Columbian exchange

Inca-era terraces on Taquile are used to grow traditional Andean staples, such as quinoa and potatoes, alongside wheat, a European introduction.

The Columbian Exchange was a dramatically widespread exchange of animal, plants, culture (including slaves), communicable diseases, and no between the Eastern and Western hemispheres. It was one of the most significant events concerning ecology, agriculture, and culture in all of human history. Christopher Columbus' first voyage to the Americas in 1492 launched the era of large-scale contact between the Old and the New Worlds that resulted in this ecological revolution, hence the name "Columbian" Exchange. The term was coined by Alfred W. Crosby, a historian, professor and author, in his 1972 book The Columbian Exchange.

The Columbian Exchange greatly affected almost every society on Earth. New diseases introduced by Europeans (many of which had originated in Asia), to which the indigenous peoples of the Americas had no immunity, depopulated many cultures. Data for the pre-Columbian population in the Americas is uncertain, but estimates of its disease-induced population losses between 1500 and 1650 range between 50 and 90 percent.

On the other hand, the contact between the two areas circulated a wide variety of new crops and livestock which supported increases in population in both hemispheres. Explorers returned to Europe with maize, potatoes, and tomatoes, which became very important crops in Eurasia by the 18th century. Similarly, Europeans introduced manioc and the peanut to tropical Southeast Asia and West Africa, where they flourished and supported growth in populations on soils that otherwise would not produce large yields.

Influence

Portuguese exchanging animals in Japan, detail of Nanban panel (1570-1616)

This exchange of plants and animals transformed European, American, African, and Asian ways of life. New foods became staples of human diets, and new growing regions opened up for crops. For example, before AD 1000, potatoes were not grown outside of South America. By the 1840s, Ireland was so dependent on the potato that a diseased crop led to the devastating Irish Potato Famine. Since being introduced by 16th century Portuguese traders, who brought them from the Americas, maize and manioc replaced traditional African crops as the continent’s most important staple food crops. New crops that had come to Asia from the Americas via Spanish colonizers in the 16th century, including maize and sweet potatoes, contributed to the population growth in Asia, too.

One of the first European exports, the horse, changed the lives of many Native American tribes on the Great Plains, allowing them to shift to a nomadic lifestyle based on hunting bison on horseback. Tomato sauce, made from New World tomatoes, became an Italian trademark, while coffee from Africa and sugar cane from Asia became the main crops of extensive Latin American plantations. Introduced to India by the Portuguese, the chili/paprika from South America is today an integral part of Indian cuisine.

New World native plants. Clockwise, from top left: 1. Maize (Zea mays) 2. Tomato (Solanum lycopersicum) 3. Potato (Solanum tuberosum) 4. Vanilla (Vanilla) 5. Pará rubber tree (Hevea brasiliensis) 6. Cacao (Theobroma cacao) 7. Tobacco (Nicotiana rustica)

Before the Columbian Exchange, there were no oranges in Florida, no bananas in Ecuador, no paprika in Hungary, no tomatoes in Italy, no coffee in Colombia, no pineapples in Hawaii, no rubber trees in Africa, no cattle in Texas, no donkeys in Mexico, no chili peppers in Thailand and India, no cigarettes in France, and no chocolate in Switzerland. The dandelion was brought to North America by Europeans for use as a herb.

Old World native plants. Clockwise, from top left: 1. Citrus (Rutaceae); 2. Apple (Malus domestica); 3. Banana (Musa); 4. Mango (Mangifera); 5. Onion (Allium); 6. Coffee (Coffea); 7. Wheat (Triticum spp.); 8. Rice (Oryza sativa)

Of the world's top 20 crops, measured by weight of production in 2007, five (maize, potato, cassava, tomato and sweet potato) originated in the Americas while a sixth, grapes, is most commonly a European plant grafted onto an American rootstock. The remaining Old World origin crops in the top twenty are all grown throughout the world today (cow milk, soybeans, wheat, sugar beet, sugar cane, rice, oranges, onions, sorghum, hen eggs, barley, lettuce, chicory and apples). One-half of the top crops by weight within the United States depends on foods that were first grown in the Americas (but only 39% by value).

Before regular communication had been established between the two hemispheres, the varieties of domesticated animals and infectious diseases, such as smallpox, were strikingly larger in the Old World than in the New, in part because many migrated west or were brought by traders from Asia, so diseases of two continents were suffered by all. "Old World" diseases had a devastating impact on Native American populations because they had no natural immunity to the new diseases. While Europeans and Asians were affected by them, their endemic status in those areas caused some people to build immunity. The smallpox epidemics probably resulted in the largest death tolls for Native Americans.

Examples

See also: New World Crops and Agriculture in Mesoamerica

Pre-Columbian Distribution of Native Organisms with Close Ties to Humans

Type of organism	Old World to New World	New World to Old World
Domesticated animals	bee cat camel chicken cow goat goose honey bees horse rabbit (domestic) pig rock pigeon sheep silkworm water buffalo	alpaca guinea pig llama turkey
Domesticated plants	almond apple apricot artichoke asparagus banana barley beet black pepper cabbage cantaloupe carrot coffee citrus (orange, lemon, etc.) cucumber eggplant flax garlic hemp kiwifruit kola nut lettuce mango millet oat okra olive onion opium peach pea pear pistachio radish rhubarb rice rye soybean sugarcane taro tea turnip wheat walnut (English) watermelon	amaranth (as grain) avocado common beans (pinto, lima, kidney, etc.) black raspberry bell pepper blueberry cashew chia chicle chirimoya chili peppers cranberries (large cranberry, or bearberry species) coca cocoa cotton (long staple species) guava (common) huckleberry jicama maize (corn) manioc (cassava, tapioca, yuca) papaya peanut pecan pineapple potato pumpkin quinoa rubber squash strawberry (commercial varieties) sunflower sweet potato tobacco tomato vanilla zucchini
Infectious diseases	bubonic plague chicken pox cholera influenza leprosy malaria measles scarlet fever smallpox typhoid typhus yellow fever yaws

Unintentional introductions

Further information: Introduced species, Invasive species, and List of invasive species

Plants that arrived by land, sea, or air in "ancient" times (or before 1492 in the U.K.) are called Archaeophytes, and plants introduced to Europe after those times are called Neophytes.

In addition to the diseases mentioned above, many species of organisms were introduced to new habitats on the other side of the world accidentally or incidentally. These include such animals as brown rats, earthworms (apparently absent from parts of the pre-Columbian New World), and zebra mussels, which arrived on ships.

Invasive species of plants and pathogens also were introduced by chance, including such weeds as tumbleweeds (Salsola spp.) and Wild oats (Avena fatua). Some plants introduced intentionally, such as the Kudzu vine introduced in 1894 from Japan to the United States to help control soil erosion, have been found to be invasive pests in the new environment. Even fungi have been transported, such as the one responsible for Dutch elm disease bringing demise to American elms in forests and cities. Some of the invasive species have become serious ecosystem and economic problems after establishing in the New World environments.

See also

• Alfred Crosby
• Domestication
• Guns, Germs, and Steel
• Population history of American indigenous peoples
• Pre-Columbian trans-oceanic contact
• Transformation of culture

Bibliography

• Crosby, Alfred W., Jr (1972, 2003 reissue). The Columbian Exchange: Biological and Cultural Consequences of 1492;30th Anniversary Edition. Greenwood Publishing Group. ISBN 0275980928. {{cite book}}: Check date values in: |year= (help)CS1 maint: multiple names: authors list (link) CS1 maint: year (link)

External links

• The Columbian Exchange: Plants, Animals, and Disease between the Old and New Worlds in the Encyclopedia of Earth by Alfred W. Crosby
• Worlds Together, Worlds Apart by Jeremy Adelman, Stephen Aron, Stephen Kotkin, et al.
• New study blames Columbus for syphilis spread from Reuters Jan 15, 2008
• Foods that Changed the World
• The Columbian Exchange study guide, analysis, and teaching guide
• NBC News piece on Columbian Exchange