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Within-group vigilance in red colobus and redtail monkeys.

A Treves1

  • 1Department of Psychology, University of Wisconsin, Madison, USA. atreves@facstaff.wisc.edu

American Journal of Primatology
|May 20, 1999
PubMed
Summary
This summary is machine-generated.

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Animal vigilance does not decrease in larger groups as expected. This study found no link between group size and vigilance in monkeys, suggesting other factors influence their behavior.

Area of Science:

  • Behavioral Ecology
  • Primatology
  • Animal Behavior

Background:

  • Theoretical models predict reduced vigilance in larger animal groups due to increased safety.
  • Previous studies on primates have not supported this theory, showing no decrease in vigilance with increasing group size.
  • An increase in vigilance related to social interactions, such as surveillance of associates, may mask reduced anti-predator vigilance.

Purpose of the Study:

  • To investigate the relationship between group size and within-group surveillance in wild red colobus and redtail monkeys.
  • To determine if increased social interactions in larger groups affect vigilance patterns.
  • To test the hypothesis that primate vigilance is unresponsive to group size.

Main Methods:

  • Analysis of observational data on glances toward associates in wild red colobus and redtail monkeys in Uganda.

Related Experiment Videos

  • Quantification of within-group surveillance based on frequency of glances.
  • Statistical analysis to assess the effect of group size on surveillance, considering factors like mating periods and infant care.

    • Main Results:

    • No significant effect of group size on within-group surveillance was detected in either red colobus or redtail monkeys.
    • Vigilance patterns were influenced by reproductive strategies, with males showing increased surveillance during mating and females when infants were young or out of contact.
    • These findings align with previous research indicating primate vigilance is largely unresponsive to group size.

    Conclusions:

    • Primate vigilance patterns are primarily driven by reproductive strategies rather than group size.
    • The expected decrease in vigilance with increasing group size is not observed in these monkey species.
    • Future research may require more complex models that consider fine-scale association patterns within groups to fully understand primate vigilance.