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The authors examine differences in occupational performance levels between men and women in Venezuela labor unions. Dissimilarities in perceptual speed and accuracy, task related abilities, and psycho-physiological characteristics are examined.

An evaluation of the fertility distribution of the adult population in Venezuela showed males and females exhibiting different fertility characteristics. There was a greater male/female ratio among the Yanomami, and fertility was higher in males than in females. Higher offspring count was greater in females than males. Females of the low-fertility group had more mates than the males, but the opposite occurred in high-fertility groups.

This study evaluates the impact of the Trivers‐Willard (T‐W) effect on human populations, using demographic data collected from vital registration data in Venezuela. The evaluation of the sex ratio at birth (SRB) and of fetal and infant deaths supports the existence of T‐W effect in the Venezuelan population in extreme conditions. This T‐W effect was observable in the SRB but not at later ages and is related to the marital status of the mother. The results indicate that the investment in females associated with environmental adversity is greater than the investment in males associated with good environmental conditions. [ABSTRACT FROM PUBLISHER]