Coital rates, sex-selective infanticide, and sex ratios at birth: a reply to James

Article Abstract:

William James' article regarding the influence of systematic sex-specific infanticide on secondary sex ratios in Micronesia is invalid due to the absence of proof that the natives of Butaritari or Guam actually practiced systematic infanticide. On the other hand, historical evidence shows that infanticide and favoritism were not widely practiced in the area. Contrary to James' arguments, secondary sex ratio is not used as an a priori evidence of high coital rates.

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Coital rates, sex-selective infanticide, and sex ratios at birth

Article Abstract:

The study made by Jane Underwood and Alexandra Brewis regarding the relationship between high coital rates and high sex ratios at birth in Micronesia is questionable for various reasons. First, the unusually high coital rates in the country compared with other nations may indicate the existence of causes other than high sex ratios. Moreover, doubts still exist regarding the extent of the total Lexis variance.

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Martin's treatment of the human sex ratio at birth

Article Abstract:

This author reexamines John F. Martin's 1994 study of the sex ratio and birth order of the Havasupai Indians of northwestern Arizona. Excerpts from the original report, limitations of the conclusions, and other possible theories are examined.

Sexual behavior, Statistics, Surveys, Childbirth, Delivery (Childbirth), Sex ratio, Birth order, Havasupais

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