4 Cultural Adaptations to a Mountain Environment
lands. The literature on these zones and the respective land use patterns and
cultural configurations is extensive.1 The characteristic approach has been
an area-wide or macro-environmental one for the cultural geography and ec-
ology of the area (e.g., James 1959, Sauer 1950). Whereas the general char-
acteristics of the natural and cultural ecology are well described in macro-
environmental studies, the complexity and variety within the major zones,
especially the highlands, tend to be glossed over. There are some exceptions
to this (notably Bowman 1916 and Gade 1967), but the tradition of macro-
environmental studies persists (Fittkau I and II 1969).
The macro-climate of the Peruvian Andes must be understood along
three axes: longitude, latitude, and altitude. As one goes east to west across
the Andean Cordilleras from the Amazon Basin to the Pacific, the climate
becomes increasingly dry. The thin strip of coastal plain is one of the driest
deserts in the world, a sharp contrast to the humid, verdant valleys of the
eastern slopes of the Andes. Rain-bearing Pacific equatorial currents are di-
verted by the strong, cold Humboldt (Peruvian) current, and rain-bearing
easterlies lose their moisture in the highlands. The heaviest rainfall occurs on
the eastern slopes of the Andes, where the tropical forest begins. As latitude
increases from the Equator southward, the climate tends to become drier,
with less total yearly precipitation and longer dry seasons. In the northern
Andes of Peru, the dry season is only three months long (June-August),
while in the southern Andes, it extends from May to November. Another
significant phenomenon, which is tied to latitude, is photoperiod. In the
northern Andes, close to the equator, daylight hours are uniformly long (ca.
twelve hours) year round, while as one moves south, they lengthen in sum-
mer (December to March) and shorten in winter. A result is greater seasonal
variation in temperatures as one moves south. Related to this is the fact that
the snow and frost line in the south is higher during the summer, and the
upper limit of cultivation is therefore raised. The third axis, altitude, has the
greatest impact on the macro-climate of the Andes. As altitude increases cli-
matic conditions change: heat radiation increases, resulting in lower temper-
atures and a high diurnal temperature range; evaporation and insolation in-
1 Because of the complexity of the area, plant and physical geographic overviews of the
Andes are usually too general to be of much use in understanding the geography of particu-
lar places. Consequently, the best geographies concern themselves with smaller regions within
the Andes. In English, the reader is recommended to Bowman (1916), The Andes of Southern
Peru, and Gade (1967), Plant Use and Folk Agriculture m the Vilcanota Valley of Peru. Am-
bitious, but not entirely successful, overviews of Andean geography include Pulgar Vidal
(1946), Geographia del Peru: Las Ocho Regiones Natural del Peru, and Ford (1955), Man and
Land in Peru. Perhaps the most useful attempt at a geographic overview and synthesis is the
work of Carl Troll, summarized in his "The Cordilleras of the Tropical Americas" (1968: 15-
56).
The anthropological and cultural geographic literature on Peru is extremely large in Span-
ish and very sizeable in English. The most complete bibliographic summaries of this literature
are found in Matos Mar and Ravines (1971); Martinez, Cameo, and Ramirez (1969); Aguirre
Beltran, Castillo Ardiles and Miranda Pelayo (1968); and O'Leary (1963).