Kinship And Seasonal Migration Among the Aymara of Southern Peru: Human Adaptation to Energy Scarcity
Kinship And Seasonal Migration Among the Aymara of Southern Peru: Human Adaptation to Energy Scarcity
Collins, Jane Lou
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Low partial pressures of oxygen and carbon dioxide have a detrimental effect on plant development, as does low humidity, which results from high rates of evapotranspiration. Strong diurnal variation in temperature may be stressful to plants and animals, by interrupting physiological processes (Thomas and 93 Winterhalder 1976). Some investigators feel, however, that this factor may actually give plants some advantage, since the large amount of sun- light they receive during the day encourages pr...oduction of plant matter through photosynthesis, while low temperatures at night reduce its con- sumption through respiration (Schwabe 1968). Which of these theories is correct has yet to be resolved by plant physiologists; however, on the surface, altipl ano crop yields do not seem to justify the assumption that diurnal variation gives plants any great advantage. A final deterrent to productivity on the altiplano is the poor quality of the soils. They are generally characterized as "undeveloped" because cold and dryness inhibit the decomposition of organic matter which ordinarily makes it available to plants (Schwabe 1968; Papadakis 1969).
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