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Our sample is not large enough to split the data by both sex ratio and income quartiles at once and still precisely estimate the model.
Such fears about sex ratios in cases of mass migration extends beyond the immediate consequences.
Communities with adverse sex ratio endorse polyandry, abduction and coercive repetitive pregnancy for male children which in turn adversely affect women's health and worsen the economic condition of poor families.
If the 50:50 sex ratio is an unbeatable evolutionary trap, why are there non-50:50 sex ratios in nature?
The data of the recent study show a strictly male biased sex ratio in the offspring of edible dormice throughout all study years.
Indeed, it is those similar characteristics that these nations share that caused the need for this study because Nigeria has suddenly deviated from the norm of having a sex ratio at birth of 1.03 to 1.06.
The divide between the north and south has got even starker with the child sex ratio in 2011.
[5.] Argasinski K (2013) The dynamics of sex ratio evolution: from the gene perspective to multilevel selection.
Conclusion: In this particular population, two measures of less affluent SES were associated with higher sex ratio at live birth.
According to census data, the child sex ratio (0-6 years) in India was 927 girls per 1,000 boys in 2001, which dropped drastically to 918 girls for every 1,000 boys in 2011.
Spatial and temporal variations in sex ratio are common in many bird species because of differences in mortality, migration distance, migration time, and the likelihood of being shot between males and females (Owen and Dix, 1986; Donald, 2007; Sun et al., 2011; Liker et al., 2014; Shao et al., 2016).
Even in this case, our model predicts that the increase in saving rate of men and their parents from the sex ratio imbalance would tend to outweigh any reduction in saving by women or their parents, due to men's combination of the competition motive and the desire to smooth consumption in anticipation of marrying a spouse who has saved less.