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Opportunity for Natural Selection in a Basque Population and Its Secular Trend: Evolutionary Implications of Epidemic Mortality

Abstract

Analysis of the interaction between mortality patterns and opportunity for natural selection could help to elucidate potential evolutionary implications of epidemic mortality. In this paper secular trends are studied in relation to Crow's index (I^sub t^) and its components of mortality (I^sub m^) and fertility (I^sub f^), using parish records for family reconstitution in a Basque population. A principal components analysis (91% of the variance accounted for) showed marked quantitative and qualitative variations of I^sub m^ and I^sub f^ depending on the stage of demographic transition of the population analyzed: In pretransitional societies the opportunity for natural selection is ...

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