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Related Experiment Videos

Birth spacing patterns in humans and apes.

B M Galdikas1, J W Wood

  • 1Orangutan Research and Conservation Project, Department of Archaeology, Simon Fraser University.

American Journal of Physical Anthropology
|October 1, 1990
PubMed
Summary

This study introduces a survival analysis to accurately estimate primate birth intervals, accounting for censored data and offspring mortality. Orangutans have the longest median birth interval, followed by chimpanzees, gorillas, and humans.

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Area of Science:

  • Primate Ecology and Behavior
  • Human Evolutionary Biology
  • Demography and Biostatistics

Background:

  • Comparative studies of primate birth intervals face analytical challenges including right-censored data, small sample sizes, non-normal distributions, and confounding effects of early offspring mortality.
  • Life history differences, such as menopause, further complicate the interpretation of birth interval dynamics across species.

Purpose of the Study:

  • To apply a robust survival analysis method to minimize common problems in estimating birth intervals in wild primates and humans.
  • To compare birth interval lengths across different primate species and a human population using consistent analytical techniques.

Main Methods:

  • A survival analysis model was employed to address issues of data censoring, sample size, and offspring mortality.

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  • The analysis utilized published data for wild chimpanzees (Gombe) and gorillas (Virunga), alongside new data for wild orangutans (Tanjung Puting) and the Gainj people of Papua New Guinea.

    • Main Results:

    • Estimated median birth intervals, excluding cases of early offspring death, were calculated for four populations.
    • Orangutans exhibited the longest median birth interval (92.6 ± 2.4 months), followed by chimpanzees (66.6 ± 1.3 months), gorillas (45.5 ± 1.2 months), and the Gainj humans (43.3 ± 1.0 months).

    Conclusions:

    • The applied survival analysis provides a more reliable method for comparing birth intervals across species with varying life histories and data limitations.
    • Significant differences in median birth intervals exist among orangutans, chimpanzees, gorillas, and humans, highlighting species-specific reproductive strategies.