Siberian live birth sex ratios and the SPrOO hypothesis

Melnikov and Grech found a highly significant seasonal pattern of the sex ratio (SR) at birth in western Siberia, namely, a peak in the second and a trough in the fourth quarter of the year. 1 This peak and trough are in line with the seasonal preovulatory overripeness ovopathy (SPrOO) hypothesis, w...

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Bibliographic Details
Published in:Journal of epidemiology and community health (1979) 2004-06, Vol.58 (6), p.528-528
Main Author: Jongbloet, P H
Format: Article
Language:English
Subjects:
Birth Rate - trends
Female
Humans
Hypotheses
Letter
Letters
Male
ovopathy
Pregnancy
Russia
seasonality
Seasons
Sex Ratio
Socioeconomic factors
Socioeconomics
Vivipary
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Summary:Melnikov and Grech found a highly significant seasonal pattern of the sex ratio (SR) at birth in western Siberia, namely, a peak in the second and a trough in the fourth quarter of the year. 1 This peak and trough are in line with the seasonal preovulatory overripeness ovopathy (SPrOO) hypothesis, which states (1) an approach to gender equity at the peak of the "ovulatory" seasons, (2) preferential fertilisation of non-optimally matured oocytes by Y-bearing sperm during the transitional stages between them, and (3) SR reversal because of excess of male biased fetal loss during the "anovulatory" seasons. 2 The mentioned peak would correspond, just like in non-human mammals with the breakdown of the "ovulatory" season in spring; the trough with SR reversal during the "anovulatory" season in winter.
ISSN:0143-005X
1470-2738