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''Ecological Imperialism: The Biological Expansion of Europe, 900-1900'' is a 1986 book written by Alfred Crosby. ==Contents== Crosby begins by pointing out that the populations of what he calls the "Neo-Europes" of temperate zones are primarily composed of European descendants. He asks why there are such large concentrations of Europeans in these lands which are so distant from Europe. Furthermore, why have these locations been able to routinely produce large food surpluses and why are many of the countries located in these regions able to consistently be among the world's largest exporters of food?〔Crosby, Alfred W. Ecological Imperialism. Second ed. New York: Cambridge UP, 2004.〕 Although Europeans as a whole were reluctant to leave the familiarity of their homelands to start a new life abroad until the early 19th century, the Neo-Europes experienced a great influx of European settlers between 1820 and 1930. According to Crosby, this mass emigration was caused by conditions within Europe at the time, such as “population explosion and a resulting shortage of cultivable land, national rivalries, persecution of minorities,” alongside “the application of steam power to ocean and land travel."〔 But what was so appealing about the Neo-Europes to warrant being selected as the primary locations for European expansion? Crosby's explanation for the success of European imperialists is biogeographical. Europe and the Neo-Europes all share similar latitudes. That is, Europe and the Neo-Europes "are all completely or at least two-thirds in the temperate zones, north and south, which is to say that they have roughly similar climates."〔 This is significant because the plants and animals Europeans have traditionally relied upon for sustenance tend to require a warm-to-cool climate that receives 50 to 150 centimeters of annual precipitation to flourish. Therefore, just as farming was able to spread from the Fertile Crescent, east and west, without much difficulty, replacing the hunter-gatherer lifestyle along the way, so was it able to in the Neo-Europes.〔 But before this could take place, because the indigenous flora and fauna in the Neo-Europes were different from those located in Europe, the foreign biota brought to the New World by Europeans would have to compete with the local one to survive. This would ultimately result in the complete devastation of the native floras and faunas. Crosby says: "the regions that today export more foodstuffs of European provenance – grains and meats – than any other lands on earth had no wheat, barley, rye, cattle, pigs, sheep, or goats whatsoever five hundred years ago."〔 Rather than give credence to claims of innate European superiority and the like, Crosby explains the relative ease with which Europeans conquered the Neo-Europes as being a product of biological and ecological processes. One of the major contributors to European domination was disease, which is a natural byproduct of human interaction with animals. Consequently, when Europeans shifted from being hunter/gatherers to being farmers who settled in large, stationary communities and domesticated small animals, they exposed themselves to conditions that engendered diseases that would later assist them in conquering the Neo-Europes. Some such carriers of diseases were the mice, rats, roaches, houseflies, and worms that were able to accumulate in these urban settings.〔 Because Europeans were living in an environment where they were in close contact with domestic animals and the germs that accompany them, the same germs from which many of the devastating diseases of humans have sprung, they were constantly being subjected to disease.〔 And though millions of lives were lost when diseases like the Black Death ravaged Europe during the Middle Ages, a natural consequence of these frequent epidemics was a population that had built up a resistance to these diseases. Each epidemic would spare some individuals who were biologically more capable of resisting the virus. After undergoing this process for a number of centuries, the entire population eventually acquired at least some minor immunological defense against diseases such as measles and smallpox. However, because the majority of the native populations to the Neo-Europes were still participating in hunting/gathering and did not interact with animals in the same manner as Europeans, they were never exposed to such diseases. Therefore, “When the isolation of the New World was broken . . . the American Indian met for the first time his most hideous enemy: not the white man nor his black servant, but the invisible killers which those men brought in their blood and breath.”〔Crosby, Alfred W. ''The Colombian Exchange''. Westport: Praeger Publishers, 2003.〕 Because the Europeans arrived in the Neo-Europes with diseases that were absolutely new to those locations, they had an enormous advantage over the indigenous peoples and the consequences were overwhelming. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ecological Imperialism: The Biological Expansion of Europe, 900-1900」の詳細全文を読む スポンサード リンク
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