Cookies Policy

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies.

I accept this policy

Find out more here

Social Stress and the Sex Ratio of Neonates and Infants Among Non-Human Primates

No metrics data to plot.
The attempt to load metrics for this article has failed.
The attempt to plot a graph for these metrics has failed.
The full text of this article is not currently available.

Brill’s MyBook program is exclusively available on BrillOnline Books and Journals. Students and scholars affiliated with an institution that has purchased a Brill E-Book on the BrillOnline platform automatically have access to the MyBook option for the title(s) acquired by the Library. Brill MyBook is a print-on-demand paperback copy which is sold at a favorably uniform low price.

Access this article

+ Tax (if applicable)
Add to Favorites
You must be logged in to use this functionality

image of Netherlands Journal of Zoology
For more content, see Archives Néerlandaises de Zoologie (Vol 1-17) and Animal Biology (Vol 53 and onwards).

Recently, several theories have been put forward to account for deviations from unity in birth sex ratios among non-human primates. These theories propose benefits to the mother of adjusting the sex ratio of her offspring. Social stress has been suggested to provide the physiological mechanism for this adjustment. A review of sex ratios at birth and among infants in non-human primates indicates that high levels of social stress lead to both reduced female proportions at birth and increased female mortality after birth. In combination with behavioural observations showing that young females are more heavily attacked by conspecifics both before and after birth, these results suggest that the sex ratio adjustment is caused by the disruptive actions of conspecifics and is not the result of an adaptive adjustment by the mother. This implies that the theories proposed so far to explain this phenomenon are inadequate. A new hypothesis is presented, referred to as enforced density-dependent sex ratio change. It is adaptive for females to try to curtail the production of daughters by other females, because female fecundity in primate groups is negatively correlated with group size.

Affiliations: 1: Laboratory of Comparative Physiology, State University of Utrecht, Jan van Galenstraat 40, 3572 LA Utrecht, The Netherlands)


Full text loading...


Data & Media loading...

Article metrics loading...



Can't access your account?
  • Tools

  • Add to Favorites
  • Printable version
  • Email this page
  • Subscribe to ToC alert
  • Get permissions
  • Recommend to your library

    You must fill out fields marked with: *

    Librarian details
    Your details
    Why are you recommending this title?
    Select reason:
    Netherlands Journal of Zoology — Recommend this title to your library
  • Export citations
  • Key

  • Full access
  • Open Access
  • Partial/No accessInformation