Evidence for evolution in response to natural selection in a contemporary human population.
Proc Natl Acad Sci U S A
; 108(41): 17040-5, 2011 Oct 11.
Article
en En
| MEDLINE
| ID: mdl-21969551
ABSTRACT
It is often claimed that modern humans have stopped evolving because cultural and technological advancements have annihilated natural selection. In contrast, recent studies show that selection can be strong in contemporary populations. However, detecting a response to selection is particularly challenging; previous evidence from wild animals has been criticized for both applying anticonservative statistical tests and failing to consider random genetic drift. Here we study life-history variation in an insular preindustrial French-Canadian population and apply a recently proposed conservative approach to testing microevolutionary responses to selection. As reported for other such societies, natural selection favored an earlier age at first reproduction (AFR) among women. AFR was also highly heritable and genetically correlated to fitness, predicting a microevolutionary change toward earlier reproduction. In agreement with this prediction, AFR declined from about 26-22 y over a 140-y period. Crucially, we uncovered a substantial change in the breeding values for this trait, indicating that the change in AFR largely occurred at the genetic level. Moreover, the genetic trend was higher than expected under the effect of random genetic drift alone. Our results show that microevolution can be detectable over relatively few generations in humans and underscore the need for studies of human demography and reproductive ecology to consider the role of evolutionary processes.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Reproducción
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Selección Genética
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Evolución Molecular
Tipo de estudio:
Prognostic_studies
Límite:
Adolescent
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Adult
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Child
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Child, preschool
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Female
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Humans
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Infant
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Male
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Newborn
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Pregnancy
País/Región como asunto:
America do norte
Idioma:
En
Revista:
Proc Natl Acad Sci U S A
Año:
2011
Tipo del documento:
Article