They also serve: Chamorro male fertility in the pre-world war ii period.

Male fertility, a generally overlooked aspect in studies of human reproductive patterns, is examined from the reproductive life histories of Chamorro males with essential completed fertility by 1941. Males in this "natural fertility" indigenous population of the Pacific island of Guam exhibit low levels of couple infertility which are counteracted by high levels of adult male mortality, while new unions formed after the death of female partners tend to reduce completed fertility by only about one child. Delayed age at the time of union formation is largely compensated by reduction in birthspacing intervals among offspring of older fathers.

Maternal/offspring birth month concordance in a Pacific island population.

Analyses of 13,863 births occurring on Guam before 1942 reveal statistically significant concordance of maternal and offspring birth months, accounting for over 17% of recorded births. A secular change by maternal birth year in month of highest concordance level coincides with changing public health measures over this historical period. Together with observed birth order effects, showing decreasing concordance values with increasing birth order rank, these findings suggest an immunological component of observed birth seasonality patterns.

Sex ratio of livebirths in Micronesia.

A growing body of data extends Hunt's earlier findings from Yap to suggest a characteristic Micronesian pattern of highly masculinized secondary sex ratios. Using materials from an extensive family record register for pre-World War II Guam, it is now possible to examine parental age and birth order effects in a Micronesian population in which the overall sex ratio of livebirths to 3,406 formally wed and fertile couples was 109.6.