arch. lecture 5 Flashcards
Setting the Stage for Agricultural Origins
- At the end of the Pleistocene (Ice Age) and beginning of Holocene, environments were unstable and changing rapidly.
- sea levels rose
- climate changed from cold and dry to warm and wet
- ecosystems changed rapidly
- e.g. from tundra to forests in Europe; expansion and contraction of forests and grasslands in southwest Asia
- in many regions animals in large herds were replaced by more solitary species
- these factors posed a great challenge to hunter-gatherers, leading to broad-spectrum collecting.
Broad-Spectrum Collecting
- instead of relying on a few major food sources, especially big game, development of a greater reliance on multiple food sources.
- often smaller package foods (think rabbits as opposed to mammoths), and foods that required more specialized technologies to hunt, harvest, or prepare (e.g., grains, nuts, fish, shellfish, birds, small mammals)
- broad-spectrum collectors in some cases developed further, leading to the origins of agriculture.
Origins of Agriculture
- agriculture: subsistence based on domesticated plants and animals.
- domestication: taming of wild plants and animals by humans, involving physical and/or behavioural modification.
The Neolithic period – earliest food producing cultures
- Agriculture arose independently in multiple locations, over only a few thousand years
- Timing and importance based largely on the “luck of the draw” – some regions had naturally occurring plants and animals that were easily domesticated
Plant Domestication
- most important are seed and root crops
- domestication involves selection of best individuals for planting
- “best” means – large amount of edible material, easy to harvest, easy to store
- Example: wheat, domesticated in the Near East:
- rachis (stalk connecting the seed to the seed head) changes from brittle to tough, making wheat easier to harvest
- individual seeds become larger, providing more food
- domesticated wheat is now dependent on humans for reproduction
How quickly does domestication happen?
- theories range from very fast (a few decades) to very slow (millennia).
- earliest stage: unintentional tending - plants are unintentionally helped by burning or disposing of seeds in optimal areas such as middens. Also, selecting biggest or best individuals to eat.
- later: intentional cultivation (e.g., removing weeds, dispersing seeds)
- eventually, this can lead to domestication in which the plant is altered enough that it needs human intervention for its survival
Animal Domestication
- initially - probably domesticated for meat (with exception of dog)
- sheep, goat, cattle, pig, llama are all herd animals – “preadapted” to domestication - later - “Secondary Products Revolution” - used for purposes other than just meat:
- e.g., milk (cheese, yogurt, butter, etc.), wool, skins, horn
- also traction (strength) – horses for riding, cattle for pulling ploughs or wagons, etc.
- all of these involved some physical changes, observable archaeologically
- animal diseases become more common
- animal domestication may have begun with “herd management” - sparing females and young
Why and How Did Agriculture Begin?
- Hunter-gatherer way of life was satisfying, and for tens of thousands of years, they had not developed agriculture.
- Broad-spectrum hunter-gatherers were complex and specialized, with intimate knowledge of a range of plants and animals in their territories, as well as specialized technologies for their acquisition and storage
- Unlike earlier hunter-gatherers, population densities were now quite high.
Oasis Hypothesis | Beginning of Agriculture
- 1940s
- end of Ice Age, world became more hot and dry.
- people, plants, and animals became concentrated near oases.
- hunter-gatherers gradually developed symbiotic relationship with animals and plants.
- e.g. stubble from grain fields attracted animals.
Natural Habitat Hypothesis | Beginning of Agriculture
- (“Hilly Flanks Theory”)
- 1950s
- certain restricted areas contained the wild ancestors of domestic species.
- hunter-gatherers in these areas simply became more and more familiar with plants and animals, exploiting and protecting them more and more efficiently.
- aspects of this hypothesis are valid, with major species domesticated in their wild ancestors’ range; examples:
- rye: 10,000BCE
- wheat and barley: 9000BCE
- sheep/goats: 8500BCE
- however, this hypothesis doesn’t explain why agriculture happened.
Population Pressure Hypothesis | Beginning of Agriculture
- 1970s
- gradual population pressure throughout human history has led to many major changes / innovations
- at the end of the Pleistocene, increasing populations led people to need to get more food out of each given area of land, leading in some cases agriculture as people experimented with new ways to increase yields.
- this process may have been most pronounced at the margins of “natural habitats” for domesticated species
Recent Hypotheses | Beginning of Agriculture
- acknowledge that there may be no single “grand theory” to explain every case of agricultural origins
- are often specific to individual regions
- usually rely on a complex interplay of many factors, no “prime mover” (single factor)
- however, many rely in part on environmental change and population pressure as part of the explanation
- also, social factors are often considered: status-seeking individuals seek a surplus of food, which can be transformed into prestige through trade or distribution to others
Adoption of Agriculture by Neighbouring Goups | Consequences of Food Production
- spread rapidly to all areas where it was feasible
- allows more people to make a living from a given area of land
- allows an advantage in competition with neighbouring hunter-gatherers
Dramatic Population Increases | Consequences of Food Production
- food supply larger and more stable
- birth spacing can be reduced in a sedentary community
Altering the Environment | Consequences of Food Production
- Environment altered more severely - cutting, burning, grazing, etc.
- especially deforestation
Health Deteroirates | Consequences of Food Production
- hunter-gatherers generally have well balanced diets
- for agriculturalists, nutrition, health, and lifespan often decreased
- concentrated, larger settlements increased susceptibility to disease
- reliance on a few crops left populations vulnerable to critical shortages if crop failed
Social Satisfaction | Consequences of Food Production
- social satisfaction increases.
- larger populations live together for longer periods of time
- requires new mechanisms for peaceful interaction, dispute settlement, decision-making.
- agriculture allows accumulation of surplus, which can be used by emerging elites to increase their status.
- social and economic inequality becomes much more common