Abstract
Imported fire ant,Solenopsis invicta Buren, colonies in weedy and weed-free Louisiana sugarcane habitats were labeled with the nonradioactive, stable-activable tracer element samarium, to be compatible with an agroecosystem in current food production. Instrumental neutron activiton analyses of samarium revealed that the ants foraged 9% of the sampling stations in weed-free areas and 6.4% of the stations in weed habitats. The significantly smaller territorial size in weedy areas was a result of more dense prey populations, which, encouraged greater ant colonization and 25% more foraging activity per unit area.S. invicta foraging activity was negatively correlated (r=−0.68; P≤0.02) with that of another ant,Paratrechina vividula.
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