A. Location of study site in western Kenya. Small insert map shows Kenya; red box indicates study region in western Nyanza province. Locations of Asembo and Seme are indicated. Green box indicates sampling transect from 2003 to 2009 (as in B and C). B. Google Earth satellite image of transect region in the Asembo and Seme study area, showing lake plain topography, numerous stream courses, and rural agricultural landscape. C. 12 km sampling transect from Asembo into Seme, showing location of mapped, sampled compounds in 2003. D. Photograph of study area facing north, showing housing compounds, surrounding farmland, and topography.