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CONSANGUINITY ON ROBINSON CRUSOE ISLAND, AN ISOLATED CHILEAN POPULATION

Published online by Cambridge University Press:  12 August 2013

PIA VILLANUEVA ,
MARIA A. FERNÁNDEZ ,
ZULEMA DE BARBIERI  and
HERNÁN PALOMINO
PIA VILLANUEVA*
Affiliation:
Institute of Biomedical Sciences, University of Chile, Santiago, Chile Department of Pediatric Dentistry and Dentomaxillary Orthopedics, University of Chile, Santiago, Chile School of Speech and Hearing Sciences, University of Chile, Santiago, Chile Doctoral Program of Psychology, Graduate School, University of Granada, Spain
MARIA A. FERNÁNDEZ
Affiliation:
School of Speech and Hearing Sciences, University of Chile, Santiago, Chile
ZULEMA DE BARBIERI
Affiliation:
School of Speech and Hearing Sciences, University of Chile, Santiago, Chile
HERNÁN PALOMINO
Affiliation:
Institute of Biomedical Sciences, University of Chile, Santiago, Chile
*
1Corresponding author. Email: piavilla@u.uchile.cl
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Summary

The population of Robinson Crusoe Island is estimated at 633 inhabitants. The current population has a common origin from the first eight families who colonized the island at the end of the 19th century. The objective of this study was to determine the rates of consanguinity, the average coefficients of inbreeding, the types of consanguineous marriages and the inbreeding evolution between 1900 and 2000 on the island. All marriages registered on the island, from the last colonization until 2000 (417 in total), were included in the analysis. In addition, extended genealogies were obtained. The consanguinity rate was 14.9% and the average coefficient of inbreeding (α) 54.05×10–4. The most frequent type of consanguineous marriages was between second cousins, followed by first cousins. The average value of the first/second cousin ratio was 1.11. The population of Robinson Crusoe Island has a high rate of inbreeding. The unique characteristic of the island – its small current population, originating from just a few families, with small rate of gene flow – could explain the observed high and increasing consanguinity.

Type
Articles
Information
Journal of Biosocial Science , Volume 46 , Issue 4 , July 2014 , pp. 546 - 555
Copyright
Copyright © Cambridge University Press 2013 

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