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Topic: Geographical isolation

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	Geographical isolation - Wikipedia, the free encyclopedia
		Geographic isolation, or allopatry, is a term used in the study of evolution.
		Geographical isolation is thus a key factor in speciation, the formation of new species - also termed allopatric speciation.
		Researchers at the University of California, San Diego (UCSD) have argued that divergence due to geographical isolation has gone further, and the elephants of West Africa should be regarded as a separate species from either the savanna elephants of Central, Eastern and Southern Africa, or the forest elephants of Central Africa.
	en.wikipedia.org /wiki/Geographical_isolation (387 words)

	Speciation
		Geographical isolation is perhaps the simplest mechanism of isolation to achieve.
		Continents collide, mountains are uplifted (or other mechanisms of geographical isolation), and suddenly this once vast and homogeneous population finds that it is splintered into a large population as well a number of geographically isolated smaller populations.
		What was once a vast and robust parental population surrounded by a few barely holding on, geographically isolated populations, now consists of a significantly smaller, somewhat impoverished parental population and one or a few smaller populations which are holding their own.
	www.mansfield.ohio-state.edu /~sabedon/biol1515.htm (3204 words)

	SparkNotes: Reproduction Isolation: Pre-zygotic Barriers to Reproduction
		Spatial isolation occurs between populations that are separated by great distances, but it can also take place between populations that inhabit different parts of the same area.
		For example, if two populations of flies exist in the same geographical area, but one group lives in the soil and another lives on the surface of the water, members of the two populations are very unlikely to meet and reproduce.
		Temporal isolation represents another way in which populations living in the same area can be prevented from mating.
	www.sparknotes.com /biology/evolution/reproductiveisolation/section1.html (543 words)

	Isolation
		Hannah ELC 4AO Dec 23, 1999 Isolation is defined in the Webster’s Encyclopedic Dictionary as occurring when something is “placed apart or alone.” Naturally, humans are faced with feelings of isolation at certain times throughout their lives.
		Humans are often driven mad by isolation, where their only means of escaping is by death.
		Isolation is a fundamental human fact in which we all strive to break free of or avoid.
	www.freeessays.cc /db/28/lfm216.shtml (1445 words)

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