Table 1.

Origins of the four populations of Drosophila mojavensis in this study, the biotic regions of the desert they are located in (Etges et al., 1999), and numbers of flies used to establish laboratory populations. All flies were collected over banana baits in nature unless otherwise noted. The last two digits of each stock number indicate year of collection except for OPNM08a

Population	Stock number	Latitude longitude	Number of founders
Punta Onah, Sonora (Central Gulf Coast)	PO07	29°5′23.15″N	472b
		112°10′15.59″W
Organ Pipe National Monument, AZ(Arizona Upland)	OPNM08	31°58′4.88″N	20 isofemale lines
		112°46′5.75″W
San Quintin, Baja California (San Pedro Martir)	SQ08	30°30′41.88″N	372c
		115°53′34.51″W
Punta Prieta, Baja California (Vizcaino)	PP08	28°52′43.48″N	465
		114°7′28.90″W

^aTen to 20 adults from each isofemale line collected in May 2007 were combined and mass reared for at least six generations in 2008 to form this stock. Lines were provided by S. Castrenzana.

^bIncludes ca 80 adults aspirated from agria rots.

^cIncludes 355 adults that emerged from 3 agria rots.