Figure 1.

Sites used in this study. Introduced populations of Argentine ants were sampled in Chile, Bermuda, and the United States. Sampling sites in the United States included New Orleans, Louisiana and the following sites in California: Ukiah (UK), Sausalito (SA), Palo Alto (PA), San Jose (SJ), Salinas (SL), King City (KC), Morro Bay (MB), Santa Maria (SM), Santa Barbara (SB), Los Angeles (LA), Temecula (TE), Encinitas (EN), La Jolla (LJ) and Sweetwater Reservoir (SW). Sites in San Diego County, California not shown: Solana Beach, Lake Hodges and Mission Trails Regional Park. Native populations in Argentina include: Itá-Ibaté (IT), Isla de las Cerritas (IC), Porto Ocampo (OC), Alvear (AL), Parque Nacional PreDelta (PD), Colón (CO), Rosario (RO), Ibicuy (IB), Reserva Nacional Ecológica Otamendi (OT), Buenos Aires (BA), and Reserva Ecológica Costanera Sur (CS). (Bars in the expanded maps represent 100 km.)