La nouvelle démographie de l'évolution
Langaney André. ? The New Demography of the Evolution. Numerous recent data reject neo-darwinian views about speciation and gradual evolution of species. Cytogenetics, demography and population genetics lend support to "punctuated-equili- brium" models in which species are stable and emerge quickly. In such models, reproductive isolation preceeds genetic divergence and a quick stabilization. At any level and in all species, demographic conditions (population size, fertility, mortality, spatial distribution,...) determine the evolutionary mechanisms. Human lineage divergence was very late (about 5 million years) and différenciation between apes and hominids is artificial. It is probable that human evolution has taken place in a single species for 1,8 million years. Present human biological diversity is likely to have begin 150 000 years ago. It does not fit visible physical differences which come from local and very recent adaptations.
Year of publication: |
1984
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Authors: | Langaney, André |
Published in: |
Population (french edition). - Institut National d'Études Démographiques (INED). - Vol. 39.1984, 3, p. 587-606
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Publisher: |
Institut National d'Études Démographiques (INED) |
Saved in:
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