Abstract

ALBEZA, MARÍA VIRGINIA; ACRECHE, NOEMÍ ESTELA  and  CARUSO, GRACIELA BEATRIZ. BIODEMOGRAPHY OF PUNA POPULATIONS ((CHAÑARCITO, SANTA ROSA  DE LOS PASTOS GRANDES AND OLACAPATO) SALTA, ARGENTINA. Chungará (Arica) [online]. 2002, vol.34, n.1, pp.101-117. ISSN 0717-7356.  http://dx.doi.org/10.4067/S0717-73562002000100007.

Genetic drift, natural selection and gene flow were analyzed by demographic parameters and were found to affect the genetic structure of populations through sampling error, immigration of the reproductive fraction and opportunity for natural selection respectively. The three small villages studied: Chañarcito, Santa Rosa de los Pastos Grandes and Olacapato, belong to the Los Andes department in the Salta Province. There exists a high probability of fixation by drift in Santa Rosa and Olacapato, lower but important in Chañarcito. Genetic drift is an active factor in the three villages. The Endogamy Coefficient F is high duet to the small size and high isolation of the three small villages. The highest Opportunity Index for the Natural Selection (I) estimated was in Chañarcito (0.443). In Santa Rosa de los Pastos Grandes and Olacapato, I was 0.434 and 0.305 respectively. I_f / p_s in Chañarcito is 0.32, and 72.23% of the total Index; while the value in Santa Rosa is 0.35, 80.64% and 0.20 (65.57%) for Olacapato, which indicate that Selection is acting through the fecundity fraction

Keywords : Biodemography; puna's populations; effective population size; effective migration; reproductive isolation coefficient; endogamy coefficient; opportunity for selection.

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