“…These were classically described by the geographers Pulgar Vidal (1981), Tosi (1960), and Troll (1968; Troll seems to be the conceptual forebear of Pulgar Vidal and Tosi, as well as Murra (Gade 1996). Inspired by von Humboldt's pioneering work (Mathewson 1986) and drawing on more recent work on ''man-land'' relationships in the Americas by Sauer (e.g., 1956Sauer (e.g., , 1958, these geographers drew on both scientific description of ecological zones, defined by such geographic factors as altitude, temperature, and insolation (Tosi and Troll), and the identification and formalization of indigenous ethno-classification of altitudinal and ecological zones (Pulgar Vidal). These coarsegrained, sweeping studies have been complemented by detailed examinations of the ecological situations of particular communities (e.g., Brush 1976Brush , 1977Mayer 1979;Winterhalder and Thomas 1978).…”