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A STUDY USING DEMOGRAPHIC DATA OF GENETIC DRIFT AND NATURAL SELECTION IN AN ISOLATED MEDITERRANEAN COMMUNITY: BAYÁRCAL (LA ALPUJARRA, SOUTH-EAST SPAIN)

Published online by Cambridge University Press:  10 February 2011

F. LUNA ,
A. R. TARELHO ,
A. M. CAMARGO  and
V. ALONSO
F. LUNA
Affiliation:
Departamento de Zoología y Antropología Física, Universidad Complutense de Madrid, Madrid, Spain
A. R. TARELHO
Affiliation:
Departamento de Biologia Animal, Universidade de Lisboa, Lisbon, Portugal
A. M. CAMARGO
Affiliation:
Departamento de Zoología y Antropología Física, Universidad Complutense de Madrid, Madrid, Spain
V. ALONSO
Affiliation:
Departamento de Zoología y Antropología Física, Universidad Complutense de Madrid, Madrid, Spain Instituto de Salud Carlos III and CIBERER, Madrid, Spain
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Summary

Natural selection and genetic drift are two evolutionary mechanisms that can be analysed in human populations using their fertility and mortality patterns, and their reproductive size and isolation, respectively. This paper analyses the models of natural selection and genetic drift in Bayárcal, south-east Spain, and compares them with the observed models in the rest of the Alpujarran region. Demographic data were obtained from a sample of 77 families (48.45% of the population, with 547 inhabitants). The genetic drift and natural selection action was evaluated with the Coefficient of Breeding Isolation (CBI of Lasker and Kaplan) and Crow's index, respectively. The CBI (23.23/12.61) suggests that genetic drift is near to acting, and Crow's index (I=0.58) is slightly higher than that observed in the rest of La Alpujarra. Although the reproductive isolation of Bayárcal is not effective enough for genetic drift to act, it is near when marital migrants inside the Bayárcal valley are considered as a native population. The natural selection pattern is not different from that of the rest of La Alpujarra, but it tends towards the model of developing communities, where the demographic transition has not yet begun.

Type
Research Article
Information
Journal of Biosocial Science , Volume 43 , Issue 4 , July 2011 , pp. 401 - 411
Copyright
Copyright © Cambridge University Press 2011

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