Argentine Ants Change Diet at Will

The ability of Argentine ants to change from carnivorous insect eaters to plant sap-loving creatures has helped these invasive social insects rapidly spread throughout coastal California, according to a new study, displacing many native insects and creating ant infestations familiar to most coastal residents.

Biologists at the University of California, San Diego and the University of Illinois at Urbana discovered the opportunistic, changing dietary preferences of California’s Argentine ants—the first time researchers have documented what these invasive ants actually eat—by studying a population of ants for eight years in the foothills southeast of San Diego. An advance copy of their paper is being published online this week in the journal Proceedings of the NationalAcademy of Sciences.

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