Seasonality of birth in Nineteenth and Twentieth Century Austria
Doblhammer, G., Rodgers, J. C., Rau, R.
Social Biology, 47:3-4, 201–217 (2000)
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 these otherwise resilient and consistent patterns. (SOCIAL BIOLOGY)