aphid eggs. We could recapitulate these caring behaviours in L. flavus using glass beads coated with chemical cues extracted from the aphid egg surface. Other ant species did not collect or nurse the eggs, suggesting a specific interaction between L. flavus and the eggs of A. zirnitsi . We further demonstrated that L. flavus strongly increased the aphid eggs’ protection against predators and fungal pathogens. Ants, however, were not essential for the eggs to hatch, and aphid nymphs were capable of independently colonizing grass roots. Our research highlights the crucial protection services L. flavus ants provide to root aphids in winter, while the potential costs and delayed benefits (honeydew provision) of this protection for the ants should be further explored.

Source: Royal Society Open Science

DOI: 10.1098/rsos.250217

Authors: Thomas Parmentier, Nicky Wybouw

Institutions: Université Libre de Bruxelles, Ghent University

Language: English

Topic: Insect and Arachnid Ecology and Behavior

Subfield: Genetics

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

SDG: Zero hunger

Open Access status: gold

Estimated APC paid: $1,471