Population Bottlenecks and Pleistocene Human Evolution
نویسندگان
چکیده
منابع مشابه
Population bottlenecks and Pleistocene human evolution.
We review the anatomical and archaeological evidence for an early population bottleneck in humans and bracket the time when it could have occurred. We outline the subsequent demographic changes that the archaeological evidence of range expansions and contractions address, and we examine how inbreeding effective population size provides an alternative view of past population size change. This ad...
متن کاملLate Pleistocene human population bottlenecks, volcanic winter, and differentiation of modern humans.
The "Weak Garden of Eden" model for the origin and dispersal of modern humans (Harpending et al., 1993) posits that modern humans spread into separate regions from a restricted source, around 100 ka (thousand years ago), then passed through population bottlenecks. Around 50 ka, dramatic growth occurred within dispersed populations that were genetically isolated from each other. Population growt...
متن کاملPopulation bottlenecks and patterns of human polymorphism.
Fay and Wu (1999) examine a historical model in which a population quickly shrinks, stays small for some time, and then suddenly recovers its original population size, at which it stays until samples are drawn from it. This is a bottleneck model of the kind traditionally used in population genetics (Nei, Maruyama, and Chakraborty 1975); however, it is not the model that is most commonly conside...
متن کاملPopulation bottlenecks
What are they? They occur when a wild population is reduced to a small number of individuals, and then increases again. They are typically caused by an environmental change such as unusual climatic conditions, or, increasingly, the actions of humans, as in over-hunting and habitat destruction. But if the population size is restored, everything ends up fine, surely? No. The small population size...
متن کاملEvaluating the impact of population bottlenecks in experimental evolution.
Experimental evolution involves severe, periodic reductions in population size when fresh media are inoculated during serial transfer. These bottlenecks affect the dynamics of evolution, reducing the probability that a beneficial mutation will reach fixation. We quantify the impact of these bottlenecks on the evolutionary dynamics, for populations that grow exponentially between transfers and f...
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ژورنال
عنوان ژورنال: Molecular Biology and Evolution
سال: 2000
ISSN: 1537-1719,0737-4038
DOI: 10.1093/oxfordjournals.molbev.a026233