منابع مشابه
Population 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 کاملPopulation bottlenecks in quasispecies dynamics.
The characteristics of natural populations result from different stochastic and deterministic processes that include reproduction with error, selection, and genetic drift. In particular, population fluctuations constitute a stochastic process that may play a very relevant role in shaping the structure of populations. For example, it is expected that small asexual populations will accumulate mut...
متن کاملPopulation Bottlenecks Promote Cooperation in Bacterial Biofilms
Population bottlenecks are assumed to play a key role in the maintenance of social traits in microbes. Ecological parameters such as colonisation or disturbances can favour cooperation through causing population bottlenecks that enhance genetic structuring (relatedness). However, the size of the population bottleneck is likely to play a crucial role in determining the success of cooperation. Re...
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 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...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2001
ISSN: 0960-9822
DOI: 10.1016/s0960-9822(01)00608-x