Seasonality of birth in nineteenth and twentieth century Austria: steps toward a unified theory of human reproductive seasonality

Abstract

We present an analysis of birth seasonality in nine geographical regions within Austria for two time periods, 1881-1912 and 1947-1959.In the early period, geography, climate, and agricultural patterns were related to birth seasonality.By the later time period, these factors were no longer related to birth seasonality.We propose a "resilience hypothesis," which suggests two levels of causal influences on birth seasonality.First, underlying the three significant features of birth seasonality patterns around the world are only a small number of major causes.But, second, there are a multiplicity of minor causes that result in small perturbations in the patterns.

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